Why Choose the ABB S303P-K20 Miniature Circuit Breaker?
The ABB S303P-K20 (2CDS383001R0487) is a high-performance three-pole miniature circuit breaker (MCB) designed to protect industrial electrical installations against overloads and short circuits. Part of the dependable ABB S300P series, it combines robust construction, high breaking capacity and reliable switching performance for demanding three-phase applications.
Manufactured in accordance with recognised IEC and UL standards, the S303P-K20 is suitable for installation in industrial control panels, switchgear assemblies and power distribution systems. Its compact modular design supports efficient DIN rail installation, while fail-safe terminals help prevent incorrect conductor insertion.
With a rated current of 20 A, a Type K tripping characteristic and a rated short-circuit breaking capacity of 25 kA, this circuit breaker is particularly well suited to motors, transformers, solenoids and other inductive loads with elevated starting currents.
Key Advantages
- Reliable overload and short-circuit protection.
- 20 A rated current for industrial three-phase circuits.
- Type K tripping characteristic for loads with high inrush currents.
- 25 kA breaking capacity for demanding installations.
- Three protected poles provide coordinated circuit protection.
- Compact DIN rail design simplifies panel installation.
Key Features
- ABB S300P series.
- Three-pole configuration.
- 20 A rated current.
- Type K tripping characteristic.
- Rated operating voltage up to 415 V AC.
- Rated operating voltage up to 125 V DC.
- 25 kA rated short-circuit breaking capacity.
- Fail-safe terminals help prevent incorrect conductor installation.
- Supply connection possible from the top or bottom.
- Compatible with ABB System pro M Compact accessories.
Reliable Protection for Motors and Inductive Loads
The ABB S303P-K20 automatically disconnects the electrical supply when excessive current is caused by an overload or short circuit. This helps protect cables, motors and connected equipment while reducing the risk of electrical damage, production interruptions and unplanned downtime.
Its Type K characteristic accommodates the elevated inrush currents commonly produced when motors, transformers and other inductive devices start. This helps minimise nuisance tripping while maintaining dependable protection during genuine fault conditions.
Typical Applications
- Three-phase motor circuits.
- Transformers and inductive loads.
- Industrial control panels.
- Machine building and OEM equipment.
- Manufacturing and automation systems.
- Industrial power distribution boards.
