SZ203-B50 overcurrent circuit breaker, 3P, B characteristic, 50A, 6kA, AC 2CDS253025R0505

Reliable protection of electrical installations – ABB SZ203-B50 circuit breaker

This three-pole circuit breaker with B characteristic is a key element of every safe and reliable electrical installation. Designed for both domestic and commercial applications, it provides effective protection against overloads and short circuits. The SZ203-B50 model, with a rated current of 50A and a short-circuit breaking capacity of 6kA, guarantees safety for devices and installations.

Construction and mounting

The circuit breaker is designed for mounting on a DIN rail, which simplifies and speeds up installation. Its compact dimensions – 3 modules wide – allow for efficient use of space in the distribution board. The solid construction ensures durability and reliable operation for a long time. The cross-section of the connectable single-wire conductor up to 35 mm² and multi-wire conductor up to 25 mm² provides flexibility in cable selection.

Characteristics and application

The B characteristic means that the circuit breaker reacts quickly to an increase in short-circuit current, but tolerates short-term current surges during the start-up of devices with high power consumption, such as motors or transformers. This minimizes the risk of unnecessary tripping of the installation. The rated voltage of 400V and the insulation voltage Ui of 440V make it a universal solution for most standard electrical installations. The short-circuit capacity Icn at 6kA at 230V and 400V provides effective protection in the event of a short circuit. The degree of protection IP20 protects against finger contact and the ingress of solid objects larger than 12.5 mm.

Key product features

• Overload and short-circuit protection: Protects the circuit from damage caused by excessive load or short circuit.
• B characteristic: Ideal for protecting circuits with devices with high inrush current (e.g. motors).
• High short-circuit breaking capacity (6kA): Ensures quick and safe disconnection of the power supply in the event of a short circuit.
• DIN rail mounting: Simplifies and speeds up installation.
• Compact dimensions (3 modules): Allow for efficient use of space in the distribution board.
• Wide operating temperature range (-25…55°C): Enables use in various environmental conditions.
• Complies with EN 60898-1 standard: Guarantee of safety and quality confirmed by a certificate of conformity with European standards.
• Expandability: Compatible with additional accessories increasing the functionality of the pro M compact ABB system.