Mersen 83230121 Surge-Trap STPT23-20K275V-3P-LFM Type 2+3 surge protection device with 20 kA discharge capacity for three-phase 230/400 V AC electrical installations.
Original price was: £114.57.£84.67Current price is: £84.67.
The Mersen 83230121 is a high performance Type 2+3 Surge Protection Device (SPD) designed to protect low voltage electrical installations against transient overvoltages caused by lightning strikes and switching events. Part of the trusted Mersen Surge-Trap® STPT23 LF Series, this pluggable SPD delivers dependable protection for commercial, industrial and automation applications.
Designed for three-phase electrical systems, the device combines compact construction with excellent surge handling capability. Its pluggable design simplifies maintenance, while integrated remote indication allows easy monitoring of device status within electrical distribution systems.
With a maximum discharge current of 20 kA (8/20 μs), a 275 V AC continuous operating voltage (Uc) and a 230/400 V AC nominal operating voltage, the Mersen 83230121 provides reliable protection for switchboards, control panels and industrial installations where equipment availability is critical.
Surge protection devices divert damaging transient voltages away from sensitive electrical equipment before they can cause failures or reduce equipment lifespan. Installing a quality SPD helps minimise downtime, improve system reliability and protect valuable industrial assets.
The Mersen Surge-Trap® STPT23 range is engineered for modern electrical installations requiring dependable protection of automation equipment, switchboards, PLCs, control panels and industrial machinery operating on three-phase power systems.
| Voltage | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® STPT23 LF Series |
| Model | STPT23-20K275V-3P-LFM |
| SKU | 83230121 |
| Product type | Surge Protection Device (SPD) |
| SPD classification | Type 2+3 / Class II+III |
| Maximum discharge current (Imax) | 20 kA (8/20 μs) |
| Nominal discharge current (In) | 10 kA |
| Continuous operating voltage (Uc) | 275 V AC |
| Nominal operating voltage (Un) | 230/400 V AC |
| System configuration | 3+0 TNC |
| Number of poles | 3 |
| Mounting format | Pluggable modular device |
| Protection mode | L-PE(N) |
| Response time | 25 ns |
| Maximum back-up fuse | 63 A gG |
| RoHS compliant | Yes |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
It protects low voltage electrical installations and connected equipment from transient overvoltages caused by lightning and switching events.
The unit is an IEC Type 2+3 (Class II+III) surge protection device designed for low voltage installations.
It is designed for 230/400 V AC three-phase 3+0 TNC systems with a continuous operating voltage of 275 V AC.
Yes. The device features a pluggable design that allows rapid replacement during maintenance.
Yes. The Mersen 83230121 includes a remote indication contact for integration with monitoring and building management systems.
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, panel builders and industrial maintenance professionals to protect valuable electrical infrastructure from damaging transient overvoltages.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...