Why Choose the ABB 2CDS383103R0984 S303P-C0.5NA Miniature Circuit Breaker?
The ABB 2CDS383103R0984, also identified as the S303P-C0.5NA, is an industrial miniature circuit breaker (MCB) designed to protect electrical installations against overloads and short circuits. As part of the ABB System pro M compact S300P series, it combines precise low-current protection with a high short-circuit breaking capacity for demanding control, automation and auxiliary circuits.
Featuring a Type C tripping characteristic, the circuit breaker is suitable for loads that may produce moderate inrush currents during normal operation. Its thermal release provides dependable overload protection, while its magnetic release rapidly disconnects the circuit when a short-circuit fault occurs.
With a rated current of 0.5 A, a 3P+N configuration and an operational voltage of up to 415 V AC, the S303P-C0.5NA is ideal for low-current three-phase control circuits requiring a switched neutral. Its 25 kA ultimate short-circuit breaking capacity, compact DIN-rail format and compatibility with ABB System pro M compact accessories support safe and efficient panel construction.
Key Advantages
- Reliable overload and short-circuit protection for industrial electrical circuits.
- 0.5 A rated current for sensitive control and auxiliary applications.
- 3P+N pole configuration for three-phase systems with a switched neutral.
- Type C tripping characteristic for loads with moderate inrush currents.
- 25 kA ultimate breaking capacity for installations with high prospective fault currents.
- Thermal and magnetic releases provide comprehensive circuit protection.
- Supply connection is possible from the top or bottom.
- Compatible with ABB System pro M compact accessories.
Key Features
- ABB System pro M compact S300P series.
- S303P-C0.5NA model.
- 0.5 A rated current.
- Up to 415 V AC operational voltage.
- 3P+N pole arrangement.
- Type C tripping characteristic.
- 25 kA ultimate short-circuit breaking capacity.
- Thermal overload and magnetic short-circuit releases.
- Fail-safe terminals help prevent incorrect conductor insertion.
- Standard 35 mm DIN-rail mounting.
High-Performance Protection for Sensitive Low-Current Circuits
The ABB S303P-C0.5NA is designed for circuits carrying very low operating currents that may still be exposed to significant prospective short-circuit levels. During an overload, its thermal release disconnects the circuit after a controlled delay. If a short circuit occurs, its magnetic release operates rapidly to limit fault energy and protect conductors and connected equipment.
Its Type C characteristic accommodates the moderate inrush currents associated with control transformers, relays, contactor coils and similar industrial devices. This helps reduce unnecessary tripping while maintaining dependable protection during genuine electrical faults.
Typical Applications
- Industrial control and automation panels.
- Instrumentation and monitoring circuits.
- Relay and contactor control circuits.
- Control transformers and auxiliary supplies.
- Low-current signalling systems.
- Three-phase control systems with neutral.
- OEM machinery and production equipment.
- Transportation and infrastructure control panels.
