Why Choose the ABB 2CDS383103R0517 S303P-K25NA Miniature Circuit Breaker?
The ABB 2CDS383103R0517, also identified as the S303P-K25NA, is a high-performance miniature circuit breaker (MCB) designed to protect industrial electrical circuits against overloads and short circuits. As part of the advanced ABB System pro M compact S300P series, it combines a high breaking capacity with dependable switching performance for demanding power distribution and control-panel applications.
This circuit breaker features a K tripping characteristic, making it particularly suitable for circuits containing equipment with elevated starting currents, including motors, transformers and inductive loads. Its thermal release provides overload protection, while the electromagnetic release enables rapid interruption during short-circuit conditions.
With a rated current of 25 A, a 3P+N configuration and a rated operational voltage of up to 415 V AC, the S303P-K25NA is well suited to three-phase industrial distribution systems. Its 25 kA breaking capacity, DIN-rail mounting and integrated trip indication support safe, efficient installation in machinery, switchboards and automation control panels.
Key Advantages
- High-performance miniature circuit breaker for industrial circuit protection.
- 25 A rated current for three-phase electrical loads.
- 3P+N pole configuration for switching three phases and neutral.
- Type K tripping characteristic suitable for loads with high starting currents.
- 25 kA short-circuit breaking capacity for demanding installations.
- Integrated trip indicator provides clear visual identification of tripping events.
- Fail-safe terminals help reduce the risk of incorrect conductor installation.
- Compatible with ABB System pro M compact accessories.
Key Features
- ABB System pro M compact S300P series.
- S303P-K25NA extended product type.
- 25 A rated current.
- 415 V AC rated operational voltage.
- 3P+N pole arrangement.
- K characteristic with magnetic tripping suited to inductive loads.
- 25 kA rated ultimate short-circuit breaking capacity.
- Integrated contact-position and trip-position indication.
- Bi-directional terminals allow supply from the top or bottom.
- Dual-release mounting system for fast installation on a 35 mm DIN rail.
Reliable Circuit Protection for Industrial Installations
Miniature circuit breakers such as the ABB S303P-K25NA automatically disconnect an electrical circuit when excessive current is caused by an overload or short circuit. This helps protect cables, machinery and electrical equipment from damage while reducing the risk of unsafe operating conditions.
The Type K operating characteristic is designed for equipment that may draw a substantial inrush current during start-up. This makes the breaker a practical choice for industrial motors, transformers, solenoids and similar inductive loads where a more sensitive tripping curve could cause unwanted interruptions.
Typical Applications
- Industrial motors and motor control circuits.
- Transformers and inductive electrical loads.
- Machinery and factory automation panels.
- Three-phase power distribution boards.
- Renewable energy and transportation systems.
- Food and beverage production equipment.
- Commercial and industrial switchboards.
