Surge arrester for 1-Wire Professional bus master - 5000 amps (Type 2)


Surge arrester for 1-Wire Professional bus master - 5000 amps (Type 2)

Item number 451

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Newly designed protection element for overvoltages and overcurrents with three protection levels. The protective cascade combines a high discharge capacity with a short response time and ultra-fast current limiting, resulting in an outstanding protective effect.

NEW!  Surge arrester and overcurrent protection in one module, certified for 5,000 amps (pulse class C2, tested at 10,000 V)
NEW!  Clamping voltage only 10 V on the device side (after 1 µs)
NEW!  Combination of three stages with a total of 24 protection and flashover paths

NEW!  PE connection with very low contact resistance for uncut and low-impedance 2.5 mm² connection
NEW!  Including two sets of terminals blue, grey and orange for three-pole connection of 1-Wire (5V, GND, DATA)
NEW!  Now also available as SparPack or SuperSparPack with addition (one piece for five pieces or two pieces for 10 pieces)

This lightning protection module is designed for 1-Wire bus systems with the ElabNET Professional Busmaster or for protecting the 1-Wire channels of the Timberwolf servers, models 350Q, 950Q and 960Q.

For 1-Wire bus systems with other bus masters (e.g. Maxim DS9490R, Loxone 1-Wire Extension), we offer a separate protection module optimised for these bus masters that also contains a bus boost stage for increasing the range (this is already included in the PBM).



  • Design: Module with open REG housing
  • Mounting on DIN rail: Fully assembled with base for DIN rail
  • Terminals: Two times three terminals blue, grey and orange for three-pole 1-wire connection
  • PE connection: Pre-assembled with washers, lock washer, nut and crimp connector for 2.5 mm².
  • Quantity according to order, please also note our SparPacks and SuperSparpack



  • Three-stage surge arrester including overcurrent protection for protecting the 1-wire installation in connection with Professional Busmaster or Timberwolf Server of the models 350Q, 950Q and 960Q
  • Combination of short response time, high discharge capacity and fast current limitation
  • Short response time of the entire module of less than 40 ps
  • A total of 24 protective paths, consisting of six bidirectional flashover paths plus 15 protective paths via diodes plus three protective paths via current limiters
  • High discharge capacity and low dynamic resistance due to parallel-acting protective gaps
  • Low-impedance PE connection for uncut connection for lightning current equipotential bonding with 2.5 mm².
  • Protection level on the bus side between 1-Wire Data against GND:  527 V (for pulse class C2), 10,000 V (1.2/50 us) / 5,000 A (8/20 us) - on the unit side, however, only for 1 µs, thereafter terminal voltage 10 V
  • Protection level on the bus side between 5 volts against GND:  527 V (for pulse class C2,  10,000 V (1.2/50 us) / 5,000 A (8/20 us) - on the unit side, however, only for 1 µs, afterwards terminal voltage 10 V
  • Due to the combination of short response time, low protection level and fast current limitation, this protective element minimises the load on the protected 1-wire bus masters, devices and the insulation on the device side to practically zero.
  • This surge arrester for information technology systems has been certified according to IEC 61643-21-2001 + A1:2009 test C2 for "fast rising edge" and corresponds to arrester type 2.
  • Made in Germany

Intended use / scope of application / intended use:

This 1-wire surge arrester of category C2 / Type 2 according to IEC 61643-21 is intended for installation in distribution cabinets and junction boxes in dry residential and business premises, control cabinets in industry and automation systems. It serves as a surge arrester between electrical conductors of the 1-wire bus system and the equipotential bonding rail in case of direct and near lightning strikes as well as overvoltages from switching operations and discharges the partial lightning current into the earthing system. We recommend the combination with a surge arrester for power supply systems Type 1 and Type 2 and the use of several of these 1-Wire BlitzART modules in the 1-Wire system.

This module is designed for 1-Wire bus systems with the ElabNET Professional Busmaster or with the Timberwolf Server of the models 350Q, 950Q and 960Q.

