Surge Arrester

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DEHN 952400 DG M TNS 275 Surge arrester type 2 Surge arrester

The DEHNguard M surge arrester, type 2 according to EN 61643-11, offers comprehensive protection for low-voltage installations. The system consists of a base part and plug-in protection modules and features the innovative thermo-dynamic control for reliable arrester monitoring. Ideal for lightning protection zone concepts at interfaces from zone 0B to 1 and higher.Features:Protection class (IP): IP20Packaging unit: 1Weight: 0.41 kgWeight unit: KGWeight reference quantity: 1Statistical goods number: 85363030Mounting type: Top-hat rail TH35Size: 4 TEProtection level: 1.5 kVMaximum continuous AC voltage: 275 VRated leakage surge current (8/20): 20 kARated AC voltage: 230 VTest class type 2: yesSignalling on the device: opticalNumber of conductors (without earth): 4Protection level N-PE: 1.5 kVMax. Max. conductor cross-section rigid (solid/multi-stranded): 35 mm²Max. Max. conductor cross-section flexible (finely stranded): 25 mm²Mains type TN-S: yesMax. Leakage surge current (8/20): 40 kAShort-circuit strength (Isccr): 50 kAMax. Overcurrent protection device stub wiring (fuse): 125 AMax. Overcurrent protection device V-wiring (fuse): 100 AVersion: for TN-S systemsBrief description: Surge arrester type 2 DEHNguard M 4-pole for TN-S systems

€94.72*

Surge arrester Lightning protection type II, 275 V AC, 20 kA, 4-pole

Surge arrester lightning protection type II, 275 V AC, 20 kA, 4-poleArticle number: SGS1-C/4-275-20The 4-pole type II surge arrester reliably protects electrical systems against transient overvoltages. It is ideal for use in three-phase TN systems (TN-C, TN-C-S, TN-S) and fulfils protection class C in accordance with IEC 61643-1 (transition LPZ1 → LPZ2).Technical data:Version: 4-pole (L1, L2, L3 + N)Voltage (Uc): 275 V ACRated leakage current (In): 20 kA (8/20 µs) per poleMax. Pulse current (Imax): 40 kA (8/20 µs) per poleProtection level (Up): typ. < 1.2 kVResponse time: < 25 nsImpulse withstand voltage (Uimp): 2.5 kV (category II)Protection class: Type II (C) according to IEC 61643-1Systems: TN-C, TN-C-S, TN-S

€49.90*

DEHN 900396 ZP B TT 255 Combined arrester type 1+2

The 4-pole DEHNshield ZP B TT 255 combined arrester is designed for use in 230/400 V TT and TN-C-S systems. It fulfils the requirements of the VDN guideline for installation in the lower connection compartment of the meter panel in front of the electricity meter.Thanks to tool-free installation, the device can be snapped directly onto a 40 mm busbar system. It combines type 1 and type 2 protection functions in accordance with EN 61643-11 in one device and is therefore ideal for lightning and surge protection in building installations.Product features:High-performance spark gap technology for safe limitation of follow currentsMaximum continuous voltage (Uc): 255 V ACProtection level (Up): ≤ 1.5 kVLightning impulse current Iimp (10/350 µs): 30 kAFollow-up current extinguishing capacity: up to 25 kAeffEnergised in accordance with DIN EN 62305-4Integrated function indicatorCompatible with the DEHN Red/Line familyDirect device protection through coordination with terminal devices

€145.89*

DEHN 909330 DSH ZP B2 TNC 255 Combined arrester

Lightning and surge protection for residential buildings without external lightning protection - ideal for TN-C networks with overhead line feed, installation in the meter area (in front of the meter).Technical data (summary):Type 1 + 2 + 3 combined arrester, protection class I/II/IIIRated voltage: 230/400 V AC, UC: 255 V ACLightning impulse current: 22.5 kA (10/350 µs), 7.5 kA per conductorProtection level (UP): ≤ 1.5 kVMounting: Tool-free on 40 mm busbar (Click+Power)Connection: 3-pole for L1, L2, L3 - with PENDisplay: visual (green = operational, red = faulty)Dimensions: Only 38 mm wideProtection class: IP30, temperature range: -40 °C to +80 °CSpecial features:Robust spark gap technology (RAC) for high lightning current loadCoordinated with terminal device protection (≤ 10 m cable length)Completely maintenance-free, compact designNo additional back-up fuse up to 160 A gG requiredSimple, quick installation without toolsApplication recommendation:Ideal as central surge protection for TN-C supply in residential and small properties - can be used directly at the feed-in point.

€174.45*

Fire protection switch AFDD 1P+N B16A

Fire protection switch with integrated RCBO - TÜV certifiedMaximum safety thanks to integrated fire protection to the latest standardThe SGBR2-40AFDx, EPBR2-40AFDx and MGBR2-40AFDx series fire circuit-breakers combine state-of-the-art arc fault detection (AFDD) with the protection of an RCBO (RCD/LCB combination) - for reliable protection against electrical fires, residual currents and short-circuits in just one device. They reliably detect and switch off in the event of serial, parallel and earth fault arc faults - in accordance with the requirements of DIN VDE 0100-420. Product featuresAFDD integrated in RCBO (FI/LS combination)Reliably detects and switches in the event ofSerial arc faultsParallel arc faultsEarth fault arc faultsRated voltage: 230/240 V AC, 50 HzRated current: 6-40 A (depending on model)Tripping behaviour: Type B or C (short-circuit characteristic)Residual current behaviour: Type A or ACRated residual current (I∆n): 10 / 30 / 100 / 300 mANumber of poles: 1P+N or 2PInsulation voltage (Ui): 500V withstand voltage: 4.0 kVTemperature range: -25 °C to +40 °C

€89.25*

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Surge Protection Devices (SPD): Professional Surge Arresters for Lightning and Overvoltage Protection

Surge protection devices (SPDs), also known as surge arresters or transient voltage surge suppressors, are essential components in modern electrical installations. They safely divert dangerous overvoltages caused by lightning strikes, utility switching operations, or other transients to ground, limiting the voltage to a safe level for connected equipment. High-quality SPDs help electrical contractors, construction companies, renovation firms, industrial plants, research centers, van conversion specialists, and professional electricians meet stringent safety standards such as IEC 61643-11 and national requirements.

