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2CDS273334R0085 ABB ST203M-B8 Miniature Circuit Breaker 8 A 3P B 15 kA UL1077
ABB ST203M-B8 is an 8 A 3-pole B-characteristic miniature circuit breaker with a 15 kA short-circuit rating for UL 1077 supplementary overcurrent protection.
£72.08
Why Choose the ABB ST203M-B8 Miniature Circuit Breaker?
The ABB ST203M-B8 is a compact 3-pole miniature circuit breaker (MCB) designed for supplementary overcurrent and short-circuit protection in industrial machinery, control panels and electrical equipment. As part of the ABB ST200M series, it combines an 8 A rated current with B-characteristic tripping and compliance with the UL 1077 standard.
The ST203M-B8 uses thermal-magnetic protection to respond to sustained overloads and short-circuit faults. Its B tripping characteristic provides relatively sensitive magnetic operation, making it suitable for circuits with low starting or inrush currents, including control, instrumentation and resistive-load applications.
With a 3-pole configuration, 8 A rated current and 15 kA short-circuit rating, the ST203M-B8 provides dependable supplementary protection for three-pole industrial circuits. ABB order code 2CDS273334R0085 identifies this specific ST200M configuration.
Key Advantages
- Reliable 3-pole supplementary circuit protection for industrial equipment.
- 8 A rated current suited to control, instrumentation and equipment circuits.
- B tripping characteristic for circuits with relatively low starting or inrush currents.
- 15 kA short-circuit rating for robust fault protection.
- UL 1077 compliant for supplementary overcurrent protection.
- Compact modular construction for integration into industrial control panels.
Key Features
- ABB ST200M miniature circuit breaker series.
- 3-pole configuration.
- 8 A rated current.
- B-characteristic thermal-magnetic tripping.
- 15 kA short-circuit rating.
- Designed for supplementary overcurrent and short-circuit protection.
- Suitable for industrial control, instrumentation and equipment circuits with low inrush currents.
- Compact modular design for electrical control and automation assemblies.
Reliable Supplementary Protection for Industrial Equipment
Miniature circuit breakers such as the ABB ST203M-B8 protect conductors and connected equipment by automatically interrupting current during overload or short-circuit conditions. Thermal protection responds to sustained overloads, while the magnetic trip mechanism provides rapid operation when significant fault currents occur.
The B tripping characteristic provides sensitive magnetic fault protection for circuits where normal operation produces relatively low inrush currents. Combined with its UL 1077 supplementary protection classification, the ST203M-B8 is well suited to industrial control, instrumentation and equipment circuits requiring compact and resettable overcurrent protection.
Typical Applications
- Industrial machinery and machine control panels.
- Industrial control circuits.
- Instrumentation and monitoring equipment.
- Resistive and low-inrush electrical loads.
- Electrical equipment requiring supplementary protection.
- OEM control assemblies using UL 1077 supplementary protectors.
Technical Specifications
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| Certification | UL 1077 | |
|---|---|---|
| Series | ST200M | |
| ABB order code | 2CDS273334R0085 | |
| Product type | Miniature circuit breaker (MCB) | |
| Number of poles | 3 | |
| Rated current | 8 A | |
| Tripping characteristic | B | |
| Trip technology | Thermal-magnetic | |
| Short-circuit rating | 15 kA | |
| Standard | UL 1077 | |
| Application | Supplementary overcurrent protection |
Frequently Asked Questions
What is the ABB ST203M-B8 used for?
The ST203M-B8 is a 3-pole miniature circuit breaker designed to provide supplementary overload and short-circuit protection for industrial control, instrumentation, machinery and electrical equipment circuits.
What is the rated current of the ST203M-B8?
The ABB ST203M-B8 has a rated current of 8 A.
What does the B characteristic mean?
The B tripping characteristic provides relatively sensitive magnetic operation and is suited to circuits with low starting or inrush currents, including control, instrumentation and resistive loads.
What is the short-circuit rating of the ST203M-B8?
The ST203M-B8 has a 15 kA short-circuit rating.
What is the ABB order code for the ST203M-B8?
The ABB order code for the ST203M-B8 is 2CDS273334R0085.
Trusted Industrial Circuit Protection from ABB
ABB ST200M miniature circuit breakers provide dependable supplementary overcurrent and short-circuit protection for industrial control panels, machinery and electrical equipment, combining compact construction with proven thermal-magnetic protection technology.
