DEHN 951405 Modular Combined Arrester for TN-S Systems FM IP20

With a lightning impulse current of 25 kA and voltage protection level ≤ 1.5 kV, the DEHN 951405 modular combined arrester provides robust protection for TN-S power supply systems.

Overview

The DEHN 951405 is a Type 1 + Type 2 combined surge protective device designed for TN-S systems. It features a spark gap technology and is suitable for DIN rail mounting. The unit has a nominal voltage of 230/400 V AC and a maximum continuous operating voltage of 255 V AC. It offers a total lightning impulse current of 25 kA (10/350 µs) and a total nominal discharge current of 80 kA (8/20 µs). The voltage protection level is ≤ 1.5 kV, and the response time is less than 100 ns. The arrester has 3+1 poles (3 phase + N-PE) and a module width of 4.5 TE (81 mm). It includes remote signaling via a potential-free changeover contact. The enclosure protection rating is IP20, and the operating temperature range is -40 °C to +80 °C. The device complies with IEC 61643-11 and EN 61643-11.

What stands out

• High lightning impulse current: 25 kA total (7.5 kA per pole)
• Low voltage protection level: ≤ 1.5 kV
• Fast response time: < 100 ns
• Remote signaling contact for status monitoring
• Compact DIN rail mounting (4.5 TE width)

Technical details

• Arrester type: Type 1 + Type 2 combined arrester
• System configuration: TN-S
• Nominal voltage (Un): 230 / 400 V AC
• Max. continuous operating voltage (Uc): 255 V AC
• Lightning impulse current (Iimp) (10/350 µs): 25 kA total / 7.5 kA per pole
• Nominal discharge current (In) (8/20 µs): 80 kA total / 20 kA per pole
• Voltage protection level (Up): ≤ 1.5 kV
• Follow current extinguishing capability (Ifi): 50 kA rms
• Response time (tA): < 100 ns
• Number of poles: 3+1 (3 phase + N-PE)
• Mounting type: DIN rail (35 mm)
• Module width: 4.5 TE (81 mm)
• Enclosure protection rating: IP20
• Operating temperature range: -40 °C to +80 °C
• Remote signaling: Yes (potential-free changeover contact)
• Short-circuit withstand capability (Isccr): 50 kA rms (with max. back-up fuse)
• Standards compliance: IEC 61643-11, EN 61643-11
• Technology: Spark gap based

Our verdict

The DEHN 951405 is a high-performance surge protective device for TN-S systems, offering robust protection with comprehensive technical specifications and remote monitoring capability.