DEHN DSH B TNC 255 FM Type 1+2 Combined Surge Arrester for TN-C Systems, 3-Pole, 255 V AC, 25 kA (10/350 µs), Remote Signalling 941306

Protecting electrical installations in TN-C networks from lightning strikes and switching overvoltages requires a surge protective device that combines high discharge capacity with reliable follow current extinguishing. The DEHN DSH B TNC 255 FM is a Type 1+2 combined arrester engineered for exactly this task, offering a total lightning impulse current of 100 kA (10/350 µs) and a voltage protection level of ≤ 1.5 kV.

Who is it for

This arrester is intended for use by electrical engineers, panel builders, and facility managers responsible for the lightning protection of low-voltage consumer installations. It is suitable for TN-C systems with a nominal voltage of 230/400 V AC and can be installed at the boundary between lightning protection zones 0 and 1, or in the main distribution board.

Main features

• Type 1+2 combined arrester per EN 61643-11 / IEC 61643-11
• Designed for TN-C network systems (3-pole, no neutral)
• Max. continuous operating voltage U_C: 255 V AC
• Lightning impulse current I_imp: 25 kA per pole (10/350 µs), total 100 kA
• Nominal discharge current I_n: 25 kA (8/20 µs)
• Voltage protection level U_p: ≤ 1.5 kV
• Follow current extinguishing capability I_fi: 50 kA rms
• Short-circuit withstand capability I_SCCR: 50 kA rms with max. backup fuse 315 A gL/gG
• Response time t_A: < 100 ns
• Potential-free remote signalling contact (changeover) for status monitoring
• Mounts on 35 mm DIN rail, IP20 protection, thermoplastic housing UL 94 V-0
• Operating temperature range: -40 °C to +80 °C

Specifications

• Brand: DEHN
• Model: DSH B TNC 255 FM
• MPN: 941306
• EAN: 4013364328068
• SPD Type: Type 1+2 combined arrester
• Network system: TN-C
• Nominal voltage U_N: 230/400 V AC
• Max. continuous operating voltage U_C: 255 V AC
• Lightning impulse current I_imp (10/350 µs): 25 kA per pole, 100 kA total
• Nominal discharge current I_n (8/20 µs): 25 kA
• Voltage protection level U_p: ≤ 1.5 kV
• Follow current extinguishing capability I_fi: 50 kA rms
• Short-circuit withstand capability I_SCCR: 50 kA rms
• Max. backup fuse: 315 A gL/gG
• Response time t_A: < 100 ns
• Number of poles: 3
• Remote signalling contact: Yes (potential-free changeover)
• Mounting: 35 mm DIN rail
• Degree of protection: IP20
• Housing material: Thermoplastic, UL 94 V-0
• Operating temperature range: -40 °C to +80 °C

Tips

For optimal protection, install the arrester as close as possible to the service entrance and keep connecting leads short. The remote signalling contact can be wired to a monitoring system to alert when a protective module needs replacement.