ABB S203M-K40 three-pole 40 A miniature circuit breaker with K tripping characteristic and 10 kA breaking capacity for industrial, commercial and panel building applications.
£151.86
The ABB S203M-K40 is a robust three-pole miniature circuit breaker (MCB) designed to provide reliable overload and short-circuit protection in industrial, commercial and panel building applications. As part of the ABB S200M System pro M compact series, it combines compact DIN rail installation with dependable protection for demanding electrical systems.
This circuit breaker features a K tripping characteristic, making it particularly suitable for circuits with higher inrush currents such as motors, transformers, solenoids and other inductive loads. Its current limiting design helps reduce fault energy, protecting connected cables, switchgear and equipment during abnormal operating conditions.
With a 40 A rated current, three-pole configuration and 10 kA short-circuit breaking capacity, the ABB S203M-K40 is well suited to three-phase distribution boards, machinery panels and automation systems where reliable protection and reduced nuisance tripping are essential.
Miniature circuit breakers such as the ABB S203M-K40 automatically disconnect the electrical supply when overload or short-circuit conditions occur. This helps protect wiring, switchgear and connected equipment from damage caused by excessive current.
The K curve is especially useful in applications where inductive loads may draw higher starting currents during normal operation. This helps minimise unwanted tripping while maintaining dependable protection during genuine electrical faults.
| Current | 40 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | S200M |
| Model | S203M-K40 |
| Product ID | 2CDS273001R0557 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 40 A |
| Number of poles | 3P |
| Tripping characteristic | K |
| Rated operational voltage | 230 / 400 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Rated frequency | 50 / 60 Hz |
| Rated short-circuit breaking capacity | 10 kA |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077 |
| Mounting type | DIN rail |
| Protection rating | IP20 |
| Dimensions (H × W × D) | 88 × 52.5 × 69 mm |
| Weight | approx. 0.375 kg |
| EAN | 4016779601337 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203M-K40 is used to protect three-phase electrical circuits against overloads and short circuits in industrial, commercial and panel building applications.
The K characteristic is designed for circuits with higher inrush currents, making it suitable for inductive loads such as motors, transformers and control equipment.
The ABB S203M-K40 has a 40 A rated current.
This model is a three-pole (3P) miniature circuit breaker for three-phase electrical systems.
The ABB S203M-K40 provides a 10 kA short-circuit breaking capacity at 230 / 400 V AC.
ABB S200M miniature circuit breakers are trusted by contractors, panel builders and industrial engineers for reliable protection, compact installation and consistent performance in demanding electrical systems.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...