2CDH781010R0632 ABB S751DR-E63 MCB 25kA 1P Type E 63A Selective

Why Choose the ABB S751DR-E63 Selective Main Circuit Breaker?

The ABB S751DR-E63 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 a 63 A rated current and Type E selective tripping characteristic, the S751DR-E63 is engineered for coordinated protection in selective distribution systems. ABB specifies total selectivity to suitable downstream miniature circuit breakers and high selectivity to upstream protective devices through the S750 DR series' current-limiting selective operating principle.

The S751DR-E63 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 compact single-pole format, it provides robust selective main circuit protection for demanding low-voltage distribution systems.

Key Advantages

• Selective 1-pole main circuit breaker for low-voltage distribution systems.
• 63 A rated current with Type E selective tripping 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 supports dependable protective operation without a control circuit.
• Current-limiting selectivity helps minimise unnecessary interruption to unaffected circuits.
• DIN rail mounting supports straightforward integration into electrical distribution equipment.

Key Features

• ABB S750 DR / S751DR selective main circuit breaker series.
• 1-pole configuration.
• 63 A rated current.
• Type E selective tripping 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.
• Suitable for isolation.
• Red ON / green OFF contact-position indication.
• Screw-terminal connections.
• 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 combines a current-limiting selective protection concept with voltage-independent operation, making it particularly suitable for energy distribution systems where continuity of service is an important design requirement.

With its 63 A rating, Type E selective characteristic and 25 kA Icu at 230 V AC, the S751DR-E63 combines selective coordination with substantial short-circuit interruption capability. Its single-pole DIN rail construction makes it suitable for appropriately engineered low-voltage distribution systems where dependable coordination between main and downstream protective devices is 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.