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1SDA055647R1 ABB E1B 1250 PR123/P-LSIG 1250A 4-Pole Fixed Air Circuit Breaker
ABB 1SDA055647R1 SACE Emax E1B 1250 is a 1250 A four-pole fixed air circuit breaker with horizontal rear terminals, a PR123/P-LSIG R1250 electronic trip unit and 42 kA short-circuit breaking capacity across 220–690 V AC.
£16,285.10
Why Choose the ABB E1B 1250 PR123/P-LSIG 1250A Air Circuit Breaker?
The ABB E1B 1250 PR123/P-LSIG, order code 1SDA055647R1, is a high-performance 1250 A four-pole fixed air circuit breaker designed for protection and switching in low-voltage electrical distribution systems. As part of the established ABB SACE Emax series, it combines robust circuit-breaking performance with the advanced PR123/P-LSIG electronic overcurrent release for comprehensive protection of industrial power networks.
This E1B circuit breaker is supplied in a fixed configuration with horizontal rear flat terminals, providing a robust connection arrangement for permanent installation within compatible low-voltage switchboards and distribution assemblies. The PR123/P-LSIG R1250 electronic trip unit provides long-time, short-time, instantaneous and earth-fault protection functions, helping protect electrical installations against overloads, short circuits and earth faults.
With a rated uninterrupted current of 1250 A, four-pole construction and a rated ultimate short-circuit breaking capacity of 42 kA across 220–690 V AC, the E1B 1250 is engineered for demanding industrial distribution applications. Its four-pole arrangement supports three-phase systems with neutral, while four auxiliary contacts provide open/closed circuit-breaker position indication for switchboard control and monitoring.
Key Advantages
- High-current 1250 A air circuit breaker for low-voltage power distribution.
- Four-pole configuration suitable for three-phase and neutral distribution systems.
- PR123/P-LSIG R1250 electronic trip unit provides advanced electronic circuit protection.
- LSIG protection functions cover overload, short-time short circuit, instantaneous short circuit and earth-fault conditions.
- 42 kA rated ultimate and service short-circuit breaking capacity across the specified 220–690 V AC range.
- 42 kA short-time withstand current for 1 s for demanding distribution applications.
- Fixed construction with horizontal rear flat terminals for permanent switchboard installation.
- Four auxiliary contacts provide circuit-breaker open/closed status signalling.
Key Features
- ABB SACE Emax E1B series.
- 1250 A rated uninterrupted current.
- Four-pole configuration.
- PR123/P-LSIG R1250 electronic overcurrent release.
- Long-time (L) overload protection.
- Short-time (S) short-circuit protection.
- Instantaneous (I) short-circuit protection.
- Earth-fault (G) protection.
- 42 kA Icu and Ics across 220–690 V AC.
- 42 kA Icw for 1 s and 36 kA for 3 s.
- 690 V AC rated operational voltage.
- 1000 V rated insulation voltage.
- 12 kV rated impulse withstand voltage.
- Fixed construction with horizontal rear flat terminals.
Advanced Protection for Low-Voltage Distribution Systems
Air circuit breakers such as the ABB SACE Emax E1B protect high-current electrical distribution systems by interrupting abnormal current conditions before cables, switchgear and connected equipment can be damaged. The E1B 1250 combines substantial continuous-current capability with a 42 kA short-circuit breaking capacity throughout its specified low-voltage AC range, making it suitable for demanding main distribution and feeder duties.
The PR123/P-LSIG electronic release combines long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection in a single advanced trip unit. These protection functions support selective and coordinated system design, while the four-pole construction makes this model particularly suitable for three-phase four-wire networks where neutral switching is required.
Typical Applications
- Industrial low-voltage distribution switchboards.
- Main incoming and feeder circuit protection.
- Three-phase four-wire distribution systems.
- Manufacturing plants and production facilities.
- Commercial and infrastructure electrical distribution systems.
- Motor control centres and industrial power systems.
- Generator and transformer distribution installations.
- Fixed switchboard installations requiring advanced LSIG protection.
Technical Specifications
| Series | SACE Emax / New Emax |
|---|---|
| ABB order code | 1SDA055647R1 |
| Product type | Air circuit breaker |
| Frame / sub-type | E1B 1250 |
| Short-circuit performance level | B |
| Rated current (In) | 1250 A |
| Rated operational current (Ie) | 1250 A |
| Rated uninterrupted current (Iu) | 1250 A |
| Number of poles | 4 |
| Current type | AC |
| Rated operational voltage | 690 V AC |
| Rated voltage (Ur) | 690 V |
| Rated insulation voltage (Ui) | 1000 V |
| Rated impulse withstand voltage (Uimp) | 12 kV |
| Rated ultimate short-circuit breaking capacity (Icu) | 42 kA at 220–690 V AC |
| Rated service short-circuit breaking capacity (Ics) | 42 kA at 220–690 V AC |
| Rated short-time withstand current (Icw) | 42 kA for 1 s |
| Trip unit | PR123/P-LSIG R1250 |
| Release type | Electronic |
| Protection functions | L, S, I and G |
| Overload release adjustment range | 400–1250 A |
| Short-time delayed short-circuit adjustment range | 750–12,500 A |
| Instantaneous short-circuit adjustment range | 1875–18,750 A |
| Integrated earth-fault protection | Yes |
| Installation | Fixed |
| Terminal arrangement | Rear flat horizontal |
| Auxiliary contacts | 4 total, 2 NO + 2 NC |
| Position indication | Circuit breaker open / closed |
| Power loss | 150 W |
| Electrical durability | 10,000 cycles at ≤440 V; 8000 cycles at 500–690 V |
| Mechanical durability | 25,000 cycles |
| Dimensions (W × H × D) | 386 × 418 × 302 mm |
| Weight | 50 kg |
| Standard | IEC |
| EAN | 8015644569877 |
Frequently Asked Questions
What is the ABB 1SDA055647R1 used for?
The ABB 1SDA055647R1 is a 1250 A four-pole SACE Emax air circuit breaker used for switching and protecting high-current low-voltage industrial and commercial electrical distribution systems.
What protection functions does the PR123/P-LSIG trip unit provide?
The PR123/P-LSIG electronic trip unit provides long-time overload (L), short-time short-circuit (S), instantaneous short-circuit (I) and earth-fault (G) protection.
What is the rated current of the ABB E1B 1250?
The ABB E1B 1250 has a rated uninterrupted current of 1250 A, and this version uses a four-pole configuration.
What is the breaking capacity of the ABB E1B 1250?
The E1B 1250 B-performance circuit breaker has rated ultimate and service short-circuit breaking capacities of 42 kA across 220–690 V AC, with a rated short-time withstand current of 42 kA for 1 s.
How is the ABB 1SDA055647R1 installed?
The 1SDA055647R1 is a fixed air circuit breaker with horizontal rear flat terminals for permanent installation within compatible low-voltage switchgear and distribution assemblies.
Trusted by Industrial Power Professionals Worldwide
ABB SACE Emax air circuit breakers are widely used in low-voltage distribution systems where dependable high-current switching, advanced electronic protection and robust switchboard integration are required.