How Surge Protection Devices Work

A surge protective device reacts within nanoseconds to voltage spikes and diverts the surge energy to earth. This rapid response prevents costly damage to machinery, control systems, IT infrastructure, sensitive measuring equipment, and other critical loads. Professional electricians value the modular DIN-rail mounting and clear status indicators that allow quick visual inspection and maintenance.

Types of Surge Protection Devices (SPD)

The right SPD type depends on the installation location and the expected surge risk:

Type 1 SPD (Lightning Current Arrester): Handles very high impulse currents (10/350 µs waveform) and is installed at the main service entrance, especially in buildings with external lightning protection systems.
Type 2 SPD: Protects against indirect lightning effects and switching surges (8/20 µs waveform). It is the most common choice for sub-distribution boards.
Combined Type 1+2 SPD: Offers both high-energy lightning protection and surge limitation in a single compact unit, reducing installation time and space requirements.
Type 3 SPD (Fine Protection): Provides additional point-of-use protection for highly sensitive end devices.

Applications of Surge Protection Devices

Surge arresters deliver reliable protection across many professional sectors and help ensure operational continuity, equipment longevity, and compliance with safety regulations:

Electrical service companies and professional electricians: Essential for new installations, upgrades, and maintenance projects to deliver long-term system safety.
Construction and renovation companies: Required to meet current electrical codes in new builds and refurbishment of commercial and residential properties.
Industrial companies: Safeguard production lines, CNC machines, PLCs, drives, and server rooms against downtime caused by surges.
Research centers and laboratories: Protect precision measuring instruments, analytical equipment, and data acquisition systems from voltage disturbances.
Van conversion and mobile installations: Secure 230 V / 120 V onboard electrical systems in campers, service vans, and mobile workshops against fluctuations from shore power or generators.
Commercial and workshop environments: Protect office equipment, lighting, HVAC systems, and other critical loads in workshops and business premises.

Comparison of Surge Protection Device Types

Type	Installation Location	Waveform / Discharge Current	Voltage Protection Level (Up)	Typical Applications
Type 1 (Lightning Current Arrester)	Main distribution / service entrance (with external lightning protection)	10/350 µs, up to 100 kA (Iimp)	≤ 2.5 kV	Buildings with lightning protection systems, equipotential bonding
Type 2	Sub-distribution boards	8/20 µs, 20–40 kA (In)	≤ 1.5 kV	Industrial, commercial, renovation projects
Combined Type 1+2	Main or sub-distribution	Combined waveforms	≤ 1.5 kV	Space-saving all-in-one protection for many installations
Type 3	Near end devices or outlets	1.2/50 µs + 8/20 µs	≤ 1.0 kV	Fine protection for measuring equipment, IT, and lab technology

Selection Criteria and Professional Installation

When selecting an SPD, professionals consider the network configuration (TN-S, TT, TN-C), number of poles (usually 3- or 4-pole), discharge capacity, and proper coordination between protection stages. SPDs are mounted on standard 35 mm DIN rails inside distribution boards. Correct installation by qualified electricians ensures maximum performance, safety, and regulatory compliance.

Frequently Asked Questions about Surge Protection Devices (FAQ)

When are surge protection devices (SPDs) required by standards?

SPDs are mandatory or strongly recommended in many new installations, renovations, and high-risk environments (industrial, commercial, or sensitive equipment) to prevent personal injury and property damage according to IEC and national electrical codes.

What is the difference between Type 1 and Type 2 surge protection devices?

Type 1 SPDs handle extreme lightning currents and are installed at the building entrance. Type 2 SPDs protect against more frequent, lower-energy surges and are typically used in sub-distribution panels.

Are combined Type 1+2 SPDs a good solution?

Yes. They combine lightning current and surge protection in one device, saving space in the panel and simplifying planning and installation.

How long does a surge protection device last?

Service life depends on the frequency and severity of surge events. Most quality SPDs include visual or remote status indication to show when replacement is needed.

Which SPDs are suitable for industrial applications?

Robust Type 2 or combined Type 1+2 devices with high discharge capacity and good coordination with downstream protection stages reliably safeguard machines, controls, and production processes.

Can surge protection devices be used in van conversions?

Yes. Compact DIN-rail SPDs protect the AC electrical system in motorhomes, service vans, and mobile units from voltage fluctuations caused by shore power or generators.

Do surge protection devices also protect data and signal lines?

For data, network, telephone, or bus lines, specialized SPD modules should be installed in addition to power surge protectors.

What benefits do SPDs offer in research centers?

They protect sensitive measurement and analysis equipment against voltage spikes, preserving accuracy and preventing expensive damage or data loss.

How can you tell if a surge protection device is defective?

Most devices feature an integrated LED or mechanical indicator. A red signal or missing display usually means the module needs replacement.