Differential circuit breaker ETI KZS-2M 2P C 16A/0.3A type AC 10kA (2173324)

This differential circuit breaker from ETI’s KZS-2M series is designed for combined protection of electrical circuits against overload, short circuit, and residual current leakage. It is used in distribution boards of residential, commercial, and domestic electrical installations where both the functions of an automatic circuit breaker and a residual current device are required in a single modular unit. The 1+N pole configuration makes it suitable for single-phase circuits with a neutral conductor. The rated current of 16 A makes the device appropriate for protecting lighting circuits, socket outlets, and other loads with moderate power demand. The C tripping characteristic indicates that the breaker is intended for circuits with higher inrush currents, including equipment that briefly draws more current during startup. The residual current rating of 0.3 A provides protection by detecting leakage currents that may indicate insulation damage or a fault in the circuit. Type AC means the device is designed to respond to sinusoidal alternating residual current. This makes it suitable for typical AC network conditions. With a breaking capacity of 10 kA, the unit can be used in installations where a higher prospective short-circuit current may occur. The rated frequency of 50/60 Hz supports operation in commonly used power systems. The permissible conductor cross-section range of 1–25 mm² simplifies connection of different cable sizes within the constraints of the distribution board wiring. The device complies with IEC/EN 61009, the standard for differential circuit breakers, confirming its intended application in modern modular switchboard assemblies. As a compact combined protective device, the ETI KZS-2M helps reduce the number of separate components in the board while maintaining functional separation of overload, short-circuit, and earth-leakage protection. It is a practical solution for protecting individual consumer groups where space efficiency and unified protection in one enclosure are important.