DEHN DG M TT 275 FM 230/400V Red Surge Arrester Modular Type 2 SPD for TN-C Systems (952315)

Electrical surges from lightning or switching operations can destroy sensitive equipment in an instant. The DEHN DG M TT 275 FM modular surge arrester provides reliable protection for 230/400 V three-phase systems, diverting dangerous overvoltages safely to ground and keeping your installation operational.

Who is it for

This Type 2 surge protective device is intended for use in commercial and industrial electrical installations, particularly in TN-C systems. It is ideal for electricians, panel builders, and facility managers who need to safeguard distribution boards, machinery, and control systems against transient overvoltages. Its modular design and clear fault indication make it suitable for both new installations and retrofits.

Main features

• Type 2 surge protection according to IEC 61643-11 and EN 61643-11.
• High discharge capacity: nominal 20 kA (8/20 µs), maximum 40 kA (8/20 µs).
• Low voltage protection level ≤ 1.2 kV, fast response < 25 ns.
• Visual status indication: green = OK, red = fault, for quick inspection.
• Integrated thermal disconnect device for safe end-of-life behavior.
• Compact 3-pole design for 35 mm DIN rail mounting.
• Wide operating temperature range from -40 °C to +80 °C.
• Robust thermoplastic housing, UL 94 V-0 flame retardant.

Specifications

• System configuration: TN-C
• Nominal voltage: 230 / 400 V AC (50/60 Hz)
• 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): ≤ 1.2 kV
• Response time (tA): < 25 ns
• Number of poles: 3-pole
• Mounting type: 35 mm DIN rail
• Degree of protection: IP20
• Operating temperature range: -40 °C to +80 °C
• Housing material: Thermoplastic, UL 94 V-0
• Connection type: Screw terminals
• Max conductor cross-section (solid): 35 mm²
• Max conductor cross-section (stranded): 25 mm²

Tips

For optimal protection, install the surge arrester as close as possible to the incoming power supply of the distribution board. Ensure proper grounding and follow local wiring regulations. Regularly check the visual status indicator to confirm the device is operational; if the indicator shows red, replace the module immediately to maintain protection.