2CDH781010R0627 ABB S751DR-K80 MCB 25kA 1P Type K 80A Selective

Why Choose the ABB S751DR-K80 Selective Main Circuit Breaker?

The ABB S751DR-K80 is a selective 1-pole main circuit breaker (SMCB) designed to provide dependable overload and short-circuit protection in low-voltage electrical distribution systems where selectivity and continuity of supply are important. Part of the ABB S750 DR series, it uses a voltage-independent operating principle and is designed for DIN rail installation.

Featuring an 80 A rated current and Type K selective characteristic, the S751DR-K80 is designed to provide total selectivity with suitable downstream miniature circuit breakers and high selectivity with upstream protective devices. Its current-limiting selective operating principle helps isolate faults at the appropriate protection level, reducing unnecessary interruption to unaffected circuits.

The S751DR-K80 provides an ultimate short-circuit breaking capacity (Icu) of 25 kA at 230 V AC and a service short-circuit breaking capacity (Ics) of 12.5 kA at 230 V AC. With screw terminals, clear red ON / green OFF contact-position indication and a robust single-pole format, it provides high-performance main circuit protection for selective low-voltage distribution systems.

Key Advantages

• Selective 1-pole main circuit breaker for low-voltage distribution systems.
• 80 A rated current with Type K selective characteristic.
• 25 kA Icu at 230 V AC for demanding short-circuit protection.
• 12.5 kA Ics at 230 V AC service short-circuit breaking capacity.
• Designed for total selectivity with suitable downstream miniature circuit breakers.
• Voltage-independent operating principle does not require a control circuit for protective operation.
• Current-limiting selectivity helps maintain supply to unaffected parts of the installation.
• DIN rail mounting supports straightforward integration into electrical distribution equipment.

Key Features

• ABB S750 DR / S751DR selective main circuit breaker series.
• 1-pole configuration.
• 80 A rated current.
• Type K selective characteristic.
• 25 kA ultimate short-circuit breaking capacity (Icu) at 230 V AC.
• 12.5 kA service short-circuit breaking capacity (Ics) at 230 V AC.
• Voltage-independent operating principle.
• Current-limiting selective protection concept.
• Red ON / green OFF contact-position indication.
• Screw-terminal connections.
• DIN rail mounting.
• Designed in accordance with IEC/EN 60947-2.

Selective Main Circuit Protection and Continuity of Supply

Selective main circuit breakers are designed to coordinate with other protective devices so that a downstream fault can be disconnected as close as possible to its source without unnecessarily interrupting unaffected sections of the electrical installation. The ABB S750 DR series uses a current-limiting selective operating principle and voltage-independent operation, making it particularly suitable for distribution systems with demanding continuity-of-service requirements.

With its 80 A rating, Type K selective characteristic and 25 kA Icu at 230 V AC, the S751DR-K80 combines selective protection with substantial short-circuit interruption capability. Its single-pole DIN rail construction makes it suitable for appropriately engineered low-voltage distribution systems where coordinated protection between main and downstream circuit breakers is required.

Typical Applications

• Selective low-voltage power distribution systems.
• Main circuit protection in electrical distribution boards.
• Group and upstream protection in appropriately coordinated installations.
• Installations requiring selectivity with downstream MCBs.
• Commercial and industrial electrical distribution.
• Systems with demanding continuity-of-supply requirements.
• DIN rail distribution assemblies.
• Single-pole circuits requiring selective main protection.