  • Surge protection device as part of the internal lightning protection for 1-Wire bus systems
  • Arrester for overvoltages from galvanic, inductive and capacitive coupling as a result of close lightning strikes (atmospheric overvoltage)
  • Arresters for overvoltages due to remote lightning strikes (e.g. in transmission networks)
  • Arresters for overvoltages due to switching operations in low, medium and high voltage networks (switching overvoltage)
  • Self-resetting, fast-acting overcurrent protection device, thus protection also against low overvoltages (e.g. 12 V on the bus-side connections in the event of incorrect wiring)

Note: This module has three protective effects, which differ depending on the connection side. The power stage acts on the bus side of the module and can equalise or dissipate 5,000 amps. Both connection sides are connected via a three-pole overcurrent protection stage. The downstream fast fine stage initially acts on both connection sides at the onset of an overvoltage event; as soon as the overcurrent protection stage is activated, the current flow between the two sides is limited so that the voltage equalisation of the fine stage only has an effect on the device side (as long as the event lasts) and reduces the terminal voltage there again.

  • Bus side: After all three protection stages have tripped, the gas voltage arresters act on the bus side and equalise up to 5,000 amperes
  • Device side: After all three protection stages have tripped, the overcurrent protection reduces the current flow between the two sides to 50 or 200 mA per path, and the fine stage on the device side reduces the protection voltage to 10 V.

Note: For 1-Wire bus systems with other bus masters (e.g. Maxim DS9490R, Loxone 1-Wire Extension) we offer a protection module optimised for this purpose with included BusBoost and bandpass for optimum range.

Recommendations for design / connection:

  • Due to the different protective character of the two module connections (bus side vs. device side), we recommend connecting the long part of the bus installation on the bus side and the short part - especially for the protection of Professional Busmaster and Server - on the device side of the module.
  • The bus can be protected with several such modules. In this case, only the bus side is to be connected and the 1-Wire bus is to be routed past the module (short branches with 1-Wire devices on the device side may be connected).
  • For very long buses, we recommend one such module every 100 m. Here, too, the module is to be connected only with the bus side facing the 1-Wire bus cabling.


  • 1-Wire: This module is compatible with 1-Wire bus systems and 1-Wire devices / slaves.
  • Professional Busmaster: This module is specially optimised for the higher supported currents of the Professional Busmaster via 5 V / GND.
  • Timberwolf Server: This module is specially optimised for the higher supported currents of the PBM integrated in the 350Q, 950Q and 960Q models.

Note for Loxone and other bus masters: For other 1-Wire bus masters such as Maxim DS9490R as well as Loxone 1-Wire Extension, we recommend the separately available 1-Wire BlitzART protection module, which includes a bandpass filter and a BusBoost stage for improved range on the 1-Wire bus in addition to a tighter current limit.

The capacitive load of the data line of the 1-Wire bus (DATA) by this surge arrester is a few picofarads, which corresponds to the capacitive loading of less than 1 m of bus line.


  • What is the function of the BlitzART 1-Wire PBM surge arrester?
    The BlitzART 1-Wire surge arrester for PBM reduces the consequences of a near and far lightning strike by means of rapid equalisation between all connected cores with the lightning current potential equalisation and an almost complete interruption of the current flow between the bus and the device side of the module. This equalisation and blocking reduces voltages and thus protects components and insulation of the 1-Wire devices and the 1-Wire bus lines.
  • Reduced means "not complete"?
    No system in the world can offer 100% safety. However, depending on the design, it is possible to significantly reduce the probabilities of damage caused by lightning. This BlitzART 1-Wire PBM surge arrester, with its short response time and low protection level, is able to provide the best available level of protection for 1-Wire systems. Especially when these arresters are installed at several points in the system. On the device side of the module, the overvoltage is practically completely eliminated. Even with an overvoltage of 10,000 V and 5,000 A (8/20 µs) on the bus side, the protective voltage on the device side is only 10 V at a few mA after 1 µs. This rules out any damage to the 1-wire components on the device side of the module.
    For maximum effectiveness of the arresters, we recommend supplementing the low-voltage part of the system with arresters for power systems type 1 and type 2 (or combination arresters type 1/2). Please consult a specialist company for advice.
  • What are the planning and installation recommendations for the best protection?
    Please plan one or more modules per 1-wire bus, depending on the scope of the bus system.

