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1SDA055961R1 ABB E2S1250 4P PR121 F 1250 A Air Circuit Breaker
ABB 1SDA055961R1 E2S1250 four-pole fixed air circuit breaker with a 1250 A rating and PR121/P-LSI electronic overcurrent release for low-voltage power distribution protection.
£10,682.90
Why Choose the ABB E2S1250 4P PR121 F Air Circuit Breaker?
The ABB E2S1250 4P PR121 F, order code 1SDA055961R1, is a high-performance four-pole fixed air circuit breaker (ACB) designed for protection and switching in low-voltage power distribution systems. As part of the ABB SACE Emax E2 series, this breaker combines a 1250 A current rating with the electronic PR121/P-LSI overcurrent release for dependable protection of industrial electrical installations.
The E2S1250 uses ABB's electronic PR121/P-LSI trip unit to provide long-time, short-time and instantaneous overcurrent protection. These LSI protection functions enable the circuit breaker to respond to overload and short-circuit conditions while supporting selective coordination within low-voltage distribution networks.
With a rated uninterrupted current of 1250 A, four-pole construction and a rated operational voltage up to 690 V AC, the E2S1250 is suited to demanding switchboards, distribution panels and industrial power systems. This version is a fixed circuit breaker with rear horizontal terminals, providing a robust installation arrangement for high-current switchgear assemblies.
Key Advantages
- High-performance ABB SACE Emax air circuit breaker for low-voltage distribution.
- 1250 A rated uninterrupted current for high-current industrial systems.
- Four-pole configuration for switching and protection of multi-conductor systems.
- Electronic PR121/P-LSI trip unit provides long-time, short-time and instantaneous protection.
- Rated operational voltage up to 690 V AC.
- 85 kA breaking capacity at 400/415 V AC for demanding fault-protection applications.
- Fixed construction with rear horizontal terminals for switchboard integration.
Key Features
- ABB SACE Emax E2S series.
- 1250 A rated current.
- Four-pole air circuit breaker.
- PR121/P-LSI electronic overcurrent release.
- LSI protection functions for overload and short-circuit protection.
- 690 V AC rated operational voltage.
- 1000 V rated insulation voltage.
- 12 kV rated impulse withstand voltage.
- Fixed installation with rear horizontal terminal arrangement.
- Supplied with auxiliary contacts and circuit-breaker open/closed position indication.
Reliable Protection for Low-Voltage Power Distribution
Air circuit breakers such as the ABB SACE Emax E2S1250 protect high-current electrical distribution systems against overloads and short circuits while also providing controlled switching and isolation. Their high breaking capacity makes them particularly suitable for main distribution boards and industrial installations where substantial prospective fault currents can occur.
The PR121/P-LSI electronic release monitors current and provides adjustable protection functions for long-time overload, short-time fault and instantaneous short-circuit conditions. Combined with the Emax breaker's robust fixed construction and high short-circuit performance, this provides dependable protection and coordination for critical low-voltage distribution equipment.
Typical Applications
- Main low-voltage electrical distribution switchboards.
- Industrial power distribution systems.
- Manufacturing and process plant switchgear.
- Commercial and infrastructure distribution boards.
- Generator and transformer distribution systems.
- High-current feeder protection and isolation.
Technical Specifications
| Series | SACE Emax E2 |
|---|---|
| ABB order code | 1SDA055961R1 |
| Product type | Air circuit breaker |
| Number of poles | 4 |
| Rated uninterrupted current (Iu) | 1250 A |
| Rated operational current (Ie) | 1250 A |
| Rated operational voltage | 690 V AC |
| Rated insulation voltage (Ui) | 1000 V |
| Rated impulse withstand voltage (Uimp) | 12 kV |
| Trip unit | PR121/P-LSI |
| Release type | Electronic |
| Protection functions | LSI – Long-time, Short-time and Instantaneous |
| Ultimate short-circuit breaking capacity (Icu) at 400/415 V AC | 85 kA |
| Service short-circuit breaking capacity (Ics) at 400/415 V AC | 85 kA |
| Ultimate short-circuit breaking capacity (Icu) at 690 V AC | 65 kA |
| Rated short-time withstand current (Icw), 1 s | 65 kA |
| Rated short-time withstand current (Icw), 3 s | 50 kA |
| Performance level | S |
| Installation | Fixed |
| Terminal arrangement | Rear horizontal |
| Standard | IEC |
Frequently Asked Questions
What is the ABB E2S1250 4P PR121 F used for?
The ABB E2S1250 is an air circuit breaker designed for switching and protecting high-current low-voltage electrical distribution systems against overload and short-circuit conditions.
What is the rated current of ABB 1SDA055961R1?
The ABB 1SDA055961R1 has a rated uninterrupted current of 1250 A and is configured as a four-pole circuit breaker.
Which trip unit is fitted to this E2S1250 circuit breaker?
This version is fitted with the ABB PR121/P-LSI electronic overcurrent release, providing long-time, short-time and instantaneous protection functions.
What is the breaking capacity of the E2S1250?
The E2S1250 S-performance breaker has an ultimate short-circuit breaking capacity of 85 kA at 400/415 V AC and 65 kA at 690 V AC.
Is ABB 1SDA055961R1 a fixed or withdrawable circuit breaker?
ABB order code 1SDA055961R1 is a fixed four-pole air circuit breaker with rear horizontal terminals.
Trusted Protection for Industrial Power Systems
ABB SACE Emax air circuit breakers are engineered for dependable switching, isolation and overcurrent protection in demanding low-voltage power distribution systems, combining high breaking performance with electronic protection technology.
