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1SDA055732R1 ABB E1N 1250 PR122/P-LSI 1250A 3P Fixed Air Circuit Breaker
ABB 1SDA055732R1 E1N 1250 three-pole fixed air circuit breaker rated at 1250 A with a PR122/P-LSI electronic overcurrent release, horizontal rear terminals and 50 kA short-circuit breaking capacity.
£8,091.60
Why Choose the ABB E1N 1250 PR122/P-LSI 1250A 3P Fixed Air Circuit Breaker?
The ABB E1N 1250 PR122/P-LSI, order code 1SDA055732R1, 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 ABB SACE Emax E1 series, it combines a 1250 A rated current with the advanced PR122/P-LSI electronic overcurrent release for reliable overload and short-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 breaker position indication for signalling and control applications.
With a rated operational voltage of 690 V AC, the E1N 1250 provides a rated ultimate and service short-circuit breaking capacity of 50 kA throughout its specified 220–690 V AC range. The PR122/P-LSI electronic release provides long-time, short-time and instantaneous protection functions, supporting effective 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-LSI electronic protection release provides long-time, short-time and instantaneous protection.
- 50 kA ultimate and service short-circuit breaking capacity across the specified AC voltage range.
- Fixed construction with horizontal rear terminals for switchboard integration.
- Four auxiliary contacts provide breaker open/closed position indication.
Key Features
- ABB SACE Emax E1N series.
- 1250 A rated uninterrupted current.
- 3-pole air circuit breaker.
- PR122/P-LSI electronic overcurrent release.
- Long-time (L), short-time (S) and instantaneous (I) protection functions.
- 690 V AC rated operational voltage.
- 50 kA rated ultimate short-circuit breaking capacity.
- 50 kA rated service short-circuit breaking capacity.
- 50 kA short-time withstand current for 1 s.
- Fixed mounting with horizontal rear flat 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 overload and short-circuit currents.
The PR122/P-LSI release combines long-time overload protection with short-time selective and instantaneous short-circuit protection. This combination supports effective discrimination between protective 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 selective high-current circuit protection.
Technical Specifications
| Series | SACE Emax E1 |
|---|---|
| ABB order code | 1SDA055732R1 |
| Product group | 310513-New Emax |
| Product type | Air circuit breaker (ACB) |
| Performance level | N |
| Rated current (In) | 1250 A |
| Rated operational current (Ie) | 1250 A |
| Rated uninterrupted current (Iu) | 1250 A |
| Number of poles | 3 |
| Current type | AC |
| Rated operational voltage | 690 V AC |
| Rated insulation voltage (Ui) | 1000 V |
| Rated impulse withstand voltage (Uimp) | 12 kV |
| Rated ultimate short-circuit breaking capacity (Icu) | 50 kA at 220–690 V AC |
| Rated service short-circuit breaking capacity (Ics) | 50 kA at 220–690 V AC |
| Rated short-time withstand current (Icw) | 50 kA for 1 s; 36 kA for 3 s |
| Protection release | PR122/P-LSI R1250 |
| Release type | Electronic |
| Protection functions | Long-time (L), short-time (S) and instantaneous (I) |
| Overload release setting range | 400–1250 A |
| Short-time short-circuit release setting range | 750–12500 A |
| Instantaneous short-circuit release setting range | 1875–18750 A |
| Mounting type | Fixed |
| Terminal connection | Horizontal rear flat terminals |
| Auxiliary contacts | 4 for open/closed position indication |
| Protection rating | IP20 |
| Power loss | 150 W |
| Mechanical durability | 25,000 operating cycles |
| Electrical durability | 10,000 cycles at ≤440 V; 8,000 cycles at 500–690 V |
| Weight | 50 kg |
| Standard | IEC |
Frequently Asked Questions
What is the ABB 1SDA055732R1?
The ABB 1SDA055732R1 is an E1N 1250 three-pole fixed SACE Emax air circuit breaker rated at 1250 A and equipped with a PR122/P-LSI R1250 electronic overcurrent release.
What protection functions does the PR122/P-LSI provide?
The PR122/P-LSI electronic release provides long-time overload (L), short-time short-circuit (S) and instantaneous short-circuit (I) protection.
What is the breaking capacity of the ABB E1N 1250?
The E1N 1250 provides a rated ultimate short-circuit breaking capacity (Icu) and rated service short-circuit breaking capacity (Ics) of 50 kA throughout its specified 220–690 V AC range.
Is the ABB 1SDA055732R1 fixed or withdrawable?
The 1SDA055732R1 is a fixed three-pole air circuit breaker supplied with horizontal rear flat terminals for integration into low-voltage switchboards.
What is the rated voltage of the ABB E1N 1250?
The circuit breaker has a rated operational voltage of 690 V AC, with a rated insulation voltage of 1000 V and a rated impulse withstand voltage of 12 kV.
Trusted Low-Voltage Protection from ABB
ABB SACE Emax air circuit breakers are widely used in demanding low-voltage distribution systems, combining high short-circuit performance, advanced electronic protection and robust construction for dependable industrial power control.