    Install one module in direct spatial proximity to the protection of the 1-Wire Professional bus master or the Timberwolf Server models in which this bus master is integrated. Loop the connections of the 1-Wire channels directly via the device side of the module to the 1-Wire bus (which you connect to the bus side).

    If the bus is longer (more than 50 m), we recommend installing another module in the middle of the bus. In this case, only connect the 1-wire bus to the bus side of this module. You can either connect a branch with 1-Wire devices to the device side or leave this connection unassigned.

    With very long 1-Wire buses, install another module every 50 m.

    Most important recommended additional measure: Have internal lightning protection (type 1 and type 2 arresters) for energy-technical networks installed on the low-voltage side.

  • The 1-Wire is galvanically separated from everything else as a SELV system and the lines are shielded. How can an overvoltage, a lightning strike destroy this?
    Nothing is perfect, not even foil shields. Therefore, capacitive and inductive coupling of the lightning energy is possible in principle. Moreover, although the insulations are designed for 4,000 V, lightning generates voltages of up to several hundred thousand volts. Therefore, all insulations are at risk, especially in close proximity / contact with PE, neutral and all outer conductors. We recommend separate routing of all lines of information technology systems, as well as signal and bus lines of power supply lines. Separate metallic and closed cable trays or ducts for cable routing would be ideal.

