ABB S203P-B40NA miniature circuit breaker from the S200P System pro M compact range, 3+NP configuration, B curve, 40 A rated current, designed for overload and short-circuit protection in electrical distribution systems.
The ABB S203P-B40NA is a high-performance miniature circuit breaker (MCB) from the ABB System pro M compact S200P series, designed to protect electrical circuits against overloads and short circuits. With its B-curve tripping characteristic and 40 A rated current, it is suitable for circuits with lower inrush currents where fast fault protection is required.
This ABB MCB features a 3+NP pole configuration, providing three protected poles with a neutral pole arrangement for three-phase plus neutral distribution systems. The S200P range is current limiting and built for dependable performance in residential, commercial and industrial electrical installations.
With compact DIN rail mounting, robust construction and a high breaking capacity design, the S203P-B40NA is ideal for professional distribution boards and control panels. It is also recognised under the manufacturer part number 2CDS283103R0405.
Miniature circuit breakers such as the ABB S203P-B40NA help protect electrical circuits by automatically disconnecting the supply during overload or short-circuit conditions. The delayed thermal tripping mechanism responds to overloads, while the electromechanical tripping mechanism reacts rapidly to short-circuit faults.
The B-curve characteristic makes this MCB suitable for circuits with relatively low starting currents, including resistive loads, general distribution circuits and lighting circuits with limited inrush demand. Its S200P construction provides reliable protection for demanding electrical installations.
| Current | 40 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200P System pro M Compact |
| Model | S203P-B40NA |
| Manufacturer part number | 2CDS283103R0405 |
| Product type | Miniature circuit breaker |
| Rated current | 40 A |
| Tripping characteristic | B curve |
| Number of poles | 3+NP |
| Number of protected poles | 3 |
| Breaking capacity | up to 25 kA at 230 / 400 V AC |
| Rated voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, CSA 22.2 No. 235 |
| Mounting type | DIN rail mounting |
| Protection rating | IP20 |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.56 kg |
| EAN | 4016779590143 |
The ABB S203P-B40NA is used to protect three-phase plus neutral electrical circuits against overloads and short circuits.
The S203P-B40NA has a rated current of 40 A.
A B-curve MCB trips more quickly under lower fault current conditions, making it suitable for resistive loads, general distribution and circuits with low inrush current.
The S203P-B40NA has a 3+NP pole configuration, providing three protected poles plus a neutral pole arrangement.
This MCB is typically installed on a DIN rail inside electrical distribution boards, control panels, consumer units and industrial enclosures.
ABB S200P miniature circuit breakers are widely used by electricians, panel builders and industrial engineers for dependable circuit protection, robust construction and professional electrical distribution performance.
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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...