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2CDS273334R0025 ABB ST203M-B2 Miniature Circuit Breaker 3P B 2A 15kA UL1077
ABB ST203M-B2 is a 3-pole 2 A B-characteristic thermal-magnetic miniature circuit breaker with a 15 kA interrupting rating for UL 1077 supplementary overcurrent protection.
£72.08
Why Choose the ABB ST203M-B2 Miniature Circuit Breaker?
The ABB ST203M-B2 is a compact 3-pole miniature circuit breaker (MCB) designed to provide supplementary overcurrent protection for industrial machinery, automation equipment and electrical control panels. As part of the ABB ST200M range, it combines a 2 A rated current, B tripping characteristic and UL 1077 compliance for dependable industrial circuit protection.
The ST203M-B2 provides thermal-magnetic protection against overloads and short circuits, helping protect suitable conductors and connected equipment from damaging overcurrent conditions. Its B characteristic provides a relatively sensitive magnetic response and is suited to circuits with low starting or inrush currents.
With a 3-pole configuration, 2 A rated current and 15 kA interrupting rating, the ST203M-B2 provides coordinated protection across three conductors in compact industrial installations. Its modular construction supports convenient DIN rail installation within machinery cabinets, control panels and automation systems.
Key Advantages
- Compact 3-pole miniature circuit breaker for supplementary overcurrent protection.
- 2 A rated current for low-current industrial and control circuits.
- B tripping characteristic suited to circuits with low starting or inrush currents.
- 15 kA interrupting rating for robust short-circuit protection.
- UL 1077 supplementary protector classification.
- Thermal-magnetic protection against overload and short-circuit conditions.
- DIN rail format for efficient integration into industrial control panels.
Key Features
- ABB ST200M miniature circuit breaker range.
- 3-pole configuration.
- 2 A rated current.
- B characteristic thermal-magnetic tripping.
- 15 kA interrupting rating.
- Designed for supplementary overcurrent protection.
- Resettable protection following clearance of a fault condition.
- Modular construction for DIN rail mounting.
Reliable Supplementary Protection for Industrial Circuits
The ABB ST203M-B2 automatically disconnects a protected circuit when an overload or short circuit causes current to exceed its operating limits. Its thermal-magnetic mechanism combines overload protection with rapid response to short-circuit conditions, while the resettable design allows service to be restored after the fault has been corrected.
The B characteristic makes the ST203M-B2 suitable for circuits where high starting currents are not normally expected and a relatively sensitive magnetic response is appropriate. Its three-pole arrangement makes it useful where coordinated supplementary protection is required across three conductors within machinery, automation and control equipment.
Typical Applications
- Industrial machinery and machine control panels.
- Automation and process control equipment.
- Supplementary overcurrent protection in UL 1077 applications.
- Low-current three-pole control circuits.
- Circuits with low starting or inrush currents.
- Industrial electrical and automation assemblies.
Technical Specifications
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| Certification | UL 1077 | |
|---|---|---|
| Series | ST200M | |
| ABB order code | 2CDS273334R0025 | |
| Product type | Miniature circuit breaker / supplementary protector | |
| Number of poles | 3 | |
| Rated current | 2 A | |
| Tripping characteristic | B | |
| Interrupting rating | 15 kA | |
| Operating principle | Thermal-magnetic | |
| Mounting type | DIN rail | |
| Standard | UL 1077 |
Frequently Asked Questions
What is the ABB ST203M-B2 used for?
The ST203M-B2 is a 3-pole miniature circuit breaker and supplementary protector designed to provide overload and short-circuit protection for suitable industrial machinery, automation and control circuits.
What is the current rating of the ST203M-B2?
The ABB ST203M-B2 has a rated current of 2 A.
What does the B characteristic mean?
The B tripping characteristic provides a relatively sensitive magnetic response and is suited to electrical circuits where low starting or inrush currents are expected.
What is the interrupting rating of the ST203M-B2?
The ABB ST203M-B2 has a specified interrupting rating of 15 kA.
Which standard applies to the ABB ST203M-B2?
The ST203M-B2 is specified as a UL 1077 supplementary protector for use within appropriate electrical equipment and applications.
Trusted Industrial Circuit Protection from ABB
ABB miniature circuit breakers and supplementary protectors provide dependable overcurrent protection for industrial machinery, automation equipment and control systems requiring compact, resettable electrical protection.
