Phoenix Contact 2904374 Typ 2 prepäťová ochrana, 3+1 pól, 275 V AC, 40 kA, DIN lišta

In industrial control cabinets and building installations, electrical equipment faces constant risk from transient overvoltages caused by lightning strikes or switching operations. The Phoenix Contact 2904374 surge protective device (SPD) is a Type 2 arrester designed to safeguard sensitive electronics in three-phase power supply systems. With a nominal voltage of 230 V AC and a maximum continuous operating voltage of 275 V AC, it provides reliable protection for downstream devices. The unit features a 3+1 circuit configuration, protecting all live conductors (L1, L2, L3) against neutral and protective earth, as well as neutral against protective earth. Its high discharge capacity of up to 40 kA (8/20 µs) and low voltage protection level of ≤1.3 kV ensure effective surge suppression. The device is equipped with a floating changeover contact for remote status signaling, allowing integration into building management systems. Visual status indication via a mechanical flag provides immediate on-site diagnostics. Installation is straightforward on standard 35 mm DIN rails, and screw terminals accept conductors from 1.5 mm² to 35 mm² (solid) or 25 mm² (flexible). The compact housing (22.5 mm width) saves space in distribution boards. Compliant with IEC 61643-11 and EN 61643-11, this SPD is suitable for use in industrial, commercial, and residential applications where reliable surge protection is essential.

Key specifications

• Type 2 surge protective device according to IEC 61643-11
• Nominal voltage: 230 V AC; max continuous operating voltage: 275 V AC
• Nominal discharge current: 20 kA (8/20 µs); max discharge current: 40 kA (8/20 µs)
• Voltage protection level: ≤ 1.3 kV; response time: ≤ 25 ns
• Number of poles: 3+1 (protection paths: L-N, L-PE, N-PE)
• Remote signaling contact: floating changeover contact
• Operating temperature: -25 °C to 70 °C; storage: -40 °C to 85 °C
• Degree of protection: IP20; mounting: 35 mm DIN rail
• Connection: screw terminals, 1.5–35 mm² solid / 1.5–25 mm² flexible
• Status indication: optical, mechanical flag

Why choose it

This SPD offers robust protection against transient overvoltages, reducing downtime and equipment damage. Its high discharge capacity and fast response time make it suitable for areas with high lightning activity. The integrated remote signaling contact enables proactive maintenance by alerting personnel when the protection module needs replacement. The compact design and simple screw connections speed up installation, while the clear visual indicator allows quick status checks without tools.

Ideal use cases

• Protection of three-phase power supplies in industrial control panels
• Surge protection for building automation systems and HVAC controls
• Safeguarding sensitive electronic equipment in commercial facilities
• Retrofit installations in existing distribution boards with limited space

Good to know

The device is designed for use in TN-S and TT power supply systems. It must be installed by qualified personnel in accordance with local regulations. The remote signaling contact is a floating changeover contact, which can be wired to a PLC or monitoring relay. The module is replaceable, but the base remains on the DIN rail, simplifying maintenance. Always disconnect power before installation or service.