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2CDH783010R0202 ABB S753DR-E20 Selective Main Circuit-Breaker 20 A 3P 25 kA
ABB S753DR-E20 is a 20 A three-pole E-characteristic selective main circuit-breaker with 25 kA ultimate short-circuit breaking capacity at 400 V AC for electrical distribution protection.
£236.55
Why Choose the ABB S753DR-E20 Selective Main Circuit-Breaker?
The ABB S753DR-E20 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 designed to provide effective selectivity with downstream miniature circuit-breakers.
With its selective operating characteristics and high short-circuit breaking capacity, the S753DR-E20 is particularly suited to main distribution applications in residential, commercial and industrial installations. Its current-limiting selectivity helps downstream protective devices clear local faults without unnecessarily disconnecting the entire installation, supporting improved system availability.
The S753DR-E20 has a rated current of 20 A, E selective tripping characteristic and three-pole configuration. 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, making it suitable for demanding electrical distribution applications.
Key Advantages
- Selective main circuit-breaker designed for high-availability distribution systems.
- 20 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.
- Designed to provide total selectivity with downstream MCBs.
- DIN rail mounting simplifies installation within distribution boards and electrical enclosures.
Key Features
- ABB S750 DR selective main circuit-breaker series.
- 20 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 are designed to coordinate with downstream protective devices so that a fault can be isolated as close as possible to its source. The ABB S753DR-E20 provides current-limiting selectivity, helping downstream MCBs disconnect affected branch circuits while maintaining power to unaffected parts of the installation.
The S750 DR series operates independently of the supply voltage and does not require a separate control circuit to open or close its contacts. Combined with its high short-circuit capacity and selective operating characteristics, this makes the S753DR-E20 well suited to electrical distribution systems where dependable protection and continuity of service are priorities.
Typical Applications
- Main electrical distribution boards.
- Residential and multi-occupancy electrical installations.
- Commercial building distribution systems.
- Industrial electrical distribution.
- Three-phase feeder and main circuit protection.
- Installations requiring selective coordination with downstream MCBs.
Technical Specifications
| Series | S750 DR |
|---|---|
| Order code | 2CDH783010R0202 |
| Product type | Selective main circuit-breaker (SMCB) |
| Number of poles | 3 |
| Rated current | 20 A |
| Tripping characteristic | E (selective) |
| Rated operational voltage | 400 V AC |
| Rated frequency | 50 / 60 Hz |
| Rated ultimate short-circuit breaking capacity (Icu) | 25 kA at 400 V AC |
| Rated service short-circuit breaking capacity (Ics) | 12.5 kA at 400 V AC |
| Rated insulation voltage (Ui) | 690 V |
| Rated impulse withstand voltage (Uimp) | 6 kV |
| Protection rating | IP20 / IP40 depending on installation |
| Pollution degree | 3 |
| Power loss | 5.4 W per pole at rated operating conditions |
| Operating temperature | -25 to +55 °C |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
| Tightening torque | 2.5–3 N·m |
| Dimensions (H × W × D) | 130 × 81 × 96 mm |
| Weight | approx. 1.05 kg |
| Standard | IEC/EN 60947-2 |
Frequently Asked Questions
What is the ABB S753DR-E20 used for?
The ABB S753DR-E20 is a three-pole selective main circuit-breaker used for overcurrent and short-circuit protection in electrical distribution systems where selective coordination and continuity of supply are important.
What is the rated current of the S753DR-E20?
The S753DR-E20 has a rated current of 20 A and uses an E selective tripping characteristic.
What is the breaking capacity of the ABB S753DR-E20?
The circuit-breaker has a rated ultimate short-circuit breaking capacity of 25 kA at 400 V AC and a rated service short-circuit breaking capacity of 12.5 kA at 400 V AC.
How many poles does the S753DR-E20 have?
The S753DR-E20 is a three-pole selective main circuit-breaker designed for three-phase electrical distribution applications.
How is the ABB S753DR-E20 installed?
The S753DR-E20 is designed for DIN rail mounting in electrical distribution boards and enclosures and uses screw terminals for electrical connections.
Trusted ABB Circuit Protection
ABB S750 DR selective main circuit-breakers are designed for dependable protection and selective coordination in electrical distribution systems, combining high short-circuit performance with a voltage-independent operating principle for applications where continuity of service is important.
