A surge arrester is a protective device for limiting voltage on equipment by discharging or bypassing surge current. Surge arresters protect other electrical equipment by discharging surge currents caused by external or internal forces. Surge arresters limit overvoltages often caused by lightning or switching surges that can occur when operating conditions suddenly change. An arrester does not absorb or stop lightning, it diverts it and limits the voltage going through the device, protecting the equipment installed in parallel.

Enerdoor’s surge arrester series has been specifically designed to offer surge protection for electrical equipment. Surge arresters are installed at the front end of a system for the purpose of diverting harmful overvoltage transients caused by external (lightning) or internal (switching) events to ground safely.

Also known as Surge Protection Device (SPD), or Transient Voltage Surge Suppressor (TVSS), Enerdoor surge arresters protect against electrical transients resulting from lightning strikes that find their way onto electrical conductors.

Enerdoor provides a range of nine types of Surge Arresters: SM, BG (G) 25, BG (G) 50, BM (G) 12.5, EMG (G) 20, EMG (G) 40, EMG (G) 60, FINPR and FINPRS.

All models include remote contact, visual indicator, and comply with the UL 1449, IEC 61643-11, and VDE 0675 International Standards. DIN rail or screw mounting options are available with select models offering plug and play replaceable cards for quick and easy installation and replacement.

Surge Arresters Brochure here 

For further information on Enerdoor’s surge arresters, please contact us on 01444 243 452 or email [email protected].

Mersen offers four types of surge arresters: power frequency overvoltage protection for power lines, surge protection components, surge protection or power lines, surge protection for solar photovoltaic systems.

Power Frequency Overvoltage Protection for Power Lines

Combined SPD + POP

Surge-Trap POP + SPD Type 2 – For Contractor

POP CT is the series of combined power frequency overvoltage protection (POP) and surge protection device for discharging surge current in the first step of protection. Intended for actuation on the contractor of an installation (not included). It is suitable for the first stage of protection in commercial or other applications not exposed to direct strikes and with no external lightning protection system. These devices are extremely popular for installation in lightning panels.

Features

– Maximum discharge current (8/20μs): 40kA per phase

– Nominal discharge current (8/20μs): 15kA per phase

– Un (L+N/L-L): 230/400V

– DIN-rail mountable, monobloc format

– Visual and remote end of life indicators

– Back- up fuse: 80 A gG

– Maximum break time (400V): 0,2 s

– Maximum break time (275V): 15 s

Surge Protection Components

Overvoltage Protection – Thermally Protected Metal-oxide Varistor

TPMOV UL Type 1 – 34MM – 50kA

Mersen’s patented TPMOV (Thermally Protected Metal Oxide Varistor) eliminates common destructive failure modes associated with standard MOVs. it features a voltage clamping device and a disconnecting apparatus that monitors the status of the metal oxide disk inside the TPMOV. The device is securely disconnected in the event of an overvoltage by an arc shield. Upon failure, the TPMOV is also equipped with a visual pin indicator as well as a normally open microswitch providing remote indication, if applicable.

Features

– 50kA 8/20 MicroSec Max Surge Rating

– UL 1449 Third Edition Recognised

– Consistent footprint with 25-40mm MOV’s

– Visual/Remote Indication

– Small package

Surge Protection for Power Lines

Mersen are world-leading manufacturers in electrical power and advanced materials. Mersen offers an extensive range of surge protection solutions for power lines, photovoltaic systems, components and outdoor and commercial LED lighting.

NEMA UL/CSA
Type 1

Surge-Trap STXH Series – 50kA

The most compact of the Mersen STX series offering, the Surge-trap Type 1 STXR meets requirements for uL 1449 Fourth Edition and is ideal for the replacement of obsolete surge arrestors. The STXR Series SPD feature TPMOV technology making them the safest product available. With a small, compact design and line or load installation flexibility the STXR series is the perfect fit for branch panel or individual equipment protection.

Surge-Trap STXR Series – 50kA

The most popular range in the STX Series offering, the Surge-Trap type 1 STXR meets requirements for UL 1449 Fourth Edition and is ideal for the replacement of obsolete surge arrestors.

Surge-Trap STXP Series – 100kA

The Surge-Trap Type 1 STXP Series offers advanced performance and features over the STXR series including higher surge capacity and phase LED status indicators. The STXP features TPMOV technology making them safe and reliable. The STXP meets requirements for uL1449 Fourth Edition and has been designed for additional mounting flexibility including mounting feet and flush-mount capability. Installation can be done on the line or load side of a panel.

Surge-Trap STXT Series – 200kA

The Surge-trap Type 1 STXT Series is the most advanced of the STX Series. It comes standard with EMI/RFI Filtering and surge capacities up to 200kA. The STXT features TPMOV technology making it reliable and is available with line or load side installation flexibility.

Surge-Trap STZ-R Series (internal SPD) – 450kA

The Surge-Trap STZ-R Series features surge capacities up to 450kA and are designed using Mersen’s industry leading TPMOV technology. The Surge-trap STZ Series is ideal for OEMs and panel builders, this internal SPD can be installed on the line or load side of the service entrance.

Surge-Trap STZ Series (External SPD) – 450kA

The Surge-Trap STZ Series features surge capacities up to 450kA and are designed with Mersen’s TPMOV technology. Options include surge counter, through the door disconnect switch, audible alarm, dry contact and EMI/RFI filtering.

