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2CDS273334R0158 ABB ST203M-Z0.5 Miniature Circuit Breaker 15 kA 3P Z 0.5 A UL1077
ABB ST203M-Z0.5 is a 0.5 A three-pole Z-curve miniature circuit breaker with 15 kA breaking capacity, designed for sensitive supplementary overload and short-circuit protection in UL 1077 applications.
£100.86
Why Choose the ABB ST203M-Z0.5 Miniature Circuit Breaker?
The ABB ST203M-Z0.5 is a high-performance three-pole miniature circuit breaker (MCB) designed to provide reliable supplementary overload and short-circuit protection for sensitive electrical circuits and equipment. As part of the robust ABB ST200M series, it combines a Z tripping characteristic, 0.5 A rated current and three poles in a compact DIN-rail mounting format.
Designed for supplementary protection applications in accordance with UL 1077, the ST203M-Z0.5 is particularly suitable for sensitive control, electronic and instrumentation circuits where rapid response to overcurrent conditions is required. Its Z characteristic provides a lower instantaneous magnetic trip threshold than conventional B, C or D characteristics, helping protect sensitive loads and circuit components.
With a rated current of 0.5 A, a 15 kA short-circuit breaking capacity and three-pole configuration, the ST203M-Z0.5 provides dependable protection for low-current multi-pole circuits. Its compact modular construction supports straightforward installation inside electrical control panels, machinery cabinets and industrial automation systems.
Key Advantages
- Reliable three-pole miniature circuit breaker for supplementary circuit protection.
- 0.5 A rated current suitable for sensitive low-current circuits.
- Z tripping characteristic for rapid response to comparatively low overcurrents.
- 15 kA short-circuit breaking capacity for robust fault protection.
- Designed for supplementary protection in accordance with UL 1077.
- Compact modular construction for straightforward DIN-rail installation.
Key Features
- ABB ST200M miniature circuit breaker series.
- 0.5 A rated current.
- Three-pole configuration.
- Z tripping characteristic.
- 15 kA breaking capacity.
- Thermal-magnetic overload and short-circuit protection.
- Sensitive magnetic tripping characteristic for electronic and control circuits.
- Compact DIN-rail mounting design for electrical control panels.
Sensitive Circuit Protection for Industrial Equipment
Miniature circuit breakers such as the ABB ST203M-Z0.5 automatically disconnect a circuit when excessive current occurs due to an overload or short circuit. Thermal and magnetic tripping mechanisms provide protection against sustained overloads and fault currents while allowing the breaker to be reset after the cause of the fault has been corrected.
The Z tripping characteristic is intended for applications requiring a sensitive instantaneous response to overcurrent. This makes the ST203M-Z0.5 well suited to electronic equipment, control systems, instrumentation and other low-current circuits where limiting fault current exposure can help protect sensitive components.
Typical Applications
- Industrial automation and control circuits.
- Electronic equipment and sensitive loads.
- Instrumentation and measurement circuits.
- PLC and industrial control panel circuits.
- Low-current auxiliary and signalling circuits.
- Supplementary overcurrent protection applications requiring UL 1077 compliance.
Technical Specifications
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| Certification | UL 1077 | |
|---|---|---|
| Series | ST200M | |
| ABB order code | 2CDS273334R0158 | |
| Product type | Miniature circuit breaker (MCB) / supplementary protector | |
| Rated current | 0.5 A | |
| Number of poles | 3 | |
| Tripping characteristic | Z | |
| Short-circuit breaking capacity | 15 kA | |
| Protection principle | Thermal-magnetic | |
| Standard | UL 1077 | |
| Mounting type | DIN-rail mounting |
Frequently Asked Questions
What is the ABB ST203M-Z0.5 used for?
The ST203M-Z0.5 is a three-pole miniature circuit breaker designed to provide supplementary overload and short-circuit protection for sensitive low-current electrical, electronic and control circuits.
What is the rated current of the ST203M-Z0.5?
The ABB ST203M-Z0.5 has a rated current of 0.5 A.
What does the Z tripping characteristic mean?
The Z tripping characteristic provides a sensitive instantaneous response to overcurrent, making the breaker particularly suitable for electronic, instrumentation and control circuits with low permissible fault currents.
What is the breaking capacity of the ABB ST203M-Z0.5?
The ST203M-Z0.5 has a specified short-circuit breaking capacity of 15 kA, providing robust fault protection for its intended circuits.
Is the ABB ST203M-Z0.5 a UL 1077 supplementary protector?
Yes. The ST203M-Z0.5 is designed for UL 1077 supplementary protection applications within electrical equipment and control systems.
Trusted by Electrical and Automation Professionals
ABB ST200M miniature circuit breakers provide compact and dependable supplementary circuit protection for industrial machinery, control panels, electronics and automation systems where reliable overcurrent protection and straightforward DIN-rail integration are required.
