2CDH783010R0252 ABB S753DR-E25 Selective Main Circuit-Breaker 25 A 3P 25 kA

Why Choose the ABB S753DR-E25 Selective Main Circuit-Breaker?

The ABB S753DR-E25 is a high-performance three-pole selective main circuit-breaker (SMCB) designed for reliable overcurrent and short-circuit protection in electrical distribution systems where continuity of supply and selective coordination are important. As part of the ABB S750 DR series, it uses a voltage-independent operating principle and is specifically designed to provide total selectivity with downstream miniature circuit-breakers.

This selective circuit-breaker combines a high short-circuit breaking capacity with current-limiting selectivity, helping localise electrical faults and minimise unnecessary interruption to unaffected circuits. The voltage-independent design means the breaker does not rely on a separate control circuit to make or break its contacts, making it particularly suitable for distribution systems with demanding availability requirements.

With a rated current of 25 A, an E selective tripping characteristic and a three-pole configuration, the S753DR-E25 is designed for three-phase distribution applications. It operates at a rated voltage of 400 V AC and provides a rated ultimate short-circuit breaking capacity of 25 kA at 400 V AC.

Key Advantages

• Selective main circuit-breaker designed for high-availability electrical distribution systems.
• 25 A rated current with E selective tripping characteristic.
• Three-pole protection for three-phase electrical distribution circuits.
• High 25 kA ultimate short-circuit breaking capacity at 400 V AC.
• Voltage-independent operating principle without the need for a separate control circuit.
• Provides total selectivity with downstream MCBs and strong selectivity with upstream protective devices.
• DIN rail mounting simplifies installation within distribution boards and electrical enclosures.

Key Features

• ABB S750 DR selective main circuit-breaker series.
• 25 A rated current.
• Three-pole configuration.
• E selective tripping characteristic.
• 400 V AC rated operational voltage.
• 25 kA rated ultimate short-circuit breaking capacity (Icu) at 400 V AC.
• 12.5 kA rated service short-circuit breaking capacity (Ics) at 400 V AC.
• 690 V rated insulation voltage (Ui).
• 6 kV rated impulse withstand voltage (Uimp).
• Rated frequency of 50 / 60 Hz.
• DIN rail mounting with screw terminals.
• Red ON / green OFF contact position indication.

Reliable Selective Protection for Electrical Distribution

Selective main circuit-breakers such as the ABB S753DR-E25 are designed to coordinate with downstream protective devices so that an electrical fault can be isolated as close as possible to its source. The S750 DR series provides current-limiting selectivity, helping downstream MCBs disconnect affected branch circuits while maintaining the supply to unaffected parts of the electrical installation.

The S753DR-E25 operates independently of the supply voltage and does not require a separate control circuit for contact operation. Combined with its high short-circuit capacity, E selective characteristic and robust DIN rail format, this makes it well suited to distribution systems where dependable protection and continuity of service are key requirements.

Typical Applications

• Main electrical distribution boards.
• Residential and multi-occupancy electrical installations.
• Commercial building distribution systems.
• Industrial electrical distribution systems.
• Three-phase feeder and main circuit protection.
• Installations requiring selective coordination with downstream MCBs.