Overcurrent circuit breaker, 3P, K characteristic, 25A, 25kA, AC | S303P-K25 2CDS383001R0517

3P Overcurrent Circuit Breaker – reliable installation protection

This three-pole overcurrent circuit breaker from ABB's S303P series, with K characteristic and a rated current of 25A, is a key element of every safe and efficient electrical installation. It provides effective protection of circuits against overloads and short circuits, minimizing the risk of damage to equipment and fires. The K characteristic means that the circuit breaker reacts with a slight delay to short-term current surges, which is particularly important for devices with electric motors or other elements generating high inrush currents.

Construction and practical application

The S303P-K25 circuit breaker is designed to operate in AC/DC installations with a rated voltage of 415V. Its compact dimensions – 3 modules wide (69 mm installation depth) – allow for easy mounting in electrical distribution boards. The rated short-circuit breaking capacity of 25kA at 400V guarantees its reliable operation even in difficult operating conditions. The possibility of connecting wires with a cross-section from 0.75 mm² to 25 mm² (multi-strand) or 0.75 mm² to 35 mm² (solid) provides flexibility when selecting appropriate cables. It is intended for protecting circuits with high power demand, where protection against impulse-type overloads is important.

Key features and benefits

• High short-circuit breaking capacity: 25kA at 415V ensures effective protection of the installation in the event of a short circuit.

• K characteristic: Ideal for protecting circuits with devices generating high inrush currents, such as motors or transformers. This avoids unnecessary tripping of the circuit breaker during normal operation of these devices.

• Wide voltage range: Operation in both AC and DC circuits increases versatility.

• Compact dimensions: 3 modules wide makes it easy to install in tight electrical distribution boards.

• Expandability: Compatibility with additional equipment allows the circuit breaker to be adapted to specific installation needs.

• Safety: Compliance with IEC 60947-2 and EN 60898 standards ensures a high level of safety. Protection class IP20 protects against accidental contact.

• Durable construction: Made of high-quality materials guarantees long life and reliable operation for many years.

• Wire cross-section: The possibility of connecting wires with a cross-section from 0.75 mm² to 25 mm² (multi-strand) or from 0.75 mm² to 35 mm² (solid) provides great freedom when choosing appropriate power cables.