    There is a danger in the case of applied shielding (this is generally not recommended, but may be useful in individual cases for interference suppression). In the event of a nearby lightning strike, the lightning voltage is conducted through the foundation earth electrode into the house and thus to the PE of the entire building. This stresses the insulation within the bus lines. This 1-Wire PBM surge arrester has a low-impedance PE connection and compensates for potential differences. Please connect the PE connection of the protection modules to the same PE terminal block to which the shielding is connected. From this terminal block, a length of at least 2 m should be maintained to the PAS (so that purely in terms of time a type 2 arrester can switch through first).
  • What endangers the insulation?
    A lightning strike means a discharge between cloud and earth via an air gap that is conductive for a short time. Starting from the lightning channel as a current-carrying conductor, an electric field and a magnetic field are generated around it. These fields couple capacitively and inductively into conductors and conductor loops and change the potentials in all metallic conductors throughout the building. The nearby earth can only absorb part of the lightning energy. About half of the energy is conducted into the building through the foundation earth electrode via PE. Thus, in the event of a nearby lightning strike, the equipotential bonding rail and thus the entire PE via the foundation earth electrode is under a very high voltage potential of several tens of thousands of volts. These potential differences want to equalise with each other and with the distant earth in the transformer station accessible via the mains connection (and, depending on the type of mains, also with the earth of the neighbouring buildings). In order to be able to take this path, the lightning voltage also tries to pass through the insulations (depending on the network form) to the neutral and outer conductors.
  • How does this BlitzART surge arrester protect?
    The different potentials that form in metallic conductors when lightning strikes close by want to balance each other out. The equalisation takes the path of least resistance. The BlitzART 1-Wire PBM arrester offers the surge voltage a simple path by creating a massive short-circuit almost immediately in the event of a sudden voltage increase, via which the potentials can balance each other out. The BlitzART 1-Wire PBM surge arrester involves the three connected 1-Wire cores and PE and creates a short circuit between all four connections. This provides immediate and low-impedance compensation for the overvoltage, so that potential differences are considerably reduced and insulation and components are thus protected.
    Such an overvoltage event is already completed after twenty millionths of a second in this area of the cabling. During this short time, the components convert several thousand W of heat. A lightning bolt has an average energy of 280 kWh, about one tenth of which is converted on the ground and in the installations. When the event is completed, the components of the BlitzART protection module automatically switch back to the non-activated state.
  • Why are there 24 switching, protection and flashover paths in this BlitzART 1-Wire PBM surge arrester?
    Each component for surge protection has its own characteristics in terms of reaction time, voltage limitation, tripping voltage, maximum voltage, discharge capacity, heat absorption, leakage current, capacitance and polarity. There is no component that leads in each of these characteristics, often one of the parameters is very pronounced, while others are less intense. So that we did not have to make a compromise with this BlitzART surge arrester, we combined several components with a total of 24 protection and surge paths in a three-stage cascade in such a way that components with the shortest possible reaction time complement each other with components with high discharge capacity. In this way, we achieve a level of protection that was previously impossible.
  • I have taken the board out of the module. On the bottom of the board I see nine component pins that are not soldered. Was something forgotten here?
    No, these nine pins belong to the high-current PE connection. Over the four edges of each of the nine pins, the component is homogeneously cold-welded to the through-platings of the board by an interference fit in the factory at a total of 36 connection points. This connection technology is mechanically very stable (pull-out force 900 N), has very low resistance (less than 200 µOhm), is permanently gas-tight and can carry high currents (500 amperes permanently). With this - and in combination with the crimp cable lug for uncut PE connection with high cross-section - we achieve a particularly low-impedance PE connection.
  • Are there any tips for the connection to PE?
  1. Same PE terminal blocks: If a surge arrester protects equipment that itself has a mains voltage connection with a protective earth conductor (for example, a power supply unit for supplying PBMs and/or servers), then the PE connection of the surge arrester should be the same.If the PE connection of the surge arrester is routed to the equipotential bonding with the same or a lower impedance than the connection of the protective earth conductor of the device to be protected to the equipotential bonding. We therefore recommend routing the PE connection of the surge arrester by the shortest route to the same PE terminal block to which the protective earth conductor of the power supply unit to be protected is connected (if it is such a power supply unit).
    The same applies if the shield of the bus cabling (usually not recommended, but may be useful in part for interference suppression) has been connected to PE. In this case, the PE of the surge arrester should be connected to the same PE terminal block to which the shield was connected. Such shield connections should be tied over the entire shield circumference with special clamps, the often braided braids are electrically unfavourable for discharges of transient overvoltages).
  2. Proper working method: Please carry out the PE connection with the utmost care. Only crimp those classes of conductors with the correct cross-section that are approved for the crimping cable lug used in each case and only use the correct crimping pliers for this (if you use the crimping cable lug supplied. please refer to the technical data). Screw the nut on the connection tightly (observe the tightening torques in the technical data). Lay the cable along the shortest route to the PE terminal block and screw the cable properly there as well (observe the terminal manufacturer's specifications, especially regarding the use of wire-end ferrules and the cross-sections permitted for this terminal). Avoid forming a spatial loop in the building at all costs (to avoid induction in the event of a lightning strike) and never wrap the PE cable around anything (do not build a coil). It is important that these connections are mechanically strong, permanently gas-tight and have the best possible contact. Please remember, this must contact safely for decades. The design of the PE is safety-critical and must be done properly and correctly according to the applicable standards. Please leave this to an approved electrical installation company.
  • I have external lightning protection, do I then need this BlitzART surge arrester at all?
    Yes, absolutely. If external lightning protection ("lightning conductor") is present, additional internal lightning protection is always required (in accordance with the relevant standards). After all, the lightning is conducted from the lightning conductor directly via the foundation earth electrode into the building onto the equipotential bonding rail. From there, the overvoltage tries to pass through to all neighbouring metallic conductors with a lower potential. Only internal lightning protection prevents this by short-circuiting all metallic conductors together. This BlitzART surge arrester is an important component of such an internal lightning protection on level C2 / Type 2 and performs this task for the 1-Wire bus and PBM / Server. This is a supplement to the coarse and medium protection according to Type 1 and Type 2, which must also be installed by an expert for lightning protection systems.
  • Isn't surge protection built into the 1-Wire units?
    Not always. There is no room for surge protection in sleeve sensors and ceiling sensors, only our board-based products have surge protection diodes. However, these are not capable of carrying lightning current and have no connection to PE, so they can only compensate for transverse voltages, but not longitudinal voltages. This protects internal components, but not the insulation of the 1-wire bus cables. Other manufacturers and practically all Maker projects of 1-wire modules also do without surge protection diodes. This BlitzART surge arrester can dissipate about fifty times what the small protective diodes in devices can achieve (if present) - plus also against PE.
  • When does the BlitzART 1-Wire PBM surge arrester trigger?
    The fine stage starts to conduct from about 6 V, the gas voltage arresters ignite from about 150 V and a rate of voltage rise that is typical for overvoltage events with a correspondingly steep rising edge. The overcurrent limiters are effective from 50 or 200 mA (depending on the conductor).
  • Will a BlitzART surge arrester be destroyed by lightning?
    No, usually not, this module is capable of carrying lightning currents up to 5,000 amperes. If this should ever happen, please let us know, we will certainly find a very accommodating compensation.


