ETI KZS-2M Differential Circuit Breaker 2P B 40A 30mA Type AC 10kA (2173108)

This differential circuit breaker from ETI’s KZS-2M series is designed to protect electrical circuits against overload, short circuit, and earth leakage currents. It is used in distribution boards of residential, administrative, and commercial premises where combined protection by an automatic circuit breaker and a residual current device is required in one module assembly. The 1+N pole configuration allows monitoring of the phase conductor and neutral, which is especially practical for single-phase lines. The device is rated at 40 A, with a residual current sensitivity of 0.03 A, or 30 mA. This sensitivity level is intended for additional personal protection against electric shock and helps improve the safety of the installation. The B tripping characteristic is suitable for circuits with moderate inrush currents, such as lighting circuits and socket groups without significant impulse loads. The 10 kA breaking capacity enables interruption of the circuit under high short-circuit currents, which is important in installations where elevated fault currents may occur. This device operates in AC systems at a rated frequency of 50/60 Hz, so it can be used in common alternating-current networks. The nominal conductor cross-section range of 1 to 25 mm² provides flexibility during installation and allows the breaker to be matched to the cable size and project requirements. Compliance with IEC/EN 61009 confirms that the product meets the standard requirements for differential circuit breakers. ETI KZS-2M is suitable for modular switchboard applications where compact design, functional circuit protection, and conformity with electrical standards are required. It is a practical solution for protecting final circuits in homes, offices, and small commercial facilities, especially where both overload protection and residual current protection must be combined in a single device.