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.
2CDS273334R0635 ABB ST203M-B63 Miniature Circuit Breaker 63 A 3P B Curve 15 kA
ABB ST203M-B63 is a 63 A three-pole B-curve ST200M miniature circuit breaker with 15 kA short-circuit breaking capacity and UL 1077 supplementary protection for industrial electrical equipment and control systems.
£102.08
Why Choose the ABB ST203M-B63 Miniature Circuit Breaker?
The ABB ST203M-B63 is a high-performance three-pole miniature circuit breaker (MCB) designed to provide reliable supplementary overcurrent and short-circuit protection in industrial electrical equipment, machinery and control systems. As part of the ABB ST200M series, it combines a 63 A rated current with B-curve tripping characteristics and UL 1077 supplementary protection capability.
Designed for modular DIN rail installations, the ST203M-B63 provides thermal-magnetic protection against overloads and short circuits. Its B tripping characteristic provides rapid magnetic operation for circuits with relatively low inrush currents, making it particularly suitable for resistive loads, control circuits and other applications where sensitive overcurrent protection is required.
With a 63 A rated current, three-pole configuration and high short-circuit performance, the ST203M-B63 is engineered for demanding industrial applications. The ST200M series provides supplementary protection according to UL 1077 and offers interrupting capacity of up to 10 kA at 480Y/277 V AC and 125 V DC, while the ST203M-B63 is specified with a 15 kA IEC/EN 60947-2 ultimate short-circuit breaking capacity.
Key Advantages
- Reliable three-pole miniature circuit breaker for industrial supplementary protection.
- 63 A rated current for higher-current electrical circuits.
- B-curve tripping characteristic for rapid response to short-circuit currents.
- 15 kA short-circuit breaking capacity for demanding protection applications.
- UL 1077 supplementary protection for industrial equipment and control circuits.
- Compact modular construction for straightforward DIN rail mounting.
Key Features
- ABB ST200M miniature circuit breaker series.
- 63 A rated current.
- Three-pole (3P) configuration.
- B tripping characteristic.
- 15 kA rated ultimate short-circuit breaking capacity.
- Thermal-magnetic overload and short-circuit protection.
- Supplementary protection according to UL 1077.
- ST200M series interrupting capacity up to 10 kA at 480Y/277 V AC and 125 V DC.
- Trip-free snap-action switching mechanism for dependable operation.
- Compact modular design compatible with DIN rail electrical equipment.
Reliable Circuit Protection for Industrial Equipment
Miniature circuit breakers such as the ABB ST203M-B63 automatically disconnect protected circuits when overload or short-circuit conditions occur. Its thermal-magnetic operating principle combines delayed thermal overload protection with rapid magnetic tripping under high fault currents, helping protect electrical equipment and conductors against damaging overcurrents.
The ST200M series is developed for demanding industrial and OEM applications and features a robust switching mechanism designed for dependable triggering under challenging operating conditions. Its modular profile is compatible with other DIN rail components, helping simplify the design and assembly of electrical control panels and machinery protection systems.
Typical Applications
- Industrial control panels and electrical enclosures.
- Machinery and OEM electrical systems.
- Three-phase industrial control circuits.
- Automation and manufacturing equipment.
- Resistive loads and circuits with relatively low inrush currents.
- Power supplies and equipment requiring UL 1077 supplementary protection.
Technical Specifications
Tick the specs you need, then view products that match.
| Certification | UL 1077 | |
|---|---|---|
| Series | ST200M | |
| ABB order code | 2CDS273334R0635 | |
| Product type | Miniature circuit breaker / supplementary protector | |
| Product group | UL489 / UL1077 MCB | |
| Rated current | 63 A | |
| Number of poles | 3 | |
| Tripping characteristic | B | |
| Protection type | Thermal-magnetic overload and short-circuit protection | |
| Ultimate short-circuit breaking capacity | 15 kA | |
| UL standard | UL 1077 | |
| ST200M UL 1077 interrupting capacity | up to 10 kA at 480Y/277 V AC and 125 V DC | |
| Mounting type | DIN rail mounting | |
| Width | 52.5 mm | |
| Weight | 0.345 kg | |
| EAN | 4016779025263 |
Frequently Asked Questions
What is the ABB ST203M-B63 used for?
The ABB ST203M-B63 is a three-pole miniature circuit breaker designed to provide supplementary overload and short-circuit protection for industrial machinery, control panels and electrical equipment.
What is the current rating of the ST203M-B63?
The ST203M-B63 has a rated current of 63 A and uses a B tripping characteristic.
What is the breaking capacity of the ABB ST203M-B63?
The ST203M-B63 is specified with a 15 kA ultimate short-circuit breaking capacity. The ST200M series also provides UL 1077 supplementary protection with interrupting capacity of up to 10 kA at 480Y/277 V AC and 125 V DC.
What does the B tripping characteristic mean?
A B-curve MCB provides rapid magnetic tripping at relatively low multiples of its rated current, making it suitable for circuits with low or moderate inrush currents, including many resistive loads and control circuits.
How is the ABB ST203M-B63 installed?
The ST203M-B63 has a compact modular format designed for DIN rail mounting inside industrial control panels, machinery enclosures and electrical equipment.
Trusted Industrial Circuit Protection from ABB
ABB ST200M miniature circuit breakers provide compact and dependable supplementary circuit protection for industrial machinery, automation equipment and electrical control systems, combining thermal-magnetic protection with a robust modular design for demanding applications.
