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1SDA055733R1 ABB E1N 1250 PR122/P-LSIG 1250A 3P Fixed Air Circuit Breaker
ABB 1SDA055733R1 E1N 1250 three-pole fixed air circuit breaker rated at 1250 A with a PR122/P-LSIG R1250 electronic release, integrated earth-fault protection, horizontal rear terminals and 50 kA breaking capacity at 415 V AC.
£9,034.60
Why Choose the ABB E1N 1250 PR122/P-LSIG 1250A 3P Fixed Air Circuit Breaker?
The ABB E1N 1250 PR122/P-LSIG, order code 1SDA055733R1, is a high-performance three-pole fixed air circuit breaker (ACB) designed for protection and switching in demanding low-voltage electrical distribution systems. As part of the established ABB SACE Emax E1N series, it combines a 1250 A rated current with the advanced PR122/P-LSIG electronic overcurrent release for comprehensive circuit protection.
This E1N breaker is supplied in a fixed configuration with horizontal rear terminals, making it suitable for integration into industrial switchboards, main distribution boards and power-control assemblies. The three-pole design is intended for three-phase circuits, while four auxiliary contacts provide open and closed circuit-breaker position indication for signalling and control applications.
With a rated operational voltage of 690 V AC, the E1N platform provides a 50 kA rated ultimate short-circuit breaking capacity at 415 V AC, together with a 50 kA rated service short-circuit breaking capacity. The PR122/P-LSIG electronic release provides long-time, short-time, instantaneous and earth-fault protection functions, supporting advanced protection coordination and selectivity in industrial power networks.
Key Advantages
- Heavy-duty ABB SACE Emax air circuit breaker for low-voltage power distribution.
- 1250 A rated current for high-current industrial and commercial installations.
- Three-pole configuration for three-phase distribution systems.
- PR122/P-LSIG electronic protection release provides overload, short-time, instantaneous and earth-fault protection.
- 50 kA ultimate and service short-circuit breaking capacity at 415 V AC.
- Fixed construction with horizontal rear terminals for switchboard integration.
- Four auxiliary contacts provide circuit-breaker open/closed position indication.
Key Features
- ABB SACE Emax E1N series.
- 1250 A rated uninterrupted current.
- 3-pole air circuit breaker.
- PR122/P-LSIG R1250 electronic overcurrent release.
- Long-time (L), short-time (S), instantaneous (I) and earth-fault (G) protection functions.
- 690 V AC rated operational voltage.
- 50 kA rated ultimate short-circuit breaking capacity at 415 V AC.
- 50 kA rated service short-circuit breaking capacity at 415 V AC.
- 50 kA rated short-time withstand current for 1 s.
- Fixed mounting with horizontal rear terminals.
Advanced Protection for Low-Voltage Distribution Systems
Air circuit breakers such as the ABB E1N 1250 provide switching and automatic protection for high-current low-voltage circuits. The electronic trip unit monitors current conditions and commands the breaker to interrupt the circuit when configured protection thresholds are exceeded, helping protect cables, switchgear and connected equipment against damaging overloads, short circuits and earth faults.
The PR122/P-LSIG release combines long-time overload protection with short-time selective, instantaneous short-circuit and earth-fault protection. This combination supports effective discrimination and protection coordination between devices, while the robust E1N platform provides the interruption capability required for demanding industrial and commercial power distribution systems.
Typical Applications
- Low-voltage main distribution switchboards.
- Industrial power distribution systems.
- Main incomer and feeder circuit protection.
- Manufacturing and process plants.
- Commercial and infrastructure electrical installations.
- Generator and transformer distribution systems.
- Fixed switchgear requiring advanced overcurrent and earth-fault protection.
Technical Specifications
| Series | SACE Emax E1N |
|---|---|
| ABB order code | 1SDA055733R1 |
| Product group | 310513-New Emax |
| EAN | 8015644570736 |
| Product type | Air circuit breaker (ACB) |
| Performance level | E1N |
| Rated current (In) | 1250 A |
| Rated uninterrupted current (Iu) | 1250 A |
| Number of poles | 3 |
| Current type | AC |
| Rated operational voltage (Ue) | 690 V AC |
| Rated ultimate short-circuit breaking capacity (Icu) at 415 V AC | 50 kA |
| Rated service short-circuit breaking capacity (Ics) at 415 V AC | 50 kA |
| Rated short-time withstand current (Icw) | 50 kA for 1 s; 36 kA for 3 s |
| Protection release | PR122/P-LSIG R1250 |
| Release type | Electronic overcurrent release |
| Protection functions | Long-time (L), short-time (S), instantaneous (I) and earth-fault (G) |
| Earth-fault protection | Integrated |
| Mounting type | Fixed |
| Terminal connection | Horizontal rear terminals |
| Auxiliary contacts | 4 for open/closed position indication |
| Weight | 50 kg |
Frequently Asked Questions
What is the ABB 1SDA055733R1?
The ABB 1SDA055733R1 is an E1N 1250 three-pole fixed SACE Emax air circuit breaker rated at 1250 A and equipped with a PR122/P-LSIG R1250 electronic overcurrent release.
What protection functions does the PR122/P-LSIG provide?
The PR122/P-LSIG electronic release provides long-time overload (L), short-time short-circuit (S), instantaneous short-circuit (I) and earth-fault (G) protection.
What is the breaking capacity of the ABB E1N 1250?
The E1N 1250 provides a rated ultimate short-circuit breaking capacity and rated service short-circuit breaking capacity of 50 kA at 415 V AC.
Is the ABB 1SDA055733R1 fixed or withdrawable?
The 1SDA055733R1 is a fixed three-pole air circuit breaker supplied with horizontal rear terminals for integration into low-voltage switchboards.
What is the difference between PR122/P-LSI and PR122/P-LSIG protection?
The PR122/P-LSIG release adds earth-fault protection (G) to the long-time, short-time and instantaneous protection functions provided by an LSI configuration, giving the breaker additional protection against earth-fault currents.
Trusted Low-Voltage Protection from ABB
ABB SACE Emax air circuit breakers are engineered for dependable switching and protection in demanding low-voltage distribution systems, combining high short-circuit performance, advanced electronic protection and robust construction for industrial power control.
