Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
2CDS273334R0488 ABB ST203M-Z20 MCB 15kA 3P Z 20A UL1077
ABB ST203M-Z20 is a 20 A three-pole Z-characteristic miniature circuit breaker with a 15 kA short-circuit breaking capacity designed for supplementary protection of sensitive industrial electrical and control equipment.
£96.65
Why Choose the ABB ST203M-Z20 Miniature Circuit Breaker?
The ABB ST203M-Z20 is a high-performance three-pole miniature circuit breaker (MCB) designed to provide dependable supplementary overcurrent and short-circuit protection for industrial equipment, control systems and sensitive electrical circuits. As part of the ABB ST200M miniature circuit breaker series, it combines reliable circuit protection with a compact modular format for professional DIN-rail installations.
Featuring a Z tripping characteristic, the ST203M-Z20 is particularly suited to circuits where a sensitive magnetic response is required and normal inrush currents are relatively low. This makes it a practical choice for electronic equipment, control circuits, instrumentation and other applications requiring responsive overcurrent protection.
With a rated current of 20 A, a three-pole configuration and a short-circuit breaking capacity of 15 kA, the ST203M-Z20 provides robust supplementary protection for three-pole equipment circuits. ABB order code 2CDS273334R0488 identifies this specific 20 A Z-characteristic model within ABB's UL 1077 miniature circuit breaker range.
Key Advantages
- Compact three-pole miniature circuit breaker for industrial and control applications.
- 20 A rated current suitable for equipment, automation and control circuits.
- 15 kA short-circuit breaking capacity for robust fault protection.
- Z tripping characteristic suited to sensitive circuits with relatively low inrush currents.
- Designed for UL 1077 supplementary circuit protection applications.
- DIN-rail format enables straightforward integration into electrical panels, machinery and automation equipment.
Key Features
- ABB ST200M miniature circuit breaker series.
- 20 A rated current.
- 3-pole configuration.
- Z tripping characteristic.
- 15 kA short-circuit breaking capacity.
- Thermal-magnetic circuit protection.
- Designed for UL 1077 supplementary protection.
- Compact modular construction for DIN-rail installation.
Responsive Protection for Sensitive Electrical Circuits
Miniature circuit breakers such as the ABB ST203M-Z20 automatically interrupt electrical current when an overload or short-circuit condition occurs. This helps protect conductors and connected equipment while providing resettable circuit protection that supports convenient fault recovery and maintenance in industrial installations.
The Z-characteristic response makes the ST203M-Z20 particularly appropriate for sensitive circuits where responsive magnetic protection is required. Combined with its 20 A rating and three-pole construction, it is well suited to supplementary protection of industrial control electronics, instrumentation, automation systems and other electrical equipment with relatively low normal inrush currents.
Typical Applications
- Industrial control and automation equipment.
- Electrical control panels and cabinets.
- Sensitive three-pole equipment circuits.
- Electronic control equipment.
- Instrumentation and measurement systems.
- OEM machinery requiring UL 1077 supplementary protection.
Technical Specifications
Tick the specs you need, then view products that match.
| Certification | UL 1077 | |
|---|---|---|
| Series | ST200M | |
| Order code | 2CDS273334R0488 | |
| Product type | Miniature circuit breaker (MCB) | |
| Rated current | 20 A | |
| Number of poles | 3 | |
| Number of protected poles | 3 | |
| Tripping characteristic | Z | |
| Short-circuit breaking capacity | 15 kA | |
| Protection principle | Thermal-magnetic | |
| Standard / product group | UL 489 / UL 1077 MCB | |
| Application standard | UL 1077 | |
| Mounting type | DIN rail | |
| Modular width | 3 modules |
Frequently Asked Questions
What is the ABB ST203M-Z20 used for?
The ST203M-Z20 is a three-pole miniature circuit breaker designed to provide supplementary overload and short-circuit protection for industrial equipment, control systems and sensitive electrical circuits.
What is the rated current of the ST203M-Z20?
The ABB ST203M-Z20 has a rated current of 20 A.
What does the Z characteristic mean?
The Z tripping characteristic provides a sensitive magnetic response and is suited to circuits with relatively low inrush currents, including electronic control, instrumentation and other sensitive electrical loads.
What is the breaking capacity of the ST203M-Z20?
The ST203M-Z20 has a 15 kA short-circuit breaking capacity, providing robust fault protection for suitable industrial equipment and supplementary circuit-protection applications.
What is the ABB order code for the ST203M-Z20?
The ABB order code for the ST203M-Z20 20 A three-pole Z-characteristic MCB is 2CDS273334R0488.
Trusted Circuit Protection from ABB
ABB ST200M miniature circuit breakers provide compact and dependable supplementary circuit protection for industrial machinery, electrical panels and automation equipment, combining reliable protection performance with a modular DIN-rail design.
