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2CCS861002R1647 ABB S801S-UCK125-R MCB 50 kA 1P Type K 125 A
ABB S801S-UCK125-R is a 125 A single-pole UC-K miniature circuit breaker with 50 kA ultimate short-circuit breaking capacity for high-performance DC circuit protection.
£131.24
Why Choose the ABB S801S-UCK125-R MCB?
The ABB S801S-UCK125-R is a high-performance single-pole miniature circuit breaker (MCB) designed to protect electrical circuits against overloads and short circuits where high breaking capacity is required. As part of the ABB System pro M compact S800S series, this breaker combines a 125 A rated current, UC-K tripping characteristic and 50 kA ultimate short-circuit breaking capacity for demanding commercial, industrial and DC applications.
The S801S-UCK125-R is particularly suitable for circuits supplying motors, transformers and auxiliary equipment. Its K-type characteristic is designed to tolerate functional peak currents while providing effective overcurrent protection for cables and connected equipment, helping reduce unwanted tripping in applications with elevated starting currents.
This one-pole breaker is rated for operation at up to 250 V DC in accordance with IEC/EN 60947-2 and provides an ultimate short-circuit breaking capacity of 50 kA at 250 V DC. The -R version is intended for ring-terminal connections, making it well suited to robust electrical installations including rolling-stock, machinery and industrial distribution systems.
Key Advantages
- High-performance 125 A single-pole miniature circuit breaker.
- 50 kA ultimate short-circuit breaking capacity for demanding installations.
- UC-K tripping characteristic suited to circuits with functional peak and starting currents.
- Designed for protection against both overloads and short circuits.
- Suitable for motors, transformers, auxiliary circuits and industrial distribution.
- Ring-terminal connection version for secure electrical connections.
- Compact S800S construction suitable for space-conscious control and distribution assemblies.
Key Features
- ABB System pro M compact S800S series.
- 125 A rated current.
- 1-pole configuration with one protected pole.
- UC-K / K-type tripping characteristic.
- 50 kA Icu at 250 V DC.
- 20 kA Ics at 250 V DC.
- 250 V DC rated operational voltage.
- 1,500 V rated insulation voltage.
- 8 kV rated impulse withstand voltage.
- ON / OFF / TRIP contact-position indication.
- IP20 protection rating.
- Compliant with IEC/EN 60947-2.
High-Performance Circuit Protection
The ABB S800S range is engineered for installations where conventional circuit breakers may not provide sufficient short-circuit performance. The S801S-UCK125-R combines thermal overload protection with magnetic short-circuit protection, helping safeguard cables, equipment and electrical distribution systems under demanding operating conditions.
Its UC-K characteristic makes the breaker particularly useful for circuits that experience temporary peak currents during normal operation. This makes it suitable for industrial loads such as motors and transformers while retaining dependable protection against damaging sustained overcurrents and short circuits.
Typical Applications
- Industrial DC distribution circuits.
- Motor and machinery circuits.
- Transformer protection and auxiliary circuits.
- Industrial control and automation panels.
- High short-circuit-current installations.
- Rolling-stock and transportation electrical systems.
- Commercial and industrial electrical distribution.
Technical Specifications
| Series | System pro M compact S800S |
|---|---|
| ABB order code | 2CCS861002R1647 |
| Product type | High-performance miniature circuit breaker (MCB) |
| Number of poles | 1 |
| Protected poles | 1 |
| Rated current | 125 A |
| Tripping characteristic | UC-K / K |
| Rated operational voltage | 250 V DC |
| Ultimate short-circuit breaking capacity (Icu) | 50 kA at 250 V DC |
| Service short-circuit breaking capacity (Ics) | 20 kA at 250 V DC |
| Rated insulation voltage (Ui) | 1,500 V |
| Rated impulse withstand voltage (Uimp) | 8 kV |
| Protection rating | IP20 |
| Standard | IEC/EN 60947-2 |
| Operating temperature | -25 to +60 °C |
| Power loss | 9.4 W per pole at rated operating conditions |
| Dimensions (H × W × D) | 95 × 27 × 82.5 mm |
| Weight | 0.245 kg |
| Connection type | Ring-terminal connection |
Frequently Asked Questions
What is the ABB S801S-UCK125-R used for?
The S801S-UCK125-R is used to protect electrical circuits, including motors, transformers and auxiliary circuits, against overloads and short circuits in applications requiring high breaking capacity.
What is the rated current of the S801S-UCK125-R?
The breaker has a rated current of 125 A and a single protected pole.
What is the breaking capacity of this circuit breaker?
The S801S-UCK125-R has an ultimate short-circuit breaking capacity of 50 kA at 250 V DC and a service breaking capacity of 20 kA at 250 V DC.
What does the K characteristic provide?
The UC-K / K-type characteristic is designed to accommodate functional peak currents while providing effective overload and short-circuit protection, making it suitable for loads such as motors and transformers.
Which standard does the ABB S801S-UCK125-R comply with?
The S801S-UCK125-R is designed in accordance with IEC/EN 60947-2 for circuit breakers used in commercial and industrial applications.
Trusted ABB Circuit Protection
ABB System pro M compact S800S high-performance circuit breakers provide dependable overload and short-circuit protection for demanding commercial and industrial electrical systems where high breaking capacity, compact construction and reliable operation are required.
