Surge protective device B+C 1P (T1+T2 AC) BY7-40/1-275 87.780

Professional surge protection in a compact form

The BY7-40/1-275 surge protective device is an advanced Class B+C (Type 1+2) device that provides comprehensive protection for electrical installations against harmful surges originating from both the power grid and atmospheric discharges. By combining spark gap and varistor technologies in a single module, the device effectively eliminates both high-energy surges (Class T1) and lower transient voltages (Class T2).

Technical parameters and protective performance

The device is characterized by an impulse current Iimp of 5 kA at a 10/350 μs pulse, making it suitable for protection against direct lightning strikes. The maximum current Imax reaches 40 kA, and the nominal current In is 20 kA, ensuring high performance under normal operating conditions.

The maximum continuous operating voltage Uc is 275 VAC, with a rated AC voltage of 230 V. An Up protection level of 1.2 kV guarantees effective separation of the protected installation from harmful surge voltages.

Construction and installation compatibility

The surge protector occupies only one module on a TH35 rail (18 mm width), allowing for economical space management in electrical distribution boards. The device supports flexible conductor cross-sections from 2.5 to 35 mm² as well as solid single-wire or multi-wire conductors within the same cross-section range.

The design is adapted for TN network systems and provides optical status signaling, enabling easy monitoring of the device's condition without the need for additional signaling accessories.

Regulatory compliance and operational safety

The product meets the requirements for Type 1+2 protection class according to current European standards, as confirmed by the CE declaration included in the technical documentation. The enclosure protection rating is IP20, ensuring safe installation inside electrical distribution boards.

The device is covered by customs codes 85363090/85363030 as a component of grounding and surge protection systems. The compact design (81×18×70 mm) and a net weight of 0.1 kg facilitate transport and installation in various electrical installation applications.