Residual current circuit breaker with overcurrent protection KZS-4M 3p+N AC C25/0.03 002174026

Residual Current Circuit Breaker with Overcurrent Protection KZS-4M is a reliable and proven solution for protecting electrical installations. It is used to protect against electric shock, both in the case of direct and indirect contact with live parts, and also protects devices against fire hazard caused by insulation damage. Additionally, it provides protection against the effects of short circuits and overloads in electrical circuits.

This four-pole switch (3P+N) is designed for use in TN-S, TN-C-S, TT and IT networks, where the neutral and earth conductors are separated. It is characterized by high efficiency due to the use of characteristic C, which allows delayed tripping with short-term current surges – which is particularly important when starting devices with motors. The rated short-circuit breaking capacity at 6 kA guarantees effective disconnection of the circuit in the event of a failure.

The KZS-4M circuit breaker has a rated current of 25 A and a rated differential current of 0.03 A, making it suitable for protecting circuits with medium loads. It is sensitive to alternating (AC) differential currents, which provides effective protection against dangerous situations. The compact design – width of 4 modules and installation depth of 69 mm – makes it easy to mount in electrical distribution boards. The degree of protection IP20 provides basic protection against touch and ingress of solid objects.

Design and functional features:

• Number of poles: Four-pole design (3P+N) allows simultaneous disconnection of phases and neutral, providing comprehensive protection.
• Characteristic C: Provides delayed tripping with short-term overloads, ideal for circuits with devices with high inrush current (e.g., motors).
• Short-circuit breaking capacity: 6 kA guarantees safe disconnection of the circuit in the event of a short circuit.
• Wire cross-section: Possibility of connecting stranded wires with a cross-section of 1…35 mm² and solid wires 1…25 mm² provides installation flexibility.
• Safety of use: It has terminals protected against contact under voltage and the possibility of sealing the lever in the ON/OFF position for increased safety and to prevent accidental change of the switch status.
• Additional functions: Possibility of mounting auxiliary contacts PS KZS-2M/4M (available separately) expands the functionality of the circuit breaker.
• Testing: Equipped with a "Test" button allowing regular checking of the correct operation of the residual current device.
• Status indicator: It has an indicator of the position of the main contacts (ON/OFF) making it easier to identify the status of the switch.

The KZS-4M circuit breaker meets safety standards and is designed to operate at ambient temperatures from -25°C to 40°C and at a power supply frequency of 50/60 Hz. It is a solid and reliable device that will provide effective protection of the electrical installation and devices connected to it.