4.9 Based on 1181 reviews 
Description
Combined T1+T2 Protection – Ideal for TT Systems with External Lightning Risk
The Live Electrical ST1-12.5 4 Pole Type 1+2 SPD Surge ProtectIon is a compact 4-module surge protector that combines Type 1 and Type 2 protection in a single unit. Designed for installations exposed to direct lightning or high-energy surges, it is particularly suited for TT earthing systems.
With a discharge capacity of up to 30kA and 12.5kA lightning impulse rating, this device provides comprehensive protection for both residential and commercial three-phase installations. A visual flag indicator alerts users to status changes, and the unit complies with BS EN 61643-11 for surge protection standards.
⚙️ Key Features – ST1-12.5 SPD
- Combined Type 1 + Type 2 SPD – Protects against direct lightning and secondary switching surges
- Designed for TT Systems – Perfect for installations requiring T1+T2 protection
- High Discharge Capacity – 30kA max discharge (L-N/N-PE), 12.5kA impulse (Iimp)
- Protection Level – <2.0kV for both L-N and N-PE
- Visual Flag Indicator – Green = Active, Red = Replace
- Compact Size – Only 72mm (4 modules) wide
- DIN Rail Mounting – Standard 35mm rail for easy installation
- Operating Range – -40°C to +80°C
- Terminal Capacity – 6mm² to 35mm² with 2.5Nm torque
- Compliance – BS EN 61643-11 & IEC/EN 61643-11
📐 Dimensions
- Width: 72mm (4 module)
- Height: 81mm
- Depth: 90mm
📝 Summary – 4 Pole Type 1+2 SPD Surge Protection
The ST1-12.5 offers reliable Type 1 and 2 surge protection in one unit, ideal for TT systems and areas with a higher risk of lightning. It’s easy to install, DIN rail mounted, and meets all BS EN standards.
