Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
Mersen Surge Protector Type 2 SPD 2 Pole 230/400 Volt 20KA IT
Mersen STPT2-40K440V-2P Type 2 surge protection device with 40 kA Imax, 440 V AC maximum continuous operating voltage, 2-pole pluggable DIN rail design for IT and TNS electrical systems.
This product has been discontinued
A direct replacement is available below.
Replacement product
K2-2P440 Mersen Surge Protector Type 2 SPD 2 Pole 230/400 Volt 20KA IT
SKU: 44020218
£56.09 ex VAT
View
Why Choose the Mersen STPT2-40K440V-2P Surge Protection Device?
The Mersen STPT2-40K440V-2P (Part Number 83020126) is a high-performance Type 2 Surge Protection Device (SPD) engineered to protect low-voltage electrical installations against transient overvoltages caused by lightning activity and electrical switching events. As part of the Mersen Surge-Trap® Pluggable STPT2 Series, it delivers dependable protection for industrial, commercial and infrastructure applications.
Featuring a 40 kA maximum discharge current (Imax), pluggable modular construction and DIN rail mounting, this surge protection device offers reliable protection while allowing quick replacement of protection modules during maintenance. Its compact format makes installation straightforward within distribution boards and control panels.
Designed for 230 V AC IT systems and 400 V AC TNS systems with a 2-pole configuration, the STPT2-40K440V-2P is ideal for protecting automation equipment, industrial machinery, commercial electrical installations and critical building services.
Key Advantages
- Reliable Type 2 surge protection device for low-voltage installations.
- 40 kA maximum discharge current for effective transient protection.
- Pluggable modular design simplifies servicing and maintenance.
- Compact DIN rail mounting for electrical panels.
- Suitable for IT and TNS network configurations.
- Designed for industrial, commercial and infrastructure applications.
Key Features
- Mersen Surge-Trap® STPT2 Series.
- Type 2 / Class II surge protection device.
- 40 kA Imax discharge capacity.
- 20 kA nominal discharge current (In).
- 440 V AC maximum continuous operating voltage (Uc).
- 230 V AC IT / 400 V AC TNS network compatibility.
- 2-pole pluggable construction.
- DIN rail mounting.
- Visual end-of-life indication.
Reliable Protection Against Electrical Surges
Type 2 surge protection devices are installed within low-voltage distribution systems to reduce the effects of transient overvoltages before they reach sensitive electrical equipment. This helps minimise equipment damage, reduce downtime and improve long-term system reliability.
The Mersen STPT2 Series combines high surge capacity with a modular pluggable design, enabling rapid cartridge replacement and reduced maintenance time without rewiring the complete surge protection assembly.
Typical Applications
- Industrial automation systems.
- Electrical distribution boards.
- Commercial buildings.
- Machine control panels.
- Building management systems.
- Water treatment facilities.
- Telecommunications and data centres.
- Renewable energy installations.
Technical Specifications
Tick the specs you need, then view products that match.
| Voltage | 400 V | |
|---|---|---|
| Phase | Single Phase | |
| Poles | 2-pole | |
| Device Type | Surge protection device | |
| SPD Type | Type 2 | |
| Earthing System | IT, TN-S | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | No | |
| Manufacturer | Mersen | |
| Series | Surge-Trap® Pluggable STPT2 Series - 40kA | |
| Model | STPT2-40K440V-2P | |
| Part Number | 83020126 | |
| Product type | Type 2 Surge Protection Device | |
| IEC classification | Class II | |
| Maximum discharge current (Imax) | 40 kA (8/20 μs) | |
| Nominal system voltage | 230 V AC (IT) / 400 V AC (TNS) | |
| Maximum continuous operating voltage (Uc) | 440 V AC | |
| Number of poles | 2 | |
| Configuration | TN-S (also suitable for 230 V IT) | |
| Mounting type | DIN rail | |
| Construction | Pluggable modular | |
| Protection rating | IP20 | |
| RoHS compliant | Yes | |
| HS Code | 85363090 | |
| Country of Manufacture | Spain |
Frequently Asked Questions
What is the Mersen STPT2-40K440V-2P used for?
It protects low-voltage electrical installations from transient overvoltages caused by lightning activity and electrical switching events.
What type of surge protection device is this?
This model is a Type 2 / Class II surge protection device for electrical distribution systems.
What is the maximum surge current rating?
The STPT2-40K440V-2P provides a 40 kA maximum discharge current (Imax) and a nominal discharge current of 20 kA.
Which electrical systems is this model designed for?
It is designed for 230 V AC IT systems and 400 V AC TNS systems using a 2-pole configuration.
How is this surge protection device installed?
The device mounts directly onto a standard DIN rail and features a pluggable modular design for simplified maintenance.
Trusted by Electrical Professionals Worldwide
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, panel builders and maintenance professionals to provide dependable protection for critical low-voltage electrical installations.
