Residual current circuit breaker with overcurrent protection KZS-2M AC B20/0.03 002173105

Reliable protection of electrical installations

Residual current circuit breaker with overcurrent protection KZS-2M AC B20/0.03 is a comprehensive solution providing protection for people and devices in electrical installations. It combines the functions of an overcurrent and residual current circuit breaker, offering effective protection against electric shock, short circuits and overloads. It is a key safety element in every home and workplace.

Functionality 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 the effects of direct or indirect contact with live parts and against the risk of fire caused by insulation damage. This ensures a high level of safety when using the electrical installation. The rated current of 20A and characteristic B make the circuit breaker ideal for circuits with moderate inrush current, e.g. lighting or sockets.

Key features and benefits

• Combination of two functions: Overcurrent and residual current protection in one device – saves space in the distribution board and simplifies installation.
• High sensitivity: Rated differential current of 0.03A ensures a quick response to leakage currents, minimizing the risk of electric shock.
• Type AC: Detects alternating currents, which is standard for most domestic and industrial applications.
• Rated short-circuit breaking capacity 10kA: Ensures effective disconnection of the circuit in the event of a short circuit, protecting the remaining elements of the installation.
• Width of 2 modules: Compact dimensions make it easy to install even in tight distribution boards.
• Connection conductor cross-section 1…25 mm²: Versatility of connecting cables of different thicknesses.
• Protection class IP20: Protection against finger contact and against the ingress of solid objects larger than 12.5 mm.
• Possibility of mounting auxiliary contacts PS KZS-2M/4M: Expansion of the device's functionality (available separately).

Technical parameters in practice

The KZS-2M AC B20/0.03 circuit breaker is characterized by a rated voltage of 230V and a frequency of 50Hz – standard parameters for Polish electrical installations. Its installation depth is 69mm, which should be taken into account when planning space in the distribution board. Energy limitation class 3 indicates a good ability to withstand short-circuit energy without damage. The rated insulation voltage Ui is 500V, which ensures a high level of insulation safety. At the same time, the disconnectable N pole increases the safety of using the device and the entire electrical circuit.