SZ203-B16 overcurrent circuit breaker, 3P, B characteristic, 16A, 6kA, AC 2CDS253025R0165

Overcurrent circuit breakers – reliable protection for electrical installations

This three-pole circuit breaker from ABB, from the SZ203-B16 series, is a key element of every safe electrical installation. It provides effective protection against overloads and short circuits, protecting both devices and users. Characteristic B makes it ideal for circuits with inductive or capacitive loads, as well as where short-term current surges occur – for example, when switching on motors.

This circuit breaker is designed for mounting on a 35mm DIN rail and is characterized by high reliability and durability. Its compact dimensions (3 module width) allow for efficient use of space in the switchgear cabinet. The rated short-circuit breaking capacity of 6kA at 230V and 400V guarantees a quick response in the event of a failure.

Application and benefits for professionals:

• Quick installation: Easy installation on a standard 35mm DIN rail saves time during construction or modernization of the installation.
• High selectivity: Characteristic B ensures coordinated operation with other protection devices in the installation, minimizing the risk of unnecessary disconnection of the entire circuit.
• Wide range of wire cross-sections: The ability to connect wires with a cross-section from 0.75 mm² to 35 mm² (solid) and 0.75 mm² to 25 mm² (stranded) provides flexibility when selecting appropriate cables.
• Compliance with standards: Meets the requirements of EN 60898, which guarantees safety and compliance with applicable regulations.

Construction features and user parameters:

The SZ203-B16 circuit breaker has been designed for long-term and trouble-free operation. The degree of protection IP20 provides protection against accidental contact and against the ingress of solid objects larger than 12.5 mm. The ambient temperature in operating conditions is from -25°C to +55°C, which allows it to be used in various environmental conditions. The rated insulation voltage Ui is 440V and the rated impulse withstand voltage Uimp is 4kV, which further increases safety. The overvoltage category is III, and the pollution degree is II – these parameters determine the circuit breaker's resistance to disturbances in the electrical network.

This circuit breaker is an ideal solution for both new installations and modernization of existing electrical systems in residential, commercial and industrial buildings. Its solid construction and high quality workmanship guarantee long-term and trouble-free operation, providing peace of mind to users and professionals responsible for the safety of electrical installations.