Residual current circuit breaker ETI KZS-1M UNI 1P+N 25A B type AC 6kA (2176106)

The ETI KZS-1M UNI residual current circuit breaker is designed to protect electrical lines from overload, short circuit, and leakage current. It is used in distribution boards of residential, commercial, and general-purpose electrical installations where combined protection in one modular device is required. The 1P+N configuration allows control of the phase conductor and neutral conductor in a compact format suitable for DIN-rail modular mounting. With a rated current of 25 A, the device is intended for individual circuits with medium load. Trip characteristic B makes it suitable for lines with relatively low inrush currents, which is why it is commonly used for lighting circuits, socket circuits, and similar standard household or office applications. The residual current sensitivity of 0.01 A provides a high level of protection against dangerous leakage currents and helps improve electrical safety during operation. Type AC means the device responds to sinusoidal alternating residual current, which corresponds to typical AC network conditions. The breaking capacity of 6 kA allows the circuit breaker to disconnect the circuit under significant short-circuit current within the specified limits. The rated frequency of 50/60 Hz ensures compatibility with common electrical networks, while compliance with EN/IEC 61009-1 confirms that the device belongs to this class of protective apparatus. The parameter list also specifies a nominal cross-section of 110 mm², which should be taken into account during installation design and when selecting associated connection accessories. The UNI series format is intended for practical integration into modular switchboards, combining overcurrent protection and residual current protection in a single unit. This makes the device suitable for local protection of final circuits where compact installation and functional combination are required.