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K1-2PG320 Mersen Surge Protector Type 1+2 SPD 2 Pole 277 Volt 20KA TT

K1-2PG320 Mersen Surge Protector Type 1+2 SPD 2 Pole 277 Volt 20KA TT

Mersen K1-2PG320 Type 1+2 surge protection device for TT and TN-S single-phase electrical systems with coordinated L-N and N-PE protection.

SKU: 44120208Alt SKU: K1-2PG320MPN: 44120208
Price
List Price £164.77 ex VAT
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Manufacturer Lead Time

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Why Choose the Mersen K1-2PG320 Type 1+2 Surge Protection Device?

The Mersen K1-2PG320, product code 44120208, is a premium Type 1+2 Surge Protection Device (SPD) designed to protect single-phase TT and TN-S (1Ph+N) electrical installations against lightning strikes and transient overvoltages. As part of the Mersen Surge-Trap® K1 Series, it combines coordinated line-to-neutral (L-N) and neutral-to-earth (N-PE) protection within a compact, pluggable two-pole assembly for installation at the main distribution board.

Designed for 277 V AC systems, the K1-2PG320 features a 1+1 protection configuration, a maximum continuous operating voltage (Uc) of 320 V AC, and replaceable protection cartridges for simplified servicing. Its coordinated protection provides dependable safeguarding of sensitive electrical equipment against both lightning currents and switching surges.

With a 12.5 kA lightning impulse current (Iimp), 50 kA maximum discharge current (Imax), 20 kA nominal discharge current (In) and a voltage protection level of ≤1.5 kV, the K1-2PG320 complies with IEC 61643-11 and is suitable as the first level of surge protection in low-voltage installations.

Key Advantages

  • Combined Type 1 + Type 2 surge protection.
  • Suitable for TT and TN-S single-phase (1Ph+N) systems.
  • 1+1 coordinated protection for L-N and N-PE.
  • Pluggable cartridges simplify maintenance.
  • 50 kA maximum discharge current (Imax).
  • Compact two-module DIN rail installation.

Key Features

  • Manufacturer: Mersen
  • Series: Surge-Trap® K1
  • Model: K1-2PG320
  • Product code: 44120208
  • SPD Type: IEC Class I + II (Type 1+2)
  • Configuration: 1+1
  • Protection modes: L-N and N-PE
  • Visual status indication.

Coordinated Surge Protection for TT and TN-S Systems

The Mersen K1-2PG320 provides coordinated protection across both line-to-neutral and neutral-to-earth conductors, safely diverting lightning currents and switching surges away from sensitive electrical equipment. Installed at the origin of the electrical installation, it helps minimise equipment damage, downtime and maintenance costs.

Its pluggable design allows rapid replacement of protection cartridges when required, ensuring continued protection with minimal disruption to the installation.

Typical Applications

  • Main electrical distribution boards.
  • Commercial buildings.
  • Industrial facilities.
  • Residential electrical installations.
  • Solar photovoltaic systems.
  • Battery energy storage systems.
  • EV charging infrastructure.
  • Telecommunications equipment.
  • Critical infrastructure.

Technical Specifications

SPD Type Type 1+2
Voltage 277 V
Phase Single Phase
Manufacturer Mersen
Series Surge-Trap® K1
Model K1-2PG320
Product code 44120208
EAN 8435297888086
Product type Type 1+2 Surge Protection Device
IEC SPD classification Class I + II
UL SPD classification Type 1 Component Assembly
Configuration TN-S, TT
System configuration TN-S, TT
Nominal voltage (Un) 277 V AC
Maximum continuous operating voltage (Uc L-N) 320 V AC
Maximum continuous operating voltage (Uc N-PE) 255 V AC
Lightning impulse current (Iimp 10/350 μs) 12.5 kA
Nominal discharge current (In 8/20 μs) 20 kA
Maximum discharge current (Imax 8/20 μs) 50 kA
Voltage protection level (Up) ≤1.5 kV (L-N and N-PE)
Protection modes L-N / N-PE
Mounting 35 mm DIN rail
Format Pluggable
Number of poles 2
Status indication Green (OK) / Not green (replace)
Maximum back-up fuse 315 A gG
Housing material PA6 CT1 & PA66 CT1
Flammability rating UL94 V-0
Width 36 mm
Height 90 mm
Depth 90.4 mm
Weight Approx. 0.345 kg
RoHS compliant Yes
Applicable standard IEC 61643-11
Poles 2-pole
Device Type Surge protection device
Earthing System TN-S, TT
Nominal Discharge Current (In) 20 kA
Remote Signal No

Frequently Asked Questions

What is the Mersen K1-2PG320 used for?

It protects TT and TN-S single-phase electrical installations against lightning currents and transient overvoltages using coordinated Type 1+2 surge protection.

Which earthing systems is it suitable for?

The K1-2PG320 is designed for TT and TN-S (1Ph+N) electrical systems.

What does the 1+1 configuration mean?

It provides coordinated protection across both the line-to-neutral (L-N) and neutral-to-earth (N-PE) circuits.

Are the protection cartridges replaceable?

Yes. The K1-2PG320 features pluggable cartridges that can be replaced without removing the DIN rail base.

Where is this SPD normally installed?

It is installed within the main electrical distribution board to provide primary surge protection for the entire installation.

Trusted By Electrical Professionals

Mersen Surge-Trap® K1 Series surge protection devices are trusted worldwide by electrical engineers, contractors and panel builders for dependable protection against lightning and transient overvoltages in commercial, industrial and critical infrastructure installations.

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