Why Choose the ABB S203M-B20NA Miniature Circuit Breaker?
The ABB S203M-B20NA is a high quality miniature circuit breaker (MCB) designed to provide reliable overload and short-circuit protection in residential, commercial and industrial electrical installations. As part of the professional ABB System pro M compact S200M series, it delivers dependable circuit protection for distribution boards, switchboards and control panels.
This miniature circuit breaker features a B curve tripping characteristic, making it suitable for standard electrical circuits with low inrush currents. It is commonly used for lighting circuits, socket outlet circuits and general power distribution where fast fault disconnection and reliable circuit protection are required.
With a rated current of 20 A, a 3+NP pole configuration and a breaking capacity of up to 10 kA, the S203M-B20NA is ideal for three-phase electrical systems requiring a switched neutral. Its compact DIN rail mounting design enables quick installation in modern modular electrical enclosures.
Key Advantages
- Reliable ABB miniature circuit breaker for electrical circuit protection.
- 20 A rated current for general-purpose three-phase circuits.
- B curve tripping characteristic for low inrush current applications.
- 3+NP configuration for three-phase systems with neutral switching.
- Current-limiting design helps protect cables and connected equipment.
- DIN rail mounting for fast installation in distribution boards and panels.
Key Features
- ABB System pro M compact S200M series.
- 20 A rated current.
- B curve tripping characteristic.
- 3+NP pole configuration.
- 10 kA rated breaking capacity at 230 / 400 V AC.
- Thermal tripping mechanism for overload protection.
- Electromechanical tripping mechanism for short-circuit protection.
- Compact modular design for DIN rail mounting.
Reliable Protection for Three-Phase Electrical Circuits
Miniature circuit breakers such as the ABB S203M-B20NA automatically disconnect electrical circuits during overload or short-circuit conditions. This helps protect cables, equipment and connected loads while supporting safe and compliant electrical installation design.
The ABB S200M range is engineered for professional installations requiring compact dimensions, dependable performance and high breaking capacity. Its modular format makes it suitable for use in electrical distribution boards, industrial panels and building services applications.
Typical Applications
- Commercial distribution boards.
- Residential and building services installations.
- Lighting and socket outlet circuits.
- Three-phase power distribution systems.
- Industrial control panels.
- OEM electrical panels and switchboards.