Surge-Trap STT Series – 50kA

The Surge-Trap Type 1 SPD is a fail-safe and economical solution for applications that require a NEMA-style SPD. It is uL 1449 Third Edition approved and offers a wide range of voltage configurations to meet all needs in its class. It features Mersen’s TPMOV technology which eliminates the need for additional overcurrent protection, providing sustantial cost savings.

DIN-Rail UL/CSA
Type 1

Surge-Trap Monobloc ST Series – 50kA

Surge-Trap Modular Surge Protective Device (SPD) is a no-fuse, fail-safe surge suppressor featuring Mersen’s TPMOV technology. UL 1449 Fourth Edition approved, it is DIN-rail mountable featuring fail-safe self-protected design, visual indicator and a small footprint. A remote indicator option provides status to critical control circuitry. The Surge-Trap Modular SPD has a high short circuit rating and a thermally protected MOV, which eliminates the need for additional overcurrent protection devices.

Surge-Trap Pluggable STP Series – 50kA

The Surge-Trap Pluggable SPD is a no-fuse, fail-safe surge suppressor and fetaures the TPMOV technology. The Surge-Trap Pluggable is UL 1449 Fourth Edition approved, it is DIN-rail mountable with a fail-safe self-protected design, visual indicator and a small footprint.

DIN-Rail IEC Type
1 / Class I

Surge-Trap Monobloc STMT1 Series – 50kA

STM T1 50 is the most robust series of single pole type 1/Class I lightning current arresters, able to discharge energy (current) from a direct lightning strike (10/350) on an external lightning protection system (LPS) or overhead supplies, in accordance with EN/IEC 61643.

DIN-Rail IEC
Type 1+2 / Class I+II

Surge-Trap Pluggable STPT12 Series 12.5kA

STP T12 12.5 is the series of combined Type 1+2/class I+II devices for discharging lightning currents and protecting against voltage surges, in accordance with EN/IEC 61643. Suitable as the first step of protection in incoming power supply panels and areas with exposure to the atmosphere, where installations are usually provided with an external lightning protection.

Surge-Trap Pluggable STPT12 Series – 25kA

STP T12 25 is the series of the combined Type 1+2/Class I+II devices for discharging lightning currents and protecting against voltage surges, in accordance with EN/IEC 61643. Suitable as the first step of protection in incoming power supply panels and areas with exposure to the atmosphere, where installations are usually provided with an external lightning protection.

DIN-Rail IEC
Type 2 / Class II

Surge-Trap Pluggable STPT2 Series – 40kA

STP T2 40 is the series of Type 2/Class II devices for discharging voltage surges, in accordance with EN/IEC 61643. Suitable for the second stage of protection in supply distribution panels in which Type 1 protection devices are installed upstream, or for the first stage of protection in commercial or other applications not exposed to direct strikes and with no external lightning.

DIN-Rail IEC
Type 2+3 / Class II+III

Surge-Trap Pluggable STPT23 Series – 20kA

STP T23 20 is the series of combined Type 2+3/Class ii+iii devices for discharging voltage surges while providing a very fine voltage protection level, in accordance with EN/IEC 61643. Suitable as the final stage of protection in panels with Type 2 protection devices installed upstream such as STP T2 40 SPDs should be installed as close as possible.

Surge-Trap Monobloc STMT23 Series – 20kA Slim

STM T23 20 S is the series of combined Type 2+3/Class II+II devices for discharging voltage surges while providing a very fine voltage protection level, in accordance with EN/IEC 61643. Suitable as the final stage of protection in panels with type 2 protection devices installed upstream. These SPDs should be installed as close as possible to the equipment being protected. This device is ideal for limited spaces and has a wide range of voltage ratings.

Surge-Trap Monobloc STET23 Series – 20kA with EMI Filter

STE T23 20 is the series of combined Type 2+3/Class II+III devices for discharging voltage surges while providing a very fine voltage protection level, in accordance with EN/IEC 61643. Complete with a built-in powerful EMI filter. Suitable as the final stage of protection in installations with electromagnetic distrurbances which might interrupt, degrade or limit system performance. Series connection for applications up to 20A rated current.

Surge Protection for Solar Photovoltaic Systems

DC Power Line Protection

Mersen are global experts in designing electrical solutions for motors and generators and are specialised in safety and reliability for electrical power.

Surge-Trap Pluggable STPT2 Series – 40kA PV

STP T2 40 PV is the series of devices that provide advanced overvoltage protection to the photovoltaic systems by utilising Mersen’s optimised dynamic thermal disconnection system.

It does not require additional overcurrent protection (back-up fuses) due to its high short-circuit withstand rating. These surge protective devices are suitable for all PV applications, including: large scale, rooftop and self-consumption (off-grid) DC installations.

Features

– Maximum discharge current (8/20μs): 40kA

– Nominal discharge current (8/20μs): 10kA, 20kA

– Ucpv: 65, 80, 660, 1060 Vdc and 1500 Vdc

– Iscpv: 10kA (EN 50539-11), no back-up fuse required

– DIN-rail mountable, plug-in format

– Visual and remote end of life indicators

– Reversible chassis to allow cable entry from above or below

– Mechanically coded cartridges to avoid cartridge replacement errors

For further information on surge protection products please contact us on 01444 243 452 or email [email protected].