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2CDS273334R0255 ABB ST203M-B25 Miniature Circuit Breaker 3P B 25A
ABB ST203M-B25 is a 25 A three-pole B-characteristic miniature circuit breaker with 15 kA breaking capacity designed for UL 1077 supplementary overcurrent and short-circuit protection.
£72.08
Why Choose the ABB ST203M-B25 Miniature Circuit Breaker?
The ABB ST203M-B25 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 a 25 A rated current with a B tripping characteristic for reliable protection of circuits with relatively low starting and inrush currents.
Designed for supplementary protection in accordance with UL 1077, the ST203M-B25 is suitable for industrial machinery, control panels and electrical 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-B25 features three protected poles, a 25 A current rating and a B tripping characteristic. With a 15 kA short-circuit breaking capacity, it provides robust supplementary circuit protection for industrial equipment and automation applications.
Key Advantages
- Reliable three-pole miniature circuit breaker for industrial circuit protection.
- 25 A rated current for three-phase circuits and equipment.
- B tripping characteristic suitable for circuits with relatively low inrush currents.
- 15 kA short-circuit breaking capacity for robust fault protection.
- 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.
- 25 A rated current.
- B tripping characteristic.
- 15 kA breaking capacity.
- Thermal-magnetic overload and short-circuit protection.
- UL 1077 supplementary-protector classification.
- Compact modular format for industrial electrical installations.
Reliable Protection for Industrial Electrical Circuits
Miniature circuit breakers such as the ABB ST203M-B25 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 B characteristic provides sensitive magnetic tripping for circuits where high start-up currents are not normally expected. Combined with the ST200M series' modular DIN-rail format, this makes the ST203M-B25 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.
- Control and auxiliary circuits.
- Industrial electrical distribution equipment.
- OEM equipment requiring supplementary circuit protection.
- Circuits with relatively low starting and inrush currents.
Technical Specifications
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| Certification | UL 1077 | |
|---|---|---|
| Series | ST200M | |
| ABB order code | 2CDS273334R0255 | |
| Product type | Miniature circuit breaker / supplementary protector | |
| Number of poles | 3 | |
| Rated current | 25 A | |
| Tripping characteristic | B | |
| Short-circuit breaking capacity | 15 kA | |
| Protection principle | Thermal-magnetic | |
| Standard / approval | UL 1077 | |
| Mounting type | DIN rail |
Frequently Asked Questions
What is the ABB ST203M-B25 used for?
The ST203M-B25 provides overload and short-circuit protection for industrial electrical equipment, machinery and control circuits.
What is the current rating of the ST203M-B25?
The ABB ST203M-B25 has a rated current of 25 A.
How many poles does the ST203M-B25 have?
The ST203M-B25 is a three-pole miniature circuit breaker, allowing simultaneous protection and switching of three conductors.
What does the B characteristic mean?
The B tripping characteristic is suited to circuits with relatively low short-duration starting or inrush currents, providing sensitive magnetic protection against high fault currents.
Does the ABB ST203M-B25 comply with UL 1077?
Yes. The ST203M-B25 is designed as a UL 1077 supplementary protector for use within electrical equipment and industrial control systems.
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.
