DEHNguard DG M TNS ACI 275 FM Type 2 Surge Arrester 4-Pole 275V

With a maximum discharge current of 40 kA and a voltage protection level of ≤1.5 kV, the DEHNguard DG M TNS ACI 275 FM delivers robust surge protection for TNS power systems. This Type 2 surge protective device (SPD) safeguards electrical installations from transient overvoltages, ensuring operational continuity and equipment longevity.

Overview

The DEHNguard DG M TNS ACI 275 FM is a 4-pole surge arrester designed for mounting on 35 mm DIN rails. It features Advanced Circuit Interruption (ACI) technology, which provides superior follow current extinguishing capability and enhances system safety. The device is compliant with IEC 61643-11 and EN 61643-11 standards, making it suitable for a wide range of industrial and commercial applications.

What stands out

• High discharge capacity: nominal 20 kA, maximum 40 kA (8/20 µs)
• Low voltage protection level: ≤1.5 kV for sensitive equipment protection
• ACI technology for reliable follow current interruption up to 100 A AC
• Remote signalling via floating changeover contact for monitoring
• Wide operating temperature range: -40 °C to +80 °C
• Compact DIN rail mountable design with IP20 protection

Technical details

• SPD type: Type 2
• Network configuration: TNS
• Number of poles: 4
• Max. continuous operating voltage (Uc): 275 V AC
• Nominal discharge current (In) (8/20 µs): 20 kA
• Max. discharge current (Imax) (8/20 µs): 40 kA
• Voltage protection level (Up): ≤1.5 kV
• Follow current extinguishing capability (Ifi): 100 A AC
• Response time (tA): < 100 ns
• Short-circuit withstand capability (Isccr): 50 kA rms (with max. backup fuse)
• Backup fuse (L-L/L-N): 125 A gG
• Operating temperature range: -40 °C to +80 °C
• Enclosure material: Thermoplastic (UL 94 V-0)
• Protection class: IP20
• Remote signalling: Yes (floating changeover contact)
• Technology: ACI (Advanced Circuit Interruption)
• Standards compliance: IEC 61643-11 / EN 61643-11
• Mounting: 35 mm DIN rail

Our verdict

The DEHNguard DG M TNS ACI 275 FM is a high-performance Type 2 surge arrester that combines robust protection with advanced interruption technology, making it an excellent choice for safeguarding sensitive equipment in industrial and commercial TNS systems.