DEHN DEHNguard MP TNS 275 FM Type 2 Surge Arrester, 4-Pole, 275V, 40kA, DIN Rail 942405

With a maximum discharge current of 40 kA (8/20 µs) and a voltage protection level of ≤ 1.3 kV, the DEHNguard MP TNS 275 FM (942405) provides reliable protection for TN-S power supply systems against transient overvoltages.

Overview

The DEHNguard MP TNS 275 FM is a modular Type 2 surge protective device designed for use in TN-S earthing systems. It features a nominal voltage of 230/400 V AC and a maximum continuous operating voltage of 275 V AC, making it suitable for a wide range of low-voltage installations. The device is equipped with a potential-free changeover contact for remote signaling, allowing integration into monitoring systems.

What stands out

• High discharge capacity: 20 kA nominal (In) and 40 kA maximum (Imax) per mode.
• Fast response time of ≤ 25 ns, ensuring minimal let-through energy.
• Compact 4-module DIN rail design for easy installation.
• Follow current extinguishing capability: no follow current, enhancing safety.
• Wide operating temperature range from -40 °C to +80 °C.

Technical details

• SPD type: Type 2 / Class II
• Earthing system: TN-S
• Nominal voltage (Un): 230 / 400 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: ≤ 1.3 kV
• Response time (tA): ≤ 25 ns
• Max. back-up fuse: 125 A gG
• Short-circuit withstand capability: 50 kA rms
• Remote signaling contact: potential-free changeover
• Mounting: 35 mm DIN rail
• Number of modules: 4 TE
• Degree of protection: IP20
• Connection terminals: max. 35 mm² stranded / 25 mm² flexible
• Housing material: thermoplastic, red, UL 94 V-0

Our verdict

The DEHNguard MP TNS 275 FM is a robust and high-performance surge arrester for TN-S systems, offering excellent protection with a compact footprint and reliable remote signaling.