Residual current circuit breaker with overcurrent protection KZS-4M 3P+N A C32/0.03 002174927

Residual Current Device with Overcurrent Protection KZS-4M is a comprehensive solution ensuring the safety of electrical installations and protecting against the effects of electric shock and damage caused by overloads and short circuits. The device combines the functions of an overcurrent and residual current circuit breaker, simplifying the installation and reducing the number of components needed. This is particularly important in new installations, but also when modernizing older facilities.

Protection and Application

The KZS-4M circuit breaker is designed for use in TN-S, TN-C-S, TT and IT circuits, where the neutral and earth conductors can be separated or combined. It provides protection against:

• Electric shock: thanks to the residual current function, which quickly disconnects the circuit in the event of a ground fault current.
• Overloads: the overcurrent function protects against damage to wires and devices caused by excessive current draw.
• Short circuits: rapid disconnection of the circuit in the event of a short circuit minimizes the risk of fire and equipment damage.
• Fire hazard: by cutting off the power supply in the event of insulation failure.

Characteristics and Parameters

The KZS-4M 3P+N circuit breaker with a rated current of 32A and C characteristic is ideal for protecting circuits with receivers with high inrush current, such as motors or heating devices. Characteristic C allows for momentary exceeding of the rated current without unnecessary tripping of the circuit breaker, ensuring reliable system operation. The rated residual current of 0.03A (30mA) ensures high effectiveness of protection against electric shock. The rated current is 32A, the rated voltage is 400V, and the rated breaking capacity is 6kA. The device has a sensitivity of A and is characterized by a width of 4 modules. The circuit breaker is four-pole (3P+N).

Construction and Installation

The KZS-4M circuit breaker has a compact design occupying 4 modules in width, making it easy to install in electrical distribution boards. It has a protection degree of IP20, which provides protection against accidental contact. The connection terminals allow connection of wires with a cross-section from 1 to 25 mm², both solid and stranded. Additional functions such as the possibility of sealing the lever and mounting auxiliary contacts increase the functionality of the device and adapt it to the specific requirements of the installation. A test button allows for regular checking of the correct operation of the residual current circuit breaker, which is crucial for ensuring continuous protection.