DEHNguard MP TT ACI 275 FM Type 2 Surge Arrester 942341

Electrical surges can destroy sensitive equipment in an instant. The DEHNguard MP TT ACI 275 FM Type 2 Surge Arrester protects low-voltage consumer systems from transient overvoltages caused by indirect lightning strikes or switching operations. It is designed for use in TT and TN-S earthing systems and provides a 3+1 protection configuration for L1, L2, L3 and N-PE.

Who is it for

This surge arrester is intended for electricians and panel builders who need reliable surge protection in residential, commercial and industrial installations. It is suitable for main distribution boards and sub-distribution boards where Type 2 surge protection is required according to IEC 61643-11.

Main features

• Type 2 surge protection according to EN 61643-11 / IEC 61643-11
• Max. continuous operating voltage Uc: 275 V AC
• Nominal discharge current (8/20 µs): 20 kA
• Max. discharge current (8/20 µs): 40 kA
• Voltage protection level Up: ≤ 1.2 kV at In, ≤ 1.0 kV at 5 kA
• Advanced Circuit Interruption (ACI) technology for safe operation
• Remote signalling via floating changeover contact
• Mounts on 35 mm DIN rail, width 4 TE (72 mm)
• Short-circuit withstand capability: 50 kA rms with 125 A gG backup fuse
• Follow current extinguishing capability: 100 A rms
• Response time: < 100 ns
• Operating temperature range: -40 °C to +80 °C
• Degree of protection: IP20

Tips

Install the DEHNguard MP TT ACI 275 FM in the main distribution board to protect downstream equipment. Ensure proper earthing and use a suitable backup fuse as specified. The remote signalling contact allows integration into building management systems for status monitoring.