Residual current circuit breaker with overcurrent protection KZS-4M 3P+N AC C32/0.03 002174027

Residual Current Breaker KZS-4M 3P+N AC C32/0.03 is a reliable device used for comprehensive protection of electrical circuits. It combines the functions of an overcurrent and residual current breaker, ensuring the safety of people and installations from the effects of electric shock, short circuits and overloads. It is a key element of every modern electrical installation, both in residential and commercial buildings.

Protection and Application

The device is intended for use in TN-S, TN-C-S, TT and IT networks, where the neutral and earth conductors are separated. It protects against electric shock due to direct or indirect contact with live parts and protects devices from damage caused by short circuits and overloads. Thanks to its C characteristic, the breaker copes well with impulse loads, such as starting motors or devices with heating elements – allowing smooth start-up without unnecessary circuit disconnection. The rated residual current of 0.03A ensures a quick response to earth leakage currents, minimizing the risk of electric shock.

Construction and Installation

The KZS-4M breaker occupies 4 modules in width, making it easy to install in standard distribution boards. It has a protection degree of IP20, which means protection against touching with a finger and against the ingress of solid objects larger than 12.5 mm. The cross-section of the connected solid wire is from 1 to 25 mm², and the stranded wire from 1 to 35 mm², which provides flexibility when selecting supply wires. The integrated N pole (neutral) allows simultaneous disconnection of the phase and neutral in the event of a dangerous situation. Additionally, the device has a test button allowing regular checking of its functionality.

Technical Parameters in Practice

• Rated current 32A: Means that the breaker can safely handle a load with a maximum current of 32 amps under normal operating conditions.
• Rated residual current 0.03A: Detects even small leakage currents (30mA), which is crucial for protection against electric shock.
• Characteristic C: Provides delayed tripping with short-term overloads (e.g. when starting a motor), preventing unnecessary circuit disconnections.
• Rated short-circuit breaking capacity 6kA: The breaker is able to safely interrupt a short circuit with a current of up to 6 kA, protecting the installation from serious damage.
• Frequency 50/60 Hz: The device works with networks with a frequency of 50 or 60 Hz, making it a universal solution for different geographical locations.