Residual current circuit breaker with overcurrent protection KZS-4M 3p+N AC B25/0.03 002174006

Residual Current Circuit Breaker with Overcurrent Protection KZS-4M is a reliable device that combines protection against electric shock and protection against overloads and short circuits. It is a key element of any electrical installation, ensuring the safety of people and equipment. This model, with characteristic B and rated current of 25A, is perfect for circuits requiring a quick reaction to current increase, e.g., with devices with high inrush current.

Features and application

The KZS-4M circuit breaker is designed for use in TN-S, TN-C-S, TT and IT networks, where the neutral and earth conductors are separated. Its four-pole (3P+N) construction provides comprehensive protection for the entire circuit. The rated short-circuit breaking capacity of 6kA guarantees effective disconnection in the event of a serious failure. AC sensitivity means that the circuit breaker reacts to alternating differential currents, which is standard in most domestic and industrial applications.

Advantages and benefits

• Versatility: combining the functions of a residual current circuit breaker and an overcurrent circuit breaker in one device simplifies installation and reduces costs.
• Safety: provides protection against electric shock and damage caused by short circuits and overloads.
• High reliability: made of high-quality materials, guarantees long-lasting and trouble-free operation.
• Easy installation: 4-module width makes it easy to install in standard distribution boards.
• Test button: allows the user to regularly check the functionality of the residual current circuit breaker.
• Wide connection range: accepts multi-strand conductors with a cross-section of 1 to 35 mm² and solid conductors from 1 to 25 mm², providing flexibility in cable selection.

Construction and parameters

The circuit breaker is characterized by energy limitation class 3, which means its ability to withstand high short-circuit energies without damage. The degree of protection IP20 provides protection against accidental contact, but does not protect against the effects of water. The cross-section of the connecting conductor has been selected to ensure a safe connection to the electrical installation. The rated AC voltage is 400V at a frequency of 50/60Hz - standard for most power networks in Poland and Europe. This makes the circuit breaker compatible with most electrical installations available on the market.