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.
2CDS273337R0578 ABB SU203M-Z50 Miniature Circuit Breaker 3P Z 50A 10kA UL489
ABB SU203M-Z50 is a 50 A three-pole Type Z miniature circuit breaker with a 10 kA UL 489 interrupting rating for sensitive branch-circuit protection in industrial control and electronic applications.
£225.68
Why Choose the ABB SU203M-Z50 Miniature Circuit Breaker?
The ABB SU203M-Z50 is a high-performance three-pole miniature circuit breaker (MCB) designed to provide reliable branch-circuit overcurrent and short-circuit protection in industrial and commercial electrical installations. As part of the ABB System pro M compact SU200M series, it combines compact modular construction with UL 489 compliance for demanding electrical distribution and control applications.
Featuring a Z tripping characteristic, the SU203M-Z50 provides sensitive magnetic protection suited to circuits containing electronic equipment, semiconductor devices and other loads requiring rapid response to relatively low short-circuit currents. Its three protected poles provide simultaneous protection and isolation of three-phase circuits, while its DIN rail format enables straightforward integration into electrical control panels.
With a rated current of 50 A and a 10 kA UL 489 interrupting rating, the SU203M-Z50 provides dependable protection for sensitive branch circuits. Its combination of thermal-magnetic protection, Type Z response and compact three-pole construction makes it particularly suitable for industrial control, automation and electronic equipment applications.
Key Advantages
- Reliable UL 489 branch-circuit protection for industrial and commercial installations.
- 50 A rated current for three-phase electrical circuits.
- Three-pole configuration for simultaneous protection and isolation.
- Z tripping characteristic for sensitive overcurrent protection.
- 10 kA UL 489 interrupting rating for dependable short-circuit protection.
- Compact DIN rail design simplifies integration into control panels and distribution systems.
Key Features
- ABB System pro M compact SU200M series.
- 50 A rated current.
- 3 poles / 3 protected poles.
- Type Z tripping characteristic.
- 10 kA UL 489 interrupting rating.
- Thermal-magnetic protection against overloads and short circuits.
- Designed for branch-circuit protection under UL 489.
- Well suited to sensitive electronic, control and semiconductor circuits.
- DIN rail mounting for modular electrical distribution systems.
Sensitive Protection for Control and Electronic Circuits
Miniature circuit breakers such as the ABB SU203M-Z50 automatically interrupt a circuit when excessive current occurs because of an overload or short circuit. Thermal-magnetic operation provides resettable protection for conductors and connected equipment while helping minimise damage caused by electrical faults.
The Z characteristic provides a sensitive instantaneous response compared with characteristics intended for loads with substantial starting currents. This makes the SU203M-Z50 particularly useful for electronic equipment, control circuits and semiconductor-based loads where rapid interruption of relatively low fault currents is desirable.
Typical Applications
- Industrial electrical control panels.
- Sensitive electronic equipment circuits.
- Semiconductor and automation equipment protection.
- Control and instrumentation circuits.
- Industrial machinery and factory automation.
- OEM equipment and machine building.
Technical Specifications
Tick the specs you need, then view products that match.
| Certification | UL 489 | |
|---|---|---|
| Series | System pro M compact SU200M | |
| ABB order code | 2CDS273337R0578 | |
| Product type | Miniature circuit breaker (MCB) | |
| Rated current | 50 A | |
| Number of poles | 3 | |
| Number of protected poles | 3 | |
| Tripping characteristic | Z | |
| UL 489 interrupting rating | 10 kA | |
| Rated operational voltage (IEC) | 400 V AC | |
| Rated insulation voltage (Ui) | 440 V | |
| Rated impulse withstand voltage (Uimp) | 4 kV | |
| Rated ultimate short-circuit breaking capacity (Icu) at 400 V AC | 15 kA | |
| Rated service short-circuit breaking capacity (Ics) at 400 V AC | 11.2 kA | |
| Frequency | 50 / 60 Hz | |
| Mounting | 35 mm DIN rail | |
| Dimensions (W × H × D) | 52.5 × 111 × 69 mm | |
| Standards | UL 489, CSA 22.2 No. 5, IEC/EN 60947-2 |
Frequently Asked Questions
What is the ABB SU203M-Z50 used for?
The SU203M-Z50 is a three-pole miniature circuit breaker used to protect branch circuits against overload and short-circuit currents, particularly circuits supplying sensitive electronic and control equipment.
What is the rated current of the SU203M-Z50?
The ABB SU203M-Z50 has a rated current of 50 A.
What does the Z tripping characteristic mean?
The Type Z characteristic provides sensitive magnetic tripping and is particularly suited to electronic, semiconductor and control circuits requiring rapid response to relatively low fault currents.
Is the ABB SU203M-Z50 UL 489 compliant?
Yes. The SU203M-Z50 is a UL 489 miniature circuit breaker designed for branch-circuit protection applications.
What is the interrupting rating of the SU203M-Z50?
The SU203M-Z50 has a 10 kA UL 489 interrupting rating, providing dependable short-circuit protection for appropriately rated electrical systems.
Trusted ABB Circuit Protection
ABB System pro M compact SU200M miniature circuit breakers provide dependable modular circuit protection for industrial control panels, automation equipment and electrical distribution systems requiring reliable overload and short-circuit protection.