Surge arrester type 2 for the Professional Busmaster (PBM) with three-stage protection system with disconnection of the current flow to the equipment side.

This surge arrester can discharge 5,000 amperes (8/20 µs, pulse category C2, fast rising edge). In addition, this protection system is equipped with the innovative ElabNET Current-Cut technology (self-resetting high-speed fuse 1µs). This enables additional protection even against low overvoltages (e.g. short circuit with 24 V due to wiring errors).

This BlitzART protection system is thus a combined protection system consisting of a very powerful type 2 surge arrester plus a very sensitive overcurrent protection (50 or 200 mA / 1 µs). The overcurrent protection switches off an overcurrent to the device side within one microsecond. The reset after the overcurrent event takes place automatically within one millisecond.

This short-circuits overvoltages, compensates potential differences and additionally separates remaining overcurrents. Due to this special combination, the achievable device protection is better compared to conventional protection systems without this third protection level.

Overview of the included protection technologies

  • Protection scope: Threesprotection of the connected devices and power supplies as well as the insulation of lines against overvoltage from near and far lightning strikes, against overvoltages from switching operations as well as protection between bus and device side against overcurrent already from 50 or 200 mA. This also limits equipotential bonding currents via bus and GND lines.
  • Total number of protective paths: 24 protective and flashover paths
  • Number of gas voltage arresters: Six flashover paths via two double-chamber gas voltage arresters (specified by the manufacturer with up to 20,000 amperes)
  • Number of diodes / TVS diodes: A total of 15 diode protection paths, including three parallel ultra-fast TVS protection diodes (response time of a few dozen picoseconds)
  • Number of current limiters: Three overcurrent protection sections with fast, self-resetting current limiters (limiting in 1 µs, resetting 1 ms)
  • Type of surge arrester: Type 2
  • Certified current discharge: 5,000 amps at 8/20 µs (increased current load according to pulse class C2, fast rising edge).
  • Low impedance PE connection: Cold-welded PE connection with low contact resistance, pre-assembled with washers, spring washer, nut and crimping cable lug for uncut connection to equipotential bonding up to 2.5 mm².
  • Overcurrent protection: Current-cut technology, based on three ultra-low, self-resetting current limiters in all three line paths, tripping at 50 / 200 mA within 1µs, limits the current flow between the bus and equipment side of the protection module and allows a protection level below 10 V on the equipment side of the module
  • Automatic reset: Restoration of the connection between bus and device side within 1 ms after the overvoltage or overcurrent event.
  • PE connection: Pre-assembled with washers, spring washer, nut and crimp cable lug (DIN 46234) for connection to equipotential bonding up to 2.5 mm².

Operating range

  • Rated voltage 1W against GND: 5 V
  • Highest continuous voltage 1W against GND: 6 V
  • Rated voltage 1W against GND: 5 V
  • Highest continuous voltage 5 V against GND: 6 V
  • Leakage current 1W to GND:  5 uA
  • Leakage current 5 V to GND:  5 uA
  • Insulation resistance at highest continuous voltage:1 MOhm
  • Capacitance 1-wire to GND: 60 pF

Protection level (for overvoltage 10,000 V and 5,000 Amps)

