Why Choose the ABB S203M-B40 Miniature Circuit Breaker?
The ABB S203M-B40 is a compact and reliable 3-pole miniature circuit breaker (MCB) designed to protect electrical circuits against overloads and short circuits. As part of the ABB System pro M compact S200M series, it provides dependable low voltage circuit protection for commercial, industrial and residential electrical installations.
Featuring a B curve tripping characteristic, the S203M-B40 is suitable for general purpose circuits where relatively low inrush currents are expected. Its current limiting design combines delayed thermal tripping for overload protection with electromechanical tripping for short circuit protection, helping maintain safe and consistent circuit operation.
With a 40 A rated current, 3-pole configuration and 10 kA breaking capacity, this miniature circuit breaker is ideal for DIN rail mounted distribution boards, control panels and electrical enclosures where robust, compact and high quality circuit protection is required.
Key Advantages
- Compact 3-pole miniature circuit breaker for reliable circuit protection.
- 40 A current rating for low voltage electrical circuits.
- B curve tripping characteristic for general purpose applications.
- 10 kA short circuit breaking capacity at 230 / 400 V AC.
- Thermal overload and electromechanical short circuit protection.
- DIN rail mounting for fast installation in distribution boards and control panels.
Key Features
- ABB System pro M compact S200M series.
- 3-pole (3P) miniature circuit breaker.
- 40 A rated current.
- B curve tripping characteristic.
- 10 kA rated breaking capacity.
- Current limiting design for enhanced circuit protection.
- Complies with IEC/EN 60898-1 and IEC/EN 60947-2.
- Compatible with selected ABB System pro M compact accessories.
Reliable Protection for Electrical Distribution Systems
Miniature circuit breakers such as the ABB S203M-B40 automatically disconnect the supply when overload or short circuit faults are detected. This helps protect cables, connected equipment and downstream circuits from damage while supporting safer operation in low voltage installations.
The ABB S200M range is widely used by electrical contractors, panel builders and industrial engineers because it combines compact DIN rail mounting, high breaking performance and dependable switching for demanding electrical environments.
Typical Applications
- Commercial electrical distribution boards.
- Industrial control panels.
- Residential three-phase installations.
- Machine building and automation systems.
- Lighting and power distribution circuits.
- OEM electrical equipment and enclosures.
