4.9 Based on 1181 reviews 
Description
Industrial 3 Phase Lightning Surge Arrester with Window Indication
Surge Devices SY12350KA4P – Type 1+2+3 SPD for TT, TN-S & TNC-S Systems
Advanced Lightning & Surge Protection for Industrial Panels
The Surge Devices SY12350KA4P is a three phase lightning surge arrester with indication, designed for full Type 1+2+3 protection. Rated at 50kA, it’s capable of handling direct lightning strikes while protecting sensitive equipment in TT, TNC-S, and TN-S installations.
It offers excellent performance with a low let-through voltage, fast response, and pluggable modules for future maintenance.
Key Features
- Lightning and surge rating of 50kA (10/350μs)
- Combined Type 1+2+3 three phase SPD
- <1.3kV let-through voltage
- <25ns ultra-fast response time
- Remote contact for BMS/alarm connection
- Pluggable L and N/PE modules for easy swap
- Visual status window for on-site monitoring
- DIN rail mounted for fast installation
- Suitable for TT, TNC-S, and TN-S systems
- Backup protection: 63–160A fuse or MCB
- Made in Europe and fully BS7671 compliant
Technical Overview
- Part No: SY12350KA4P
- Voltage Rating (Uc): 275V AC
- Lightning Impulse Current (Iimp): 12.5kA per path
- Total Discharge (L1-L3+N to PE): 50kA
- Nominal Discharge (In): 20kA
- Max Discharge (Imax): 50kA
- Protection Level (Up): <1.3kV
- Response Time: <25ns
- TOV (UT): 335V / 5 sec
- Backup Fuse (max): 160A
- Recommended Cable Size: 16–25mm²
- Weight: 690g
- Mounting: 35mm DIN rail
- Spare Modules: SY12350KA4P/MOD/L & /MOD/NPE
What’s Included
- SY12350KA4P SPD unit
- Visual status window
- Remote changeover terminals
- Instruction leaflet
- Compatible with optional enclosures
Why Choose This Product?
This surge arrester offers reliable performance across all UK earthing systems. It’s DIN-rail ready, easy to maintain, and designed for quick response to both lightning and transient overvoltages. It’s a smart, future-proof choice for installers.
Guarantee & Compliance
Compliant with:
- BSEN62305
- BSEN61643-11
- BS7671 (18th Edition Wiring Regulations)
Summary
The Surge Devices SY12350KA4P delivers reliable Type 1+2+3 lightning and surge protection for three-phase panels. With quick response and pluggable modules, it’s ideal for TT, TNC-S, and TN-S installations.
Related Options in the SY12350KA4P Surge Devices Range
- Need a sealed version? See the SY12350KA4P/ENC – Type 1+2+3 SPD in IP65 Enclosure
- For added protection with MCB, view the SY12350KA4P/ENCM – SPD Kit with 63A Breaker in IP65 Housing
