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1SDA055660R1 ABB E1B 1250 PR122/P-LSI 1250A 4-Pole Withdrawable Air Circuit Breaker
ABB 1SDA055660R1 SACE Emax E1B 1250 is a 1250 A four-pole withdrawable air circuit breaker moving part with a PR122/P-LSI electronic trip unit providing LSI protection and 42 kA short-circuit breaking capacity across 220–690 V AC.
£10,399.03
Why Choose the ABB E1B 1250 PR122/P-LSI 1250A Air Circuit Breaker?
The ABB E1B 1250 PR122/P-LSI, order code 1SDA055660R1, is a high-performance 1250 A four-pole withdrawable air circuit breaker moving part designed for protection and switching in demanding low-voltage electrical distribution systems. Part of the proven ABB SACE Emax / New Emax range, it combines robust E1B short-circuit performance with a PR122/P-LSI electronic overcurrent release.
The fitted PR122/P-LSI electronic trip unit provides long-time overload, short-time delayed short-circuit and instantaneous short-circuit protection. Its adjustable protection settings allow the breaker to be coordinated with downstream equipment, helping improve selectivity while protecting cables, busbars and connected electrical equipment against damaging overcurrents.
Supplied as a withdrawable moving part, the breaker is designed for use with the appropriate ABB SACE Emax fixed part or cradle, allowing convenient isolation and removal for inspection and maintenance. Its four-pole arrangement is suitable for three-phase systems requiring neutral switching, while the E1B performance level provides 42 kA ultimate and service short-circuit breaking capacity throughout the specified 220–690 V AC range.
Key Advantages
- High-current 1250 A air circuit breaker for demanding low-voltage distribution systems.
- Four-pole configuration suitable for three-phase systems requiring neutral switching.
- PR122/P-LSI electronic trip unit provides adjustable electronic overcurrent protection.
- LSI protection functions cover long-time overload, short-time delayed and instantaneous short-circuit faults.
- 42 kA Icu and Ics across the specified 220–690 V AC range.
- 42 kA short-time withstand current for 1 s supports demanding distribution applications.
- Withdrawable construction facilitates circuit isolation, inspection and maintenance.
- Four-pole switching supports protection and isolation of three-phase four-wire systems.
Key Features
- ABB SACE Emax E1B series.
- 1250 A rated current.
- Four-pole configuration.
- PR122/P-LSI electronic overcurrent release.
- Long-time (L) overload protection.
- Short-time (S) delayed short-circuit protection.
- Instantaneous (I) short-circuit protection.
- 400–1250 A overload release adjustment range.
- 750–12,500 A short-time delayed short-circuit adjustment range.
- 1875–18,750 A instantaneous short-circuit adjustment range.
- 690 V AC rated operational voltage.
- 42 kA rated ultimate and service short-circuit breaking capacity.
- 42 kA Icw for 1 s and 36 kA for 3 s.
- Withdrawable moving-part construction.
Selective LSI Protection for High-Current Distribution
Air circuit breakers such as the ABB SACE Emax E1B protect high-current electrical distribution systems by detecting and interrupting abnormal current conditions before cables, busbars, switchgear and connected equipment can be damaged. This E1B 1250 combines a continuous current capability of 1250 A with 42 kA ultimate and service short-circuit breaking capacities across its specified low-voltage AC operating range.
The PR122/P-LSI electronic release combines long-time overload, short-time delayed short-circuit and instantaneous short-circuit protection in a single electronic trip unit. The short-time function is particularly useful for coordinated protection schemes where downstream devices are allowed time to clear faults first, while the withdrawable construction enables convenient isolation and removal of the breaker moving part for maintenance.
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.
- Switchboards requiring withdrawable circuit breakers with selective LSI protection.
Technical Specifications
| Series | SACE Emax / New Emax |
|---|---|
| ABB order code | 1SDA055660R1 |
| Product type | Air circuit breaker moving part |
| 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 | PR122/P-LSI |
| Release type | Electronic |
| Protection functions | L, S and I |
| 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 |
| Execution | Withdrawable |
| Component | Moving part (MP) |
| Terminal connection type | Withdrawable circuit breaker |
| Power loss | 230 W |
| Electrical durability | 10,000 cycles at ≤440 V; 8000 cycles at 500–690 V |
| Mechanical durability | 25,000 cycles |
| Product dimensions (W × H × D) | 414 × 461 × 396.5 mm |
| Product net weight | 54 kg |
| Standard | IEC |
| EAN | 8015644570002 |
Frequently Asked Questions
What is the ABB 1SDA055660R1 used for?
The ABB 1SDA055660R1 is a 1250 A four-pole SACE Emax withdrawable air circuit breaker moving part used for switching and protecting high-current low-voltage industrial and commercial electrical distribution systems.
What protection functions does the PR122/P-LSI trip unit provide?
The PR122/P-LSI electronic trip unit provides long-time overload (L), short-time delayed short-circuit (S) and instantaneous short-circuit (I) protection.
What is the breaking capacity of the ABB E1B 1250?
This E1B 1250 has rated ultimate and service short-circuit breaking capacities of 42 kA across 220–690 V AC, together with a rated short-time withstand current of 42 kA for 1 s.
Is the ABB 1SDA055660R1 fixed or withdrawable?
The 1SDA055660R1 is a withdrawable moving part designed for use with the appropriate compatible ABB SACE Emax fixed part or cradle, allowing the breaker to be isolated and removed for inspection or maintenance.
What is the difference between LSI and LSIG protection?
LSI provides long-time overload, short-time delayed short-circuit and instantaneous short-circuit protection. Unlike an LSIG release, the PR122/P-LSI configuration does not add the G earth-fault protection function.
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, adjustable electronic protection and service-friendly withdrawable construction are required.
