ETI KZS-2M differential circuit breaker 2P 25A C type A 10kA (2173236)

This ETI KZS-2M differential circuit breaker is designed for combined protection of electrical circuits against overload, short circuit, and leakage current. It is used in distribution boards in residential, commercial, and small industrial installations where the functions of an automatic circuit breaker and a residual current device need to be integrated into one module. Such a solution is suitable for protecting final single-phase circuits and improving the overall safety of the electrical system. The device is rated at 25 A and has a C tripping characteristic, which makes it appropriate for circuits with moderate inrush currents, such as supply lines for household equipment and general-purpose electrical loads. The 1+N pole configuration means one protected pole plus neutral, which is a common arrangement for single-phase networks. The rated residual current is 0.01 A, or 10 mA, so the breaker responds to very small leakage currents and provides a higher level of protection for the circuit. Type A indicates the ability to detect both sinusoidal alternating residual currents and pulsating direct residual currents. This is important for circuits that include electronic loads and equipment with rectifying elements. The breaking capacity of 10 kA allows the device to operate in networks with elevated short-circuit currents, disconnecting the faulty circuit according to the declared parameters. The rated frequency of 50/60 Hz makes the unit suitable for systems operating on either common mains frequency. The permitted conductor cross-section is 1–25 mm², which provides compatibility with a broad range of wiring sizes within project requirements. The product complies with IEC/EN 61009, the standard governing differential circuit breakers. Overall, the KZS-2M series model from ETI is intended for technical use in modular switchboards where compact combined protection and defined electrical characteristics are required.