ABB S303P-K40 three-pole miniature circuit breaker with a 40 A rated current, Type K tripping characteristic and 25 kA breaking capacity for industrial motor and circuit protection.
£203.91
The ABB S303P-K40 (2CDS383001R0557) is a premium three-pole miniature circuit breaker (MCB) designed to provide dependable protection against overloads and short circuits in demanding industrial electrical installations. Part of the trusted ABB S300P series, it combines robust construction, high fault-breaking performance and reliable operation for industrial power distribution and motor protection.
Manufactured in accordance with IEC/EN 60947-2, UL 1077 and CSA standards, the S303P-K40 is designed for industrial control panels, switchgear assemblies and OEM equipment. Its compact DIN rail format, fail-safe screw terminals and flexible top or bottom supply connection allow fast installation and dependable long-term performance.
With a rated current of 40 A, a Type K tripping characteristic and a rated ultimate short-circuit breaking capacity of 25 kA at 415 V AC, the S303P-K40 is particularly suited to protecting motors, transformers, solenoids and other inductive loads with high inrush currents.
The ABB S303P-K40 automatically disconnects electrical circuits during overload or short-circuit conditions, protecting motors, transformers, cables and connected equipment from damage while helping minimise downtime and maintenance costs.
Its Type K tripping characteristic is optimised for inductive loads with elevated starting currents, making it ideal for industrial machinery, automation systems and OEM equipment where dependable motor protection is essential.
| Current | 40 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S300P |
| Model | S303P-K40 |
| Product ID | 2CDS383001R0557 |
| EAN | 4016779077620 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 40 A |
| Number of poles | 3 |
| Number of protected poles | 3 |
| Tripping characteristic | Type K |
| Rated AC voltage | 415 V AC |
| Maximum AC voltage | 480Y / 277 V AC |
| Maximum DC voltage | 125 V DC |
| Rated insulation voltage | 500 V |
| Rated impulse withstand voltage | 6 kV |
| Rated ultimate short-circuit breaking capacity | 25 kA at 415 V AC |
| Rated service breaking capacity | 20 kA at 240 V AC |
| Frequency | 50 / 60 Hz |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Dimensions (H × W × D) | 88 × 52.5 × 69 mm |
| Weight | Approx. 0.372 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The S303P-K40 protects industrial three-phase circuits against overloads and short circuits, particularly circuits supplying motors, transformers and other inductive equipment.
The ABB S303P-K40 has a rated current of 40 A.
Type K circuit breakers are designed for motors and inductive loads that generate high inrush currents during start-up.
The breaker provides a rated ultimate short-circuit breaking capacity of 25 kA at 415 V AC.
The breaker mounts directly onto a standard DIN rail inside switchboards, industrial control panels and electrical distribution systems.
ABB S300P miniature circuit breakers are trusted by electrical engineers, panel builders and OEM manufacturers for dependable protection, high breaking performance and long-term reliability in demanding industrial environments.
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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...