ABB S203M-B40NA miniature circuit breaker from the System pro M compact S200M series, rated at 40 A with B curve tripping characteristic and 3P+N configuration for low-voltage circuit protection.
£176.12
The ABB S203M-B40NA is a high-performance miniature circuit breaker (MCB) designed to protect electrical circuits against overloads and short circuits. As part of the trusted ABB System pro M compact S200M series, this device provides dependable circuit protection for residential, commercial and industrial low-voltage installations.
This 40 amp B-curve circuit breaker combines thermal overload protection with electromechanical short-circuit tripping, helping to safeguard cables, equipment and distribution circuits. Its compact DIN rail format and patented terminal design support safe, efficient installation within modern electrical panels.
With a rated current of 40 A and a 3P+N configuration, the S203M-B40NA is suitable for three-phase circuits requiring neutral switching. The B tripping characteristic makes it ideal for circuits with low inrush currents, including lighting, control circuits and general distribution applications.
Miniature circuit breakers such as the ABB S203M-B40NA are used to protect electrical installations by automatically disconnecting a circuit when excessive current is detected. This helps prevent cable damage, equipment failure and electrical hazards caused by overloads or short circuits.
The S200M series is designed for dependable performance in demanding environments. Its current-limiting design, compact footprint and recognised approvals make it a practical choice for panel builders, electrical contractors and industrial maintenance teams.
| Current | 40 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200M |
| Model | S203M-B40NA |
| Product type | Miniature circuit breaker |
| Manufacturer part number | 2CDS273103R0405 |
| Rated current | 40 A |
| Tripping characteristic | B curve |
| Number of poles | 3P+N |
| Rated operational voltage | up to 440 V AC |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077 |
| Degree of protection | IP20 |
| Mounting type | DIN rail |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.5 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203M-B40NA is used to protect low-voltage electrical circuits against overloads and short circuits in distribution boards and control panels.
This miniature circuit breaker has a rated current of 40 A.
The B curve tripping characteristic is suitable for circuits with low inrush currents, such as lighting, control and general distribution circuits.
The S203M-B40NA has a 3P+N configuration, making it suitable for three-phase circuits with neutral switching.
It is typically installed on DIN rail inside electrical distribution boards, control panels and industrial enclosures.
ABB System pro M compact miniature circuit breakers are widely used by panel builders, electrical contractors and industrial engineers for reliable circuit protection in modern low-voltage installations.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...