2173305 Диф. автоматичний вимикач KZS-2M B 20/0,3 тип AC (10kA)

The KZS-2M series differential automatic circuit breaker from ETI is designed to protect electrical circuits against overload, short circuit, and leakage currents. This type of device combines the functions of a miniature circuit breaker and a residual current device in one enclosure, which makes it suitable for distribution boards in residential, commercial, and small industrial installations where both overcurrent protection and fault-current monitoring are required. The model is rated for a nominal current of 20 A and uses tripping characteristic B. This characteristic is intended for circuits with moderate inrush currents, such as lighting lines and general-purpose socket circuits. The AC type indicates response to alternating residual current, so the device is used in networks where this type of leakage current is expected. The rated residual current is 0.3 A, or 300 mA, which should be selected according to the project requirements and the purpose of the protected line. The 1+N pole configuration means the breaker operates with a phase conductor and neutral, making it appropriate for single-phase circuits. The breaking capacity of 10 kA allows installation in systems where higher short-circuit currents may occur. In addition, the rated frequency of 50/60 Hz makes the device compatible with common AC power systems. The permissible conductor cross-section ranges from 1 mm² to 25 mm², which facilitates connection of wires within the specified limits during panel assembly. The device complies with IEC/EN 61009, the standard for differential automatic circuit breakers. This confirms its intended use in electrical installations where coordinated protection and disconnection of faulty circuits are required. Thanks to its combined protective functions, the breaker is suitable for safeguarding lighting circuits, socket groups, and individual loads in low-voltage networks, while maintaining the compact modular format expected for installation in a distribution cabinet.