ABB S203-D20 three-pole miniature circuit breaker with a 20 A current rating, D-curve tripping characteristic and 6 kA short-circuit breaking capacity for industrial and commercial circuit protection.
£80.96
The ABB S203-D20 is a reliable three-pole miniature circuit breaker (MCB) designed to protect electrical circuits and connected equipment against overloads and short circuits. As part of the proven ABB System pro M compact S200 series, it provides dependable protection for commercial, industrial and building-services electrical installations.
The circuit breaker combines a delayed thermal tripping mechanism for overload protection with an electromechanical tripping mechanism for rapid short-circuit protection. Its D-curve tripping characteristic is particularly suitable for circuits supplying equipment with high starting or inrush currents, including motors, transformers, solenoids and industrial machinery.
With a rated current of 20 A, a three-pole configuration and a rated short-circuit capacity of 6 kA at 400 V AC, the S203-D20 is ideal for protecting three-phase electrical loads. Its compact modular design enables straightforward installation on a standard 35 mm DIN rail inside distribution boards, switchboards and industrial control panels.
Miniature circuit breakers such as the ABB S203-D20 automatically disconnect the electrical supply when an overload or short circuit is detected. The thermal tripping mechanism responds to sustained excess current, while the electromechanical mechanism provides rapid disconnection during severe short-circuit conditions.
The D-curve characteristic allows the circuit breaker to tolerate higher momentary current peaks than standard B-curve or C-curve devices. This makes the S203-D20 suitable for motors, transformers and other inductive loads that can draw a substantial current during start-up without compromising reliable circuit protection.
| Current | 20 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200 |
| Model | S203-D20 |
| Product ID | 2CDS253001R0201 |
| EAN | 4016779530934 |
| Product type | Miniature circuit breaker |
| Number of poles | 3 |
| Number of protected poles | 3 |
| Rated current | 20 A |
| Tripping characteristic | D curve |
| Rated operational voltage | up to 440 V AC according to IEC/EN 60947-2 |
| Rated frequency | 50 / 60 Hz |
| Rated short-circuit capacity | 6 kA at 400 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Energy-limiting class | 3 |
| Protection rating | IP20 |
| Protection in enclosure | IP40 with suitable cover |
| Terminal type | Screw terminals |
| Mounting type | 35 mm DIN rail |
| Operating temperature | -25 to +55 °C |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 and UL 1077 |
| Dimensions (H × W × D) | approximately 88 × 52.5 × 69 mm |
| Weight | approximately 0.38 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203-D20 protects three-phase electrical circuits against overloads and short circuits, particularly where connected equipment produces a high starting or inrush current.
The miniature circuit breaker has a rated current of 20 A.
A D-curve circuit breaker permits relatively high short-duration starting currents before magnetic tripping occurs, making it suitable for motors, transformers and other inductive loads.
The S203-D20 has a rated short-circuit capacity of 6 kA at 400 V AC according to IEC/EN 60898-1.
The circuit breaker is designed for installation on a standard 35 mm DIN rail inside an electrical distribution board, switchboard or industrial control panel.
ABB System pro M compact S200 miniature circuit breakers are widely used by electrical contractors, panel builders and automation engineers for dependable overload and short-circuit protection in modern electrical installations.
● 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...