2CDH782010R0487 ABB S752DR-K20 MCB 25kA 2P Type K 20A Selective

Why Choose the ABB S752DR-K20 Selective Main Circuit Breaker?

The ABB S752DR-K20 is a selective 2-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 combines selective protection with voltage-independent operation and DIN rail mounting.

Featuring a 20 A rated current and Type K selective characteristic, the S752DR-K20 is designed for coordinated protection with suitable downstream miniature circuit breakers. The S750 DR operating principle provides total short-circuit selectivity to downstream MCBs and high selectivity to upstream protective devices, helping isolate faults at the appropriate protection level while maintaining supply to unaffected circuits.

The S752DR-K20 provides an ultimate short-circuit breaking capacity (Icu) of 25 kA at 400 V AC and a service short-circuit breaking capacity (Ics) of 12.5 kA at 400 V AC. Its two-pole construction, screw terminals and clear red ON / green OFF contact-position indication provide a robust solution for selective commercial, industrial and building distribution systems.

Key Advantages

• Selective 2-pole main circuit breaker for low-voltage distribution systems.
• 20 A rated current with Type K selective characteristic.
• 25 kA Icu at 400 V AC for demanding short-circuit protection.
• 12.5 kA Ics at 400 V AC service short-circuit breaking capacity.
• Provides total short-circuit selectivity to suitable downstream miniature circuit breakers.
• Voltage-independent operating principle supports dependable protective operation.
• Current-limiting selective operation helps minimise unnecessary interruption to unaffected circuits.
• DIN rail mounting supports straightforward integration into electrical distribution equipment.

Key Features

• ABB S750 DR / S752DR selective main circuit breaker series.
• 2-pole configuration.
• 20 A rated current.
• Type K selective characteristic.
• 25 kA ultimate short-circuit breaking capacity (Icu) at 400 V AC.
• 12.5 kA service short-circuit breaking capacity (Ics) at 400 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 downstream protective devices so that a 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, supporting dependable group protection and continuity of supply in appropriately coordinated distribution systems.

With its 20 A rating, Type K selective characteristic, 25 kA Icu at 400 V AC and two-pole construction, the S752DR-K20 provides robust selective protection for demanding low-voltage distribution systems. Its DIN rail format and screw-terminal connections make it suitable for commercial, industrial and building installations requiring coordinated main and downstream circuit protection.

Typical Applications

• Selective low-voltage power distribution systems.
• Main and group circuit protection in electrical distribution boards.
• Installations requiring selectivity with downstream MCBs.
• Commercial electrical distribution systems.
• Industrial electrical distribution systems.
• Building services and meter-board applications.
• Systems where continuity of supply is important.
• Two-pole circuits requiring selective main protection.