Overcurrent circuit breaker, 3P, B characteristic, 63A, 6kA, AC | S203-B63 2CDS253001R0635

Three-pole circuit breaker S203-B63 – reliable installation protection

This three-pole circuit breaker with B characteristic, rated current of 63A and short-circuit breaking capacity of 6kA is a key element of every safe electrical installation. Designed by ABB, the S203-B63 model from the S200 series combines compact size with high effectiveness in protecting against overloads and short circuits. It is an ideal solution for both home installations and commercial and industrial facilities.

Construction and application

The S203-B63 circuit breaker is designed for mounting on a DIN rail and provides effective protection for electrical circuits. The B characteristic means that the circuit breaker reacts quickly to an increase in short-circuit current, but is more tolerant of short-term inrush currents, making it suitable for protecting circuits powering devices with high starting power consumption – such as motors or transformers. The short-circuit breaking capacity of 6kA guarantees safe disconnection of the circuit in the event of a serious failure.

Key features and benefits

• High reliability: ABB S200 series circuit breakers are known for their solid construction and long service life.
• Wide range of applications: They meet the requirements of EN 60898-1 and EN 60947-2 standards, allowing their use in various applications.
• Compact dimensions: A width of 3 modules allows for efficient use of space in the switchgear cabinet.
• Optimal protection: The B characteristic provides effective protection against overloads and short circuits, minimizing the risk of damage to the installation and equipment.
• Safety of use: Rated impulse withstand voltage of 4kV increases resistance to overvoltages.
• Installation flexibility: Designed for DIN rail mounting, it simplifies and speeds up installation.
• Wide operating temperature range: The ability to operate in a temperature range from -25°C to +55°C ensures reliability in various environmental conditions.

Technical parameters in practice

The S203-B63 circuit breaker is characterized by a rated current of 63A, which means it is able to safely handle circuits with significant power consumption. The rated short-circuit breaking capacity Icn is 6kA at 400V and 20kA at 230V – these values determine the maximum short-circuit current that the circuit breaker can safely interrupt without damage. The cross-section of the conductors connected to the circuit breaker can range from 0.75 mm² to 25 mm² (multi-strand) or from 0.75 mm² to 35 mm² (solid core), providing a great deal of freedom in selecting conductors tailored to specific installation needs. The IP20 degree of protection provides protection against finger contact, but does not protect against the effects of water or dust – therefore, the circuit breaker should be mounted in a protective housing.