Residual current circuit breaker with overcurrent protection KZS-4M 3P+N AC B20/0.03 002174005

Residual Current Circuit Breaker with overcurrent protection KZS-4M is a reliable and proven solution for protecting electrical installations. It serves to protect against electric shock, both in case of direct and indirect contact with live parts, and also protects devices against fire hazard caused by insulation damage. Additionally, it provides protection against the effects of short circuits and overloads in electrical circuits.

This four-pole switch (3P+N) is designed for use in TN-S, TN-C-S, TT and IT networks, where the neutral and earth conductors are separated. Its construction is based on a sensitive AC type residual current mechanism, which reacts to leakage currents of 0.03A. Characteristic B provides fast tripping in case of overloads and short circuits, which is particularly important in circuits with devices with high starting current. The rated short-circuit breaking capacity is 6kA at 400V.

Installation is simple thanks to a width of 4 modules and the possibility of connecting conductors with a cross-section from 1 mm² to 35 mm² (multi-strand) or 1 mm² to 25 mm² (solid). Equipped with a protection degree of IP20, it is resistant to finger touch. Additional features, such as a test button, contact position indicator and the possibility of sealing the lever, increase safety and convenience. The possibility of mounting auxiliary contacts PS KZS-2M/4M allows to expand the functionality of the switch.

• Provides comprehensive protection – against electric shock and the effects of overloads and short circuits.
• AC sensitivity – effectively detects alternating leakage currents.
• Characteristic B – ideal for circuits with devices generating inrush currents at start-up (e.g. motors).
• Easy installation – 4 module width makes installation in a distribution board easier.
• Safety of use – equipped with a test button and contact position indicator.
• Expandability – compatible with auxiliary contacts PS KZS-2M/4M.
• Compliance with standards - ensures safe operation of the electrical installation in accordance with applicable regulations.

The KZS-4M switch is a solid and reliable device that will meet the expectations of both professional installers and end users looking for effective protection for their electrical installations. Its compact dimensions (installation depth 69mm) allow for mounting even in limited space of the distribution board.