Three Phase 4 Pole Surge Protection Device WSPD440
The WSPD440 is a high-performance 4 Pole Type 2 Surge Protection Device designed to protect three-phase systems with neutral (3P+N) from voltage transients, lightning strikes, and switching surges. Rated at 40kA max discharge, it offers full coverage for residential, commercial, and industrial installs where critical equipment or sensitive electronics are...
The WSPD440 is a high-performance 4 Pole Type 2 Surge Protection Device designed to protect three-phase systems with neutral (3P+N) from voltage transients, lightning strikes, and switching surges. Rated at 40kA max discharge, it offers full coverage for residential, commercial, and industrial installs where critical equipment or sensitive electronics are in use.
DIN-rail mountable and built to meet BS7671 and 18th Edition standards, this SPD ensures compliance and peace of mind on surge-prone circuits - from panel boards to distribution units.
- Type 2 SPD – 3 phase + neutral protection (3P+N)
- Discharge capacity: 20kA nominal / 40kA max
- DIN-rail mountable – 4 module width
- Visual fault indicators – red/green status display
- Rated voltage: 230/400V AC (Uc 275V)
- Compatible with TN-S and TT systems
This unit is ideal for surge protection in 3-phase boards without the need for enclosure-based units. Fast fit, failsafe disconnect, and installer-tested performance.
What does a 4 pole SPD protect?
It provides surge protection across all three phases and the neutral (3P+N), offering complete coverage for balanced and unbalanced loads in three-phase systems.
Does this SPD comply with 18th Edition regulations?
Yes – it meets BS EN 61643-11 and satisfies 18th Edition surge protection requirements for both residential and commercial installs.
Where should I install this SPD?
Install as close as possible to the origin of the supply, typically at the main distribution board, with a direct earth connection to minimise let-through voltage.
- Product Code: WSPD440
- SPD Type: Type 2
- Poles: 4 (3P+N)
- Nominal Discharge Current (In): 20kA
- Max Discharge Current (Imax): 40kA
- Operating Voltage: 230/400V AC (Uc 275V)
- Mounting: 35mm DIN rail
- Terminal Capacity: 2.5–25mm²
- Status Indicators: Mechanical (red/green)
- IP Rating: IP20
- Temperature Range: -40°C to +85°C
- Standards: BS EN 61643-11 / BS7671:2018+A2:2022
This SPD should be installed upstream of final circuits, as close as possible to the incoming supply. Suitable for three-phase TN-S and TT systems with a neutral connection. Ensure proper earth bonding and SPD disconnection path as per 18th Edition guidelines.
- Install on DIN rail inside a suitable enclosure or consumer unit
- Connect L1, L2, L3, and N to matching terminals
- Use shortest possible earth conductor to MET
- Verify correct orientation and indicator status post-install
