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.
2CDS273334R0011 ABB ST203M-D1 1 A 3-Pole D Curve 15 kA UL1077 Miniature Circuit Breaker
ABB ST203M-D1 is a 1 A, 3-pole D-curve miniature circuit breaker with 15 kA breaking capacity and UL 1077 classification for supplementary overcurrent protection of industrial and OEM equipment circuits.
£93.65
Why Choose the ABB ST203M-D1 Miniature Circuit Breaker?
The ABB ST203M-D1 is a high-performance 3-pole miniature circuit breaker (MCB) designed to provide reliable supplementary overcurrent protection in industrial, commercial and OEM electrical equipment. Part of the ABB ST200M range, it combines thermal-magnetic overload and short-circuit protection with a compact modular format for DIN rail-mounted installations.
Featuring a D tripping characteristic and a rated current of 1 A, the ST203M-D1 is particularly suited to low-current circuits supplying equipment with comparatively high normal inrush currents. The D characteristic helps accommodate start-up peaks associated with transformers, solenoids and other inductive equipment while maintaining dependable protection against sustained overloads and short circuits.
The ST203M-D1 provides three protected poles and a 15 kA interrupting capability within the ST200M platform, while its North American certification is for UL 1077 supplementary protection. ABB's ordering data confirms the ST203M-D1 configuration at 1 A, three poles and an approximate unit weight of 0.345 kg.
Key Advantages
- Reliable 3-pole supplementary overcurrent protection.
- Low 1 A rated current for control, auxiliary and equipment circuits.
- D tripping characteristic suited to loads with comparatively high normal inrush currents.
- 15 kA high breaking-capacity ST200M design.
- UL 1077 supplementary protector classification.
- Compact modular construction for DIN rail-mounted electrical equipment.
Key Features
- ABB ST200M series.
- 3-pole configuration.
- 1 A rated current.
- Type D tripping characteristic.
- 15 kA breaking capacity.
- Thermal-magnetic overload and short-circuit protection.
- Suitable for equipment circuits with elevated normal inrush currents.
- Compact DIN rail-mounted construction.
- Approximate unit weight of 0.345 kg.
Supplementary Protection for High-Inrush Equipment
The ABB ST203M-D1 provides resettable thermal-magnetic protection by disconnecting the protected equipment circuit when overload or short-circuit conditions occur. Its three-pole configuration enables simultaneous protection of three conductors, making it particularly useful for three-phase control and equipment applications requiring a low 1 A current rating.
The D tripping characteristic is intended for applications where normal energisation can produce substantial transient current. This makes the ST203M-D1 suitable for appropriately engineered circuits supplying transformers, solenoids and other inductive equipment where a more inrush-tolerant characteristic is required. As a UL 1077 device, it is intended for supplementary protection within equipment rather than as a substitute for a UL 489 branch-circuit breaker where one is required.
Typical Applications
- Industrial control and automation equipment.
- Low-current three-phase equipment circuits.
- Transformer and inductive-load circuits.
- Solenoids and electromagnetic equipment.
- Industrial electrical control panels.
- OEM machinery requiring UL 1077 supplementary protection.
Technical Specifications
Tick the specs you need, then view products that match.
| Certification | UL 1077 | |
|---|---|---|
| Series | ST200M | |
| ABB order code | 2CDS273334R0011 | |
| Product type | Miniature circuit breaker / supplementary protector | |
| Product main type | ST200M | |
| Number of poles | 3 | |
| Number of protected poles | 3 | |
| Rated current | 1 A | |
| Tripping characteristic | D | |
| Breaking capacity | 15 kA | |
| Protection function | Overload and short-circuit protection | |
| North American classification | UL 1077 supplementary protector | |
| Mounting type | DIN rail | |
| Weight | approx. 0.345 kg | |
| Product group | UL489 / UL1077 MCB |
Frequently Asked Questions
What is the ABB ST203M-D1 used for?
The ST203M-D1 is a 3-pole supplementary miniature circuit breaker designed to protect equipment circuits against overload and short-circuit conditions, particularly applications requiring a low current rating and tolerance of elevated normal inrush currents.
What is the current rating of the ST203M-D1?
The ABB ST203M-D1 has a rated current of 1 A and uses a D tripping characteristic.
What is the breaking capacity of the ST203M-D1?
The ABB ST203M-D1 is specified as a 15 kA ST200M miniature circuit breaker, providing high short-circuit breaking capability for compatible supplementary protection applications.
What is a D characteristic miniature circuit breaker used for?
A D characteristic MCB is suited to equipment with comparatively high normal starting or inrush currents, including transformers, solenoids and other inductive loads, while still providing overload and short-circuit protection.
Is the ABB ST203M-D1 a UL 489 branch-circuit breaker?
No. The ST203M-D1 is specified to UL 1077 for supplementary overcurrent protection within equipment. It should not be used as a substitute for a UL 489 branch-circuit breaker where branch-circuit protection is required by the applicable installation standard.
Trusted Circuit Protection from ABB
ABB ST200M miniature circuit breakers provide dependable supplementary overcurrent protection for industrial, commercial and OEM electrical equipment, combining compact modular construction with multiple tripping characteristics and current ratings for a broad range of control and equipment applications.
