Why Choose the ABB 2CDS381103R0577 S301P-K50NA Miniature Circuit Breaker?
The ABB 2CDS381103R0577, also designated S301P-K50NA, is a high-performance miniature circuit breaker (MCB) from the ABB System pro M Compact S300P series. Designed for industrial and infrastructure applications, it protects electrical circuits against overloads and short circuits while providing the high interruption capability required in demanding installations.
This ABB S300P circuit breaker features fail-safe bi-directional terminals, integrated contact and trip-position indication, and a dual-release DIN rail mounting system. Supply can be connected from the top or bottom, helping panel builders and electrical contractors achieve flexible, secure and efficient installation.
With a 50 A rated current, a Type K tripping characteristic, a 1P+N pole configuration and a 25 kA ultimate short-circuit breaking capacity, the ABB 2CDS381103R0577 is particularly suitable for motors, transformers, contactors, solenoids and other inductive loads that produce high starting currents.
Key Advantages
- Dependable overload and short-circuit protection for industrial electrical installations.
- 50 A rated current for higher-capacity machinery and distribution circuits.
- Type K tripping characteristic accommodates elevated motor and transformer starting currents.
- 1P+N configuration protects the phase conductor and simultaneously switches the neutral.
- 25 kA ultimate breaking capacity supports installations with high prospective fault currents.
- Integrated trip indicator makes fault identification quicker and easier.
- Fail-safe terminals help prevent incorrect conductor insertion.
- Top or bottom supply connection provides greater panel-wiring flexibility.
- Compatible with the ABB System pro M Compact accessory range.
Key Features
- ABB System pro M Compact S300P series.
- S301P-K50NA extended product type.
- 50 A rated current.
- Type K magnetic tripping range of approximately 10–14 × rated current.
- One protected pole plus switched neutral (1P+N).
- 240 V AC and 72 V DC rated operating voltage.
- 25 kA ultimate short-circuit breaking capacity.
- Real contact-position and mechanical trip-position indication.
- Dual-release mounting for standard 35 mm DIN rail.
- Fail-safe bi-directional cylinder-lift screw terminals.
Type K Circuit Protection for High-Inrush Loads
Type K miniature circuit breakers are engineered for circuits containing inductive equipment that draws a substantial current when energised. The ABB S301P-K50NA has an electromagnetic tripping range of approximately ten to fourteen times its rated current, allowing normal motor or transformer start-up currents to pass without unnecessary interruption.
If a sustained overload or genuine short circuit occurs, the breaker disconnects the affected circuit to protect cables, equipment and the wider installation. This balance between inrush-current tolerance and rapid fault response makes the ABB 2CDS381103R0577 well suited to industrial machinery, automation systems and other applications where conventional protection may experience nuisance tripping.
Typical Applications
- Industrial motor circuits.
- Transformers and control transformers.
- Contactors, solenoids and electromagnetic equipment.
- Industrial automation and process-control systems.
- Machine building and OEM equipment.
- Industrial control panels.
- Commercial and industrial distribution boards.
- Infrastructure and transportation installations.
- Circuits with elevated switch-on or starting currents.
