Dehn Type 2 Surge Arrester DG S 275 FM

Protect your electrical installations from transient overvoltages caused by lightning strikes or switching operations with the Dehn Type 2 Surge Arrester DG S 275 FM. This varistor-based surge protective device (SPD) is designed for installation in low-voltage systems to safeguard sensitive equipment and prevent costly downtime.

Who is it for

Electricians, panel builders, and facility managers seeking reliable surge protection for residential, commercial, and industrial applications. The DG S 275 FM is suitable for use in main distribution boards and sub-distribution boards where a Type 2 SPD is required according to IEC 61643-11.

Main features

• Type 2 surge protection according to EN 61643-11
• High discharge capacity: nominal discharge current (In) 20 kA (8/20 µs), maximum discharge current (Imax) 40 kA (8/20 µs)
• Low voltage protection level (Up) ≤ 1.2 kV for effective equipment protection
• Fast response time < 25 ns
• Visual status indicator: green = operational, red = faulty
• Remote signaling contact (potential-free changeover) for remote monitoring
• Compact 1-pole design for 35 mm DIN rail mounting
• Wide operating temperature range: -40 °C to +80 °C
• Thermoplastic housing, UL 94 V-0 flame retardant

Specifications

• SPD type: Type 2
• Nominal voltage (Un): 230 V AC (50/60 Hz)
• Max. continuous operating voltage (Uc): 275 V AC (50/60 Hz)
• Nominal discharge current (In) (8/20 µs): 20 kA
• Max. discharge current (Imax) (8/20 µs): 40 kA
• Voltage protection level (Up) at In: ≤ 1.2 kV
• Response time (tA): < 25 ns
• Follow current extinguishing capability (Ifi): 100 A a.c.
• Short-circuit withstand capability (Isccr): 50 kA_rms (with max. backup fuse)
• Max. backup fuse: 125 A gG
• Mounting: 35 mm DIN rail
• Number of poles: 1
• Protection mode: L-N / L-PE
• Operating temperature range: -40 °C to +80 °C
• Degree of protection: IP20
• Remote signaling contact: Yes (potential-free changeover)
• Visual status indicator: Yes (green/red)
• Standards: EN 61643-11, IEC 61643-11
• Housing material: Thermoplastic, UL 94 V-0
• Technology: Varistor-based

Tips

For optimal protection, install the DG S 275 FM as close as possible to the incoming power supply. Ensure proper coordination with upstream and downstream SPDs. Regularly check the visual indicator and replace the module if it shows red.