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2CDS273334R0081 ABB ST203M-D8 Miniature Circuit Breaker 3P D 8A
ABB ST203M-D8 is an 8 A three-pole D-characteristic miniature circuit breaker from the ST200M series designed for reliable supplementary overcurrent and short-circuit protection in industrial electrical equipment.
£93.65
Why Choose the ABB ST203M-D8 Miniature Circuit Breaker?
The ABB ST203M-D8 is a high-performance three-pole miniature circuit breaker (MCB) designed to provide dependable overcurrent and short-circuit protection in industrial electrical and control systems. As part of the robust ABB ST200M series, it combines an 8 A rated current with a D tripping characteristic for circuits with higher starting or inrush currents.
Designed for supplementary protection in accordance with UL 1077, the ST203M-D8 is suitable for industrial machinery, control panels and equipment where reliable circuit protection and convenient DIN-rail installation are required. Its thermal-magnetic operating principle provides automatic interruption in response to overloads and short circuits.
The ST203M-D8 features three protected poles, an 8 A current rating and a D tripping characteristic. It offers a rated ultimate short-circuit breaking capacity of 15 kA at 400 V AC under IEC/EN 60947-2 conditions, while its UL 1077 supplementary-protector rating supports applications in industrial equipment and machinery.
Key Advantages
- Reliable three-pole miniature circuit breaker for industrial circuit protection.
- 8 A rated current for low-current three-phase circuits and equipment.
- D tripping characteristic suitable for loads with relatively high starting currents.
- 15 kA breaking capacity at 400 V AC under IEC/EN 60947-2 conditions.
- UL 1077 supplementary protection for electrical equipment and control circuits.
- Compact modular construction for straightforward DIN-rail installation.
Key Features
- ABB ST200M miniature circuit breaker series.
- Three-pole configuration.
- 8 A rated current.
- D tripping characteristic.
- Thermal-magnetic overload and short-circuit protection.
- UL 1077 supplementary-protector compliance.
- Also designed to applicable IEC/EN 60947-2 and CSA 22.2 No. 235 requirements.
- 4 kV rated impulse withstand voltage.
Reliable Protection for Industrial Electrical Circuits
Miniature circuit breakers such as the ABB ST203M-D8 automatically disconnect a circuit when excessive current is caused by an overload or short circuit. This helps protect wiring and electrical equipment while allowing convenient reset and restoration of the circuit once the fault has been resolved.
The D characteristic is particularly useful for circuits containing equipment that can draw significant inrush current during start-up. Combined with the ST200M series' modular DIN-rail format, this makes the ST203M-D8 well suited to supplementary protection in machinery, automation equipment and industrial control panels.
Typical Applications
- Industrial machinery and automation equipment.
- Electrical control panels and switchboards.
- Motor and inductive-load control circuits.
- Industrial power distribution systems.
- OEM electrical equipment requiring supplementary protection.
- Circuits with elevated starting or inrush currents.
Technical Specifications
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| Certification | UL 1077 | |
|---|---|---|
| Series | ST200M | |
| ABB order code | 2CDS273334R0081 | |
| Product type | Miniature circuit breaker / supplementary protector | |
| Number of poles | 3 | |
| Rated current | 8 A | |
| Tripping characteristic | D | |
| Input voltage type | AC | |
| Rated operational voltage | 400 V AC | |
| Rated insulation voltage | 440 V | |
| Rated impulse withstand voltage | 4 kV | |
| Rated ultimate short-circuit breaking capacity | 15 kA at 400 V AC | |
| Standards | UL 1077, CSA 22.2 No. 235, IEC/EN 60947-2 | |
| Mounting type | DIN rail | |
| Weight | approx. 0.345 kg |
Frequently Asked Questions
What is the ABB ST203M-D8 used for?
The ST203M-D8 provides overload and short-circuit protection for industrial electrical equipment, machinery and control circuits.
What is the current rating of the ST203M-D8?
The ABB ST203M-D8 has a rated current of 8 A.
How many poles does the ST203M-D8 have?
The ST203M-D8 is a three-pole miniature circuit breaker, allowing simultaneous protection and switching of three conductors.
What does the D characteristic mean?
The D tripping characteristic is intended for circuits that can experience relatively high short-duration starting or inrush currents, such as certain motors, transformers and industrial loads.
Does the ABB ST203M-D8 comply with UL 1077?
Yes. The ST203M-D8 is designed for UL 1077 supplementary protection and is also specified to applicable IEC/EN 60947-2 and CSA 22.2 No. 235 requirements.
Trusted Industrial Circuit Protection from ABB
ABB ST200M miniature circuit breakers provide compact and dependable supplementary circuit protection for industrial machinery, automation equipment and electrical control systems where reliable switching and overcurrent protection are essential.
