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.
2CDH781010R0487 ABB S751DR-K20 MCB 25kA 1P Type K 20A Selective
ABB S751DR-K20 is a 20 A Type K 1-pole selective main circuit breaker with a 25 kA short-circuit breaking capacity for coordinated low-voltage distribution protection.
£63.39
Why Choose the ABB S751DR-K20 Selective Main Circuit Breaker?
The ABB S751DR-K20 is a selective 1-pole main circuit breaker designed to provide dependable overload and short-circuit protection in low-voltage electrical distribution systems where selective coordination and continuity of supply are important. Part of the ABB S750 DR range, it combines high short-circuit interruption capability with a compact DIN rail format.
Featuring a 20 A rated current and Type K selective characteristic, the S751DR-K20 is designed for coordinated protection with suitable downstream protective devices. Its selective operating principle helps ensure that faults are disconnected by the protective device closest to the affected circuit where appropriate, reducing unnecessary interruption to unaffected parts of the installation.
The S751DR-K20 provides a high 25 kA short-circuit breaking capacity and uses a voltage-independent operating principle. Its single-pole configuration, selective protection characteristics and robust construction make it suitable for appropriately engineered commercial, industrial and building distribution systems requiring reliable main circuit protection.
Key Advantages
- Selective 1-pole main circuit breaker for low-voltage distribution systems.
- 20 A rated current with Type K selective characteristic.
- 25 kA short-circuit breaking capacity for demanding fault-current conditions.
- Designed for selective coordination with suitable downstream protective devices.
- Voltage-independent operating principle supports dependable protection without an auxiliary supply.
- Current-limiting operation helps reduce the effects of short-circuit faults.
- Selective protection can help maintain supply to unaffected circuits.
- DIN rail mounting supports straightforward installation in distribution equipment.
Key Features
- ABB S750 DR / S751DR selective main circuit breaker series.
- 1-pole configuration.
- 20 A rated current.
- Type K selective characteristic.
- 25 kA short-circuit breaking capacity.
- Voltage-independent operating principle.
- Selective coordination for appropriately designed distribution systems.
- Current-limiting circuit protection.
- Overload and short-circuit protection.
- Clear contact-position indication.
- Robust terminal connections for distribution applications.
- DIN rail mounting for electrical distribution assemblies.
Selective Main Circuit Protection and Continuity of Supply
Selective circuit protection is designed to coordinate protective devices so that a fault is disconnected as close as possible to its source. In an appropriately designed installation, this can prevent an upstream main protective device from unnecessarily disconnecting unaffected downstream circuits, helping improve continuity of supply and simplify fault isolation.
With its 20 A rating, Type K selective characteristic and 25 kA short-circuit breaking capacity, the ABB S751DR-K20 provides robust selective protection for suitable low-voltage distribution systems. Its voltage-independent operating principle and single-pole DIN rail construction make it suitable for installations where coordinated protection and dependable operation are required.
Typical Applications
- Selective low-voltage power distribution systems.
- Main circuit protection in electrical distribution boards.
- Installations requiring coordination with downstream MCBs.
- Commercial electrical distribution systems.
- Industrial electrical distribution systems.
- Building services distribution equipment.
- Systems where continuity of supply is important.
- Single-pole circuits requiring selective main protection.
Technical Specifications
| Product group | S800 / S800P / S750 MCB |
|---|---|
| Series | S750 DR / S751DR |
| Order code | 2CDH781010R0487 |
| Product type | Selective main circuit breaker |
| Number of poles | 1P |
| Rated current | 20 A |
| Tripping characteristic | Type K selective |
| Short-circuit breaking capacity | 25 kA |
| Operating principle | Voltage-independent |
| Protection function | Overload and short-circuit protection |
| Mounting type | DIN rail |
Frequently Asked Questions
What is the ABB S751DR-K20 used for?
The ABB S751DR-K20 is a 1-pole selective main circuit breaker used for overload and short-circuit protection in low-voltage distribution systems where selective coordination with other protective devices is required.
What is the current rating of the ABB S751DR-K20?
The S751DR-K20 has a rated current of 20 A and uses a Type K selective characteristic.
What is the breaking capacity of the S751DR-K20?
The ABB S751DR-K20 provides a high 25 kA short-circuit breaking capacity for demanding low-voltage circuit protection applications.
What does selective operation mean on the ABB S751DR-K20?
Selective operation allows appropriately coordinated protective devices to isolate a fault at the closest suitable protection level, helping minimise unnecessary interruption to unaffected parts of the electrical installation.
Is the ABB S751DR-K20 voltage-independent?
Yes. The S751DR-K20 uses a voltage-independent operating principle, supporting dependable protective operation without relying on an auxiliary electrical supply.
Trusted Selective Circuit Protection from ABB
ABB S750 DR selective main circuit breakers provide robust overload and short-circuit protection for low-voltage distribution systems where selective coordination, high breaking capacity and continuity of supply are important design considerations.