  • Data lines, 1W against GND: 527 V (at pulse class C2,  10,000 V (1.2/50 us) / 5,000 A (8/20 us) - but only for 1 µs on the unit side
  • Data lines, 5 V against GND: 555 V (for pulse class C2), 10,000 V (1.2/50 us) / 5,000 A (8/20 us) - but only for 1 µs on the unit side.
  • After current limitation: This protection level reduces to below 10 volts on the unit side after about 1 µs (due to current cut).
  • Pulse recovery, 1W against GND: <1.01 ms (measured at 2,000 V (1.2/50 us) / 1,000 A (8/20 us)
  • Pulse recovery, 5 V against GND: <1.07 ms (measured at 2,000 V (1.2/50 us) / 1,000 A (8/20 us)
  • Current limitation with current-cut GND line: 200 mA (between bus and unit side)
  • Current limitation with current-cut 5V line:200 mA (between bus and device side)
  • Current limitation with Current-Cut 1-Wire Data: 50 mA (between bus and device side).

Test standards and certification

  • Certification: According to EN 61643-21:2001 + A1:2009 + A2:2013: according to pulse class C2 at 10 kV (1.2/50 us) / 5 kA (8/20 us).
  • Test laboratory: DEHN Prüf- und Testzentrum, Neumarkt, accredited according to DIN EN ISO/IEC 17025:2018 by the German Accreditation Body DAkkS.

Connections Bus side

  • Bus: Triple plug-in terminal block Wago 243 with four connections per potential and test opening.
  • Permissible conductor class: solid conductor with diameter 0.6 - 0.8 mm (conductor class 1 according to DIN/IEC 60228)
  • Stripping length: 5-6 mm
  • Overvoltage protection:The overvoltage protection by short-circuiting acts against the bus side of the module or PE, the device side is additionally disconnected by the overcurrent protection.

Connections on the unit side

  • Bus: Triple plug-in terminal Wago 243 with four connections each per potential and test opening
  • Permissible conductor class: solid conductor with diameter 0.6 - 0.8 mm (conductor class 1 according to DIN/IEC 60228)
  • Stripping length: 5-6 mm
  • Overcurrent protection: The current-cut overcurrent protection limits the current on the three lines between the bus side and the device side of the module.

Potential equalisation connection

  • PE connection: Low-impedance connection between module and lightning current equipotential bonding by cold-welded connection terminal, spring-loaded screw connection, gas-tight crimped cable lug and uncut cable routing with 2.5 mm².
  • Connection terminal: Terminal with very high current carrying capacity, best long-term reliability due to permanently gas-tight connection of the terminal to the assembly by 36 homogeneously cold-welded contact points with a pull-out force of 900 N, thereby low-resistance contact resistance with < 200 µOhm,
  • Screw connection: pre-assembled connection with washers, spring lockwasher, nut and crimping cable lug (acc. to DIN 46234)
  • Crimpable conductor class: For the supplied crimp cable lug, please use only stranded, fine-stranded or fine-stranded conductors with 2.5 mm² (conductor classes 2, 5 and 6 according to DIN/IEC 60228, our recommendation: H07V-K2.5 gn/ge).
  • Crimping pliers: For the supplied crimping cable lug, please use only crimping pliers for uninsulated crimping cable lugs according to DIN/IEC 46234.
  • Stripping length: 5 mm
  • Connection thread: M3
  • Maximum tightening torque: 0.5 Nm
  • Breaking torque set screw: 1.5 Nm

Notes for use of other crimp terminals: Instead of the supplied crimping cable lug, you can also use other ones if you want to connect with a larger cross-section or use a solid conductor. Pay attention to the hole for M3. Crimping cable lugs with 4 and 6 mm² are available in the trade for this purpose. Please make sure to use the correct crimping tool for the respective crimping cable lug.

Protection class Module

  • Protection class: III / SELV (according to EN60730).
  • Protection class: IP 00 (according to EN 60529)


  • Construction: Open REG housing
  • Mounting: This surge arrester is intended for fixed mounting on the top-hat rail in distribution boards inside buildings (Din Rail 35 mm according to EN 50022).
  • Ambient temperature: -20°C to +70 °C
  • Humidity: 98% rH (without condensation)
  • Mounting: DIN Rail 35 mm (EN50022)
  • Material housing: Polyamide
  • Colour: Green
  • Dimensions: 76 mm x 22.5 mm x 40 mm (l x w x h with housing)
  • Weight: 39 g (with housing)