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2CDS272334R0488 ABB ST202M-Z20 Miniature Circuit Breaker 2P Z 20 A UL1077
ABB ST202M-Z20 is a 20 A two-pole Z-characteristic miniature circuit breaker and UL 1077 supplementary protector designed for sensitive industrial equipment and electrical sub-circuit protection.
£63.65
Why Choose the ABB ST202M-Z20 Miniature Circuit Breaker?
The ABB ST202M-Z20 is a high-performance 2-pole miniature circuit breaker (MCB) designed to provide supplementary overcurrent and short-circuit protection for industrial control equipment and electrical sub-circuits. As part of the ABB ST200M series, it combines compact DIN-rail installation with sensitive Z-characteristic thermal-magnetic tripping and compliance with UL 1077 requirements.
With a rated current of 20 A, the ST202M-Z20 is particularly suited to circuits where rapid magnetic operation is required to protect sensitive equipment. Its Z tripping characteristic responds at a lower multiple of rated current than general-purpose characteristics, making it useful for electronic equipment, control circuits and other loads with comparatively low short-circuit current levels.
The ST202M-Z20 provides an ultimate short-circuit breaking capacity of 15 kA at 400 V AC according to IEC 60947-2. Its two-pole construction provides simultaneous switching and protection of two conductors, making it a practical solution for industrial automation, machinery and control panels requiring dependable supplementary circuit protection.
Key Advantages
- Compact 2-pole miniature circuit breaker for supplementary overcurrent protection.
- 20 A rated current for industrial equipment and control circuits.
- Z tripping characteristic provides sensitive magnetic protection for appropriate loads.
- 15 kA ultimate short-circuit breaking capacity at 400 V AC according to IEC 60947-2.
- Designed for UL 1077 supplementary protection applications.
- DIN-rail modular construction supports efficient installation in electrical control panels.
Key Features
- ABB ST200M miniature circuit breaker series.
- 2-pole configuration.
- 20 A rated current.
- Z characteristic thermal-magnetic tripping.
- 400 V AC rated operational voltage according to IEC 60947-2.
- 440 V rated insulation voltage.
- 4 kV rated impulse withstand voltage.
- 15 kA ultimate breaking capacity at 400 V AC.
- Compact modular construction for DIN-rail mounting.
- Suitable for supplementary protection of sensitive industrial equipment and control circuits.
Sensitive Supplementary Protection for Industrial Circuits
Miniature circuit breakers such as the ABB ST202M-Z20 automatically disconnect a circuit when excessive current caused by an overload or short circuit is detected. This helps protect downstream equipment and conductors while allowing straightforward manual resetting after the electrical fault has been identified and corrected.
The Z characteristic provides comparatively sensitive instantaneous magnetic operation, making the ST202M-Z20 particularly appropriate for selected electronic equipment, control circuits and other applications where available fault currents may be relatively low. Its compact modular construction allows efficient integration into DIN-rail control cabinets and automation assemblies.
Typical Applications
- Industrial automation and machinery control panels.
- Electronic equipment and sensitive electrical loads.
- Control and instrumentation circuits.
- Industrial power supplies and automation equipment.
- Electrical sub-circuits requiring supplementary overcurrent protection.
- OEM machinery and control cabinet installations.
Technical Specifications
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| Certification | UL 1077 | |
|---|---|---|
| Series | ST200M | |
| ABB order code | 2CDS272334R0488 | |
| Product type | Miniature circuit breaker / supplementary protector | |
| Number of poles | 2P | |
| Number of protected poles | 2 | |
| Rated current | 20 A | |
| Tripping characteristic | Z | |
| Rated operational voltage | 400 V AC according to IEC 60947-2 | |
| Rated insulation voltage (Ui) | 440 V | |
| Rated impulse withstand voltage (Uimp) | 4 kV | |
| Rated frequency | 50 / 60 Hz | |
| Ultimate short-circuit breaking capacity (Icu) | 15 kA at 400 V AC | |
| Service short-circuit breaking capacity (Ics) | 11.2 kA at 400 V AC | |
| Standard | UL 1077 | |
| Mounting type | DIN rail | |
| Modular width | 2 modules |
Frequently Asked Questions
What is the ABB ST202M-Z20 used for?
The ST202M-Z20 is a 2-pole supplementary miniature circuit breaker used to protect industrial equipment and electrical sub-circuits against overload and short-circuit currents.
What is the rated current of the ABB ST202M-Z20?
The ST202M-Z20 has a rated current of 20 A.
What does the Z characteristic mean?
The Z tripping characteristic provides sensitive instantaneous magnetic operation and is suited to appropriate electronic, control and other loads where rapid response to overcurrent is required.
What is the breaking capacity of the ST202M-Z20?
The ST202M-Z20 has an ultimate short-circuit breaking capacity of 15 kA at 400 V AC according to IEC 60947-2.
Is the ABB ST202M-Z20 a UL 1077 supplementary protector?
Yes. The ST202M-Z20 is designed for UL 1077 supplementary overcurrent protection applications where the required branch-circuit protection is provided separately.
Trusted Circuit Protection from ABB
ABB ST200M miniature circuit breakers provide dependable supplementary protection for industrial control systems, machinery and electrical equipment, combining compact DIN-rail installation with established ABB circuit-protection technology.
