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2CDS273334R0504 ABB ST203M-C50 Miniature Circuit Breaker 15 kA 3P C 50 A UL1077
ABB ST203M-C50 is a 50 A three-pole C-curve miniature circuit breaker with 15 kA breaking capacity, designed for reliable supplementary overload and short-circuit protection in UL 1077 applications.
£103.60
Why Choose the ABB ST203M-C50 Miniature Circuit Breaker?
The ABB ST203M-C50 is a high-performance three-pole miniature circuit breaker (MCB) designed to provide reliable supplementary overload and short-circuit protection for electrical circuits and equipment. As part of the robust ABB ST200M series, it combines a C tripping characteristic, 50 A rated current and three poles in a compact modular format.
Designed for supplementary protection applications in accordance with UL 1077, the ST203M-C50 is well suited to industrial control panels, machinery and automation equipment. Its C characteristic provides a practical balance between responsive overcurrent protection and tolerance of moderate starting or inrush currents, making it suitable for a broad range of industrial loads and control circuits.
With a rated current of 50 A, a 15 kA short-circuit breaking capacity and three-pole configuration, the ST203M-C50 provides dependable protection for multi-pole circuits. Its compact modular construction supports straightforward DIN-rail installation inside electrical control panels, machinery cabinets and industrial automation systems.
Key Advantages
- Reliable three-pole miniature circuit breaker for supplementary circuit protection.
- 50 A rated current for industrial and control circuits.
- C tripping characteristic suitable for loads with moderate starting or inrush currents.
- 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.
- 50 A rated current.
- Three-pole configuration.
- C tripping characteristic.
- 15 kA breaking capacity.
- Thermal-magnetic overload and short-circuit protection.
- Resettable circuit protection for convenient restoration after fault clearance.
- Compact DIN-rail mounting design for electrical control panels.
Reliable Circuit Protection for Industrial Equipment
Miniature circuit breakers such as the ABB ST203M-C50 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 high fault currents, helping safeguard wiring, control equipment and connected loads.
The C tripping characteristic is widely used for circuits where normal operation can produce moderate current peaks. This makes the ST203M-C50 suitable for many industrial control, machinery and automation applications where dependable protection is required while accommodating normal equipment start-up currents.
Typical Applications
- Industrial machinery and automation control panels.
- Three-phase control and auxiliary circuits.
- Loads with moderate starting or inrush currents.
- Electrical distribution and control cabinets.
- OEM machinery and production equipment.
- Supplementary overcurrent protection applications requiring UL 1077 compliance.
Technical Specifications
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| Certification | UL 1077 | |
|---|---|---|
| Series | ST200M | |
| ABB order code | 2CDS273334R0504 | |
| Product type | Miniature circuit breaker (MCB) / supplementary protector | |
| Rated current | 50 A | |
| Number of poles | 3 | |
| Tripping characteristic | C | |
| 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-C50 used for?
The ST203M-C50 is a three-pole miniature circuit breaker designed to provide supplementary overload and short-circuit protection for electrical circuits, industrial control equipment and machinery.
What is the rated current of the ST203M-C50?
The ABB ST203M-C50 has a rated current of 50 A.
What tripping characteristic does the ST203M-C50 have?
The ST203M-C50 has a C tripping characteristic, making it suitable for circuits and loads that can experience moderate starting or inrush currents.
What is the breaking capacity of the ABB ST203M-C50?
The ST203M-C50 has a specified short-circuit breaking capacity of 15 kA, providing robust fault protection for industrial electrical circuits.
Is the ABB ST203M-C50 a UL 1077 supplementary protector?
Yes. The ST203M-C50 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 and automation systems where reliable overcurrent protection and straightforward DIN-rail integration are required.
