Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
2CDA383799R0401 ABB M303P-D40 Magnetic Circuit Breaker 40 A 3P 25 kA
ABB M303P-D40 is a 40 A three-pole D-characteristic magnetic-only circuit breaker with 25 kA ultimate short-circuit breaking capacity at 415 V AC for industrial circuit protection.
£115.94
Why Choose the ABB M303P-D40 Magnetic Circuit Breaker?
The ABB M303P-D40 is a high-performance three-pole magnetic-only miniature circuit breaker designed to provide dependable short-circuit protection for industrial electrical installations. As part of the ABB M300P series, it combines a compact modular format with a high breaking capacity for demanding machinery, control and distribution applications.
With a rated current of 40 A and a D magnetic tripping characteristic, the M303P-D40 is intended for circuits where dedicated magnetic short-circuit protection is required. Its three protected poles enable simultaneous protection of three-phase circuits, while screw terminals provide secure electrical connections within industrial distribution boards and control panels.
The M303P-D40 provides an ultimate short-circuit breaking capacity (Icu) of 25 kA at 415 V AC, an impulse withstand voltage of 6 kV and a rated insulation voltage of 500 V. Manufactured in accordance with IEC/EN 60947-2, it is engineered for reliable industrial circuit protection over a wide operating temperature range.
Key Advantages
- Dedicated magnetic-only protection for industrial short-circuit protection applications.
- 40 A rated current for three-phase industrial circuits.
- Three-pole configuration with all three poles protected.
- High 25 kA ultimate breaking capacity at 415 V AC.
- D tripping characteristic for magnetic instantaneous protection.
- Compact modular construction simplifies installation in industrial control and distribution equipment.
Key Features
- ABB M300P magnetic-only circuit breaker series.
- 40 A rated current.
- 3-pole, 3 protected poles.
- D magnetic tripping characteristic.
- 25 kA Icu at 415 V AC.
- 10 kA Ics at 440 V AC.
- 500 V rated insulation voltage.
- 6 kV impulse withstand voltage.
- IP20 protection rating.
- Screw-terminal connections for secure installation.
Reliable Magnetic Short-Circuit Protection
Magnetic-only circuit breakers such as the ABB M303P-D40 respond rapidly to high fault currents, providing short-circuit protection without the conventional thermal overload element found in standard thermal-magnetic MCBs. This makes them particularly useful where overload protection is provided separately or where dedicated magnetic protection is required as part of a coordinated industrial protection system.
The M300P series is designed for industrial installations where high breaking capacity, compact dimensions and dependable operation are important. The M303P-D40 combines three-pole switching with robust electrical characteristics, making it suitable for integration into machinery panels, industrial distribution equipment and automation systems.
Typical Applications
- Industrial machinery and automation control panels.
- Three-phase electrical distribution circuits.
- Motor circuits with separate overload protection.
- Manufacturing and production equipment.
- Industrial control cabinets and switchboards.
- Circuits requiring dedicated magnetic short-circuit protection.
Technical Specifications
| Series | M300P |
|---|---|
| ABB order code | 2CDA383799R0401 |
| Product type | Magnetic-only miniature circuit breaker |
| Rated current | 40 A |
| Number of poles | 3 |
| Protected poles | 3 |
| Tripping characteristic | D |
| Ultimate short-circuit breaking capacity (Icu) | 25 kA at 415 V AC |
| Service short-circuit breaking capacity (Ics) | 10 kA at 440 V AC |
| Rated insulation voltage (Ui) | 500 V |
| Rated impulse withstand voltage (Uimp) | 6 kV |
| Rated frequency | 50 / 60 Hz |
| Protection rating | IP20 |
| Pollution degree | 3 |
| Operating temperature | -40 to +70 °C |
| Terminal type | Screw terminal |
| Tightening torque | 2.8 N·m |
| Standard | IEC/EN 60947-2 |
| Dimensions (H × W × D) | 88 × 52.5 × 69 mm |
| Weight | 0.372 kg |
Frequently Asked Questions
What is the ABB M303P-D40 used for?
The ABB M303P-D40 is a three-pole magnetic-only circuit breaker designed primarily to provide short-circuit protection in industrial electrical installations.
What is the rated current of the M303P-D40?
The M303P-D40 has a rated current of 40 A.
What is the breaking capacity of the ABB M303P-D40?
It has an ultimate short-circuit breaking capacity (Icu) of 25 kA at 415 V AC.
How many poles does the M303P-D40 have?
The M303P-D40 is a 3-pole circuit breaker, with all three poles protected.
Does the M303P-D40 provide thermal overload protection?
No. The M303P-D40 is a magnetic-only circuit breaker intended primarily for short-circuit protection, so suitable overload protection should be provided separately where the application requires it.
Trusted Industrial Circuit Protection from ABB
ABB M300P magnetic circuit breakers provide compact, high-performance short-circuit protection for industrial electrical systems, machinery and control panels where reliable three-phase circuit protection is essential.
