3 Pole Surge Protection Device WSPD340
The WSPD340 is a 3-pole Type 2 Surge Protection Device designed for three-phase boards. Rated at 20kA nominal discharge and 40kA max discharge, it provides reliable protection against transient overvoltages caused by indirect lightning strikes and switching surges. Built to comply with BS 7671 and the 18th Edition wiring regulations,...
The WSPD340 is a 3-pole Type 2 Surge Protection Device designed for three-phase boards. Rated at 20kA nominal discharge and 40kA max discharge, it provides reliable protection against transient overvoltages caused by indirect lightning strikes and switching surges.
Built to comply with BS 7671 and the 18th Edition wiring regulations, this SPD safeguards sensitive electronic equipment in residential, commercial, and industrial installations. Compact and DIN-rail ready, it’s a fast, compliant way to keep three-phase systems protected.
- Type 2 SPD: Meets 18th Edition surge protection requirements
- 3-pole design: Protects all three live conductors (L1, L2, L3)
- High capacity: 20kA nominal, 40kA max discharge
- Failsafe disconnection: Built-in mechanism isolates faulty SPD
- Status indicators: Red/green window per pole for easy checks
- DIN rail mounted: 54mm wide, compact fit for boards
What type of surge protection is this?
This is a Type 2 SPD, designed to protect against transient overvoltages from switching activity and indirect lightning strikes. It meets the 18th Edition requirements for most three-phase installations.
Is this SPD suitable for three-phase systems?
Yes - the 3-pole design protects all three live conductors (L1, L2, L3) in a three-phase system.
What’s the max surge capacity?
The WSPD340 handles 20kA nominal discharge and 40kA maximum discharge current.
- Type: Type 2 SPD
- Poles: 3 (L1, L2, L3)
- Nominal discharge current (In): 20kA
- Max discharge current (Imax): 40kA
- Voltage rating: 230/400V AC (Uc: 275V)
- Protection level: 1.5kV (Up)
- Indicator: Mechanical red/green per pole
- Terminals: 2.5–25mm² screw connection
- Mounting: 35mm DIN rail (symmetrical)
- Dimensions: 54mm (W) x 90mm (H) x 65mm (D)
- Operating temperature: -40°C to +85°C
- Protection rating: IP20
- Back-up fuse: 125A max. gL/gG
- Standards compliance: IEC 61643-11 / EN 61643-1
- SKU: WSPD340
Install the SPD as close as possible to the incoming supply or distribution board busbar to minimise lead lengths. Follow 18th Edition guidance on surge protection placement and ensure protective earth connections are kept short and direct.
- Mount directly on 35mm DIN rail
- Connect L1, L2, L3 via screw terminals (2.5–25mm²)
- Ensure effective bonding and earth connection
- Always install by a qualified electrician
