Why Choose the ABB 2CDS383103R0217 S303P-K1NA Miniature Circuit Breaker?
The ABB 2CDS383103R0217, also known as the S303P-K1NA, is a high-performance miniature circuit breaker (MCB) developed to protect industrial electrical installations against overloads and short circuits. Part of the proven ABB S300P System pro M compact range, it combines a high breaking capacity with compact DIN rail dimensions and dependable long-term operation.
Featuring a 3P+N configuration, the S303P-K1NA protects all three phase conductors and incorporates a switched neutral pole. Its Type K tripping characteristic is designed for circuits with elevated starting currents, making the breaker particularly suitable for motors, transformers, solenoids, contactors and other inductive equipment.
With a rated current of 1 A, a rated operating voltage of up to 415 V AC and a 25 kA short-circuit breaking capacity, the ABB S303P-K1NA offers robust circuit protection for industrial control panels, switchboards, machinery and automation systems. Supply can be connected from the top or bottom, helping simplify panel design and installation.
Key Advantages
- High-performance ABB miniature circuit breaker for industrial applications.
- 1 A rated current with Type K tripping characteristic.
- 3P+N configuration with three protected poles and switched neutral.
- 25 kA short-circuit breaking capacity.
- Suitable for circuits with high motor or transformer starting currents.
- Compact DIN rail design for efficient panel installation.
Key Features
- ABB S300P System pro M compact series.
- 1 A rated operational current.
- Type K instantaneous tripping characteristic.
- Three protected phase poles plus switched neutral.
- 25 kA rated short-circuit breaking capacity.
- Thermal overload and electromagnetic short-circuit protection.
- Top or bottom supply connection.
- Fail-safe terminals help reduce incorrect conductor insertion.
- DIN rail mounting for industrial control and distribution panels.
Reliable Protection for Inductive Industrial Loads
The ABB S303P-K1NA uses a delayed thermal mechanism to protect against sustained overload conditions and an electromagnetic mechanism to disconnect the circuit rapidly during a short circuit. This dual protection helps safeguard cables, machinery and connected equipment while reducing the risk of electrical damage and unplanned downtime.
Its Type K characteristic permits higher short-duration starting currents than Type B or Type C breakers, reducing nuisance tripping when inductive equipment is energised. This makes the S303P-K1NA a suitable choice for specialised low-current motor, transformer and control circuits.
Typical Applications
- Industrial motor control circuits.
- Transformer protection circuits.
- Solenoid and contactor circuits.
- Industrial automation systems.
- Machine control panels.
- OEM machinery and production equipment.
