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2CDS383001R0557 ABB S303P-K40 Miniature Circuit Breaker – 3P – K – 40 A
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.
This product has been discontinued
A direct replacement is available below.
Replacement product
ABB S303P-K40 Miniature Circuit Breaker - 3P - K - 40 A
SKU: 2CDS383001R0557
£112.15 ex VAT
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£112.15
Why Choose the ABB S303P-K40 Miniature Circuit Breaker?
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.
Key Advantages
- Industrial-grade three-pole miniature circuit breaker.
- 40 A rated current for demanding three-phase installations.
- Type K tripping characteristic for motors and inductive loads.
- 25 kA breaking capacity for industrial fault protection.
- Fail-safe screw terminals provide secure conductor connection.
- Compact DIN rail mounting simplifies installation.
Key Features
- ABB S300P series.
- Three-pole configuration.
- 40 A rated current.
- Type K tripping characteristic.
- Rated operating voltage up to 415 V AC.
- Maximum operating voltage up to 125 V DC.
- 25 kA rated ultimate short-circuit breaking capacity at 415 V AC.
- Fail-safe screw terminals.
- Top or bottom supply connection.
- Compatible with ABB System pro M Compact accessories.
Reliable Protection for Industrial Motors and Equipment
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.
Typical Applications
- Three-phase motor protection.
- Industrial control panels.
- Machine building and OEM equipment.
- Transformers and inductive loads.
- Industrial power distribution.
- Manufacturing and automation systems.
Technical Specifications
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| Certification | UL 1077 | |
|---|---|---|
| Current | 40 A | |
| Phase | Three Phase | |
| Poles | 3-pole | |
| Device Type | MCB | |
| Trip Curve | K curve | |
| Breaking Capacity | 25 kA | |
| 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 |
Frequently Asked Questions
What is the ABB S303P-K40 used for?
The S303P-K40 protects industrial three-phase circuits against overloads and short circuits, particularly circuits supplying motors, transformers and other inductive equipment.
What is the rated current of this circuit breaker?
The ABB S303P-K40 has a rated current of 40 A.
What does the Type K tripping characteristic provide?
Type K circuit breakers are designed for motors and inductive loads that generate high inrush currents during start-up.
What is the breaking capacity of the S303P-K40?
The breaker provides a rated ultimate short-circuit breaking capacity of 25 kA at 415 V AC.
How is the ABB S303P-K40 installed?
The breaker mounts directly onto a standard DIN rail inside switchboards, industrial control panels and electrical distribution systems.
Trusted by Industrial Professionals Worldwide
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.
