ABB S203M-D40NA miniature circuit breaker from the System pro M compact S200M range featuring a 40 A rating, D curve characteristic, 3+NP configuration and 10 kA breaking capacity for industrial circuit protection.
£373.48
The ABB S203M-D40NA is a high performance miniature circuit breaker (MCB) designed to provide dependable overload and short-circuit protection in commercial, industrial and demanding electrical installations. As part of the professional ABB System pro M compact S200M series, it delivers reliable current-limiting protection for distribution boards, switchboards and industrial control panels.
Featuring a D curve tripping characteristic, this miniature circuit breaker is designed for circuits with high inrush currents, making it ideal for motors, transformers, compressors and other inductive loads. Its advanced thermal and magnetic trip mechanisms provide dependable protection against overloads and fault currents while helping to reduce equipment damage.
With a rated current of 40 A, a 3+NP pole configuration and a rated breaking capacity of 10 kA, the S203M-D40NA is suitable for demanding three-phase electrical systems where a switched neutral is required. Its compact DIN rail mounting design allows quick installation inside modern electrical distribution boards and control cabinets.
Miniature circuit breakers such as the ABB S203M-D40NA automatically disconnect electrical circuits during overload and short-circuit conditions, helping protect cables, switchgear and connected equipment while improving electrical safety.
The ABB S200M range combines compact dimensions with high breaking capacity and dependable performance. Its D curve characteristic makes this model particularly suitable for industrial machinery and equipment with high starting currents.
| Current | 40 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200M |
| Model | S203M-D40NA |
| Product type | Miniature circuit breaker |
| Product ID | 2CDS273103R0401 |
| EAN | 4016779663458 |
| Rated current | 40 A |
| Tripping characteristic | D curve |
| Pole configuration | 3+NP |
| Rated operational voltage | 230 / 400 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Rated breaking capacity | 10 kA |
| Current limiting class | 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail mounting |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.50 kg |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
The ABB S203M-D40NA protects three-phase electrical circuits against overloads and short circuits, particularly where high inrush current equipment is installed.
This miniature circuit breaker has a rated current of 40 A.
A D curve MCB is designed for circuits with high inrush currents, making it ideal for motors, transformers and other inductive loads.
The S203M-D40NA provides three protected phase poles together with a switched neutral pole for three-phase electrical systems.
It is designed for DIN rail installation inside electrical distribution boards, switchboards and industrial control panels.
ABB System pro M compact miniature circuit breakers are trusted by electricians, panel builders and industrial engineers for dependable circuit protection, robust construction and long-term reliability.
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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...