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1SDA055632R1 ABB E1B 1250 PR121/P-LI 1250A 3-Pole Fixed Air Circuit Breaker
ABB 1SDA055632R1 SACE Emax E1B 1250 is a 1250 A three-pole fixed air circuit breaker with horizontal rear terminals, a PR121/P-LI electronic trip unit and 42 kA short-circuit breaking capacity for low-voltage power distribution.
£7,290.83
Why Choose the ABB E1B 1250 PR121/P-LI 1250A Air Circuit Breaker?
The ABB E1B 1250 PR121/P-LI, order code 1SDA055632R1, is a high-performance 1250 A three-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 a PR121/P-LI electronic overcurrent release for dependable protection of industrial power networks.
This E1B circuit breaker is supplied in a fixed configuration with horizontal rear terminals, providing a robust installation arrangement for low-voltage switchboards and distribution assemblies. The PR121/P-LI electronic trip unit provides long-time and instantaneous protection functions, helping protect electrical installations against sustained overloads and high-level short-circuit faults.
With a rated uninterrupted current of 1250 A, three-pole construction and a rated ultimate short-circuit breaking capacity of 42 kA up to 690 V AC, the E1B 1250 is engineered for demanding industrial distribution applications. It is also fitted with four auxiliary contacts and circuit-breaker open/closed position indication for integration into control, signalling and monitoring systems.
Key Advantages
- High-current 1250 A air circuit breaker for low-voltage power distribution.
- PR121/P-LI electronic trip unit provides reliable electronic overcurrent protection.
- LI protection functions provide long-time overload and instantaneous short-circuit protection.
- 42 kA rated ultimate short-circuit breaking capacity across the specified low-voltage AC range.
- 42 kA short-time withstand current for 1 s for demanding distribution systems.
- Fixed installation with horizontal rear terminals for switchboard integration.
- Three-pole configuration for three-phase electrical distribution systems.
- Four auxiliary contacts support circuit-breaker status signalling and control.
Key Features
- ABB SACE Emax E1B series.
- 1250 A rated uninterrupted current.
- Three-pole configuration.
- PR121/P-LI R1250 electronic overcurrent release.
- Long-time (L) overload protection.
- Instantaneous (I) short-circuit protection.
- 42 kA Icu rated ultimate short-circuit breaking capacity.
- 42 kA Ics rated service short-circuit breaking capacity.
- 42 kA Icw for 1 s short-time withstand current.
- 690 V AC rated operational voltage.
- 1,000 V rated insulation voltage.
- 12 kV rated impulse withstand voltage.
- Fixed circuit-breaker construction with horizontal rear terminals.
- Four auxiliary contacts with open/closed position indication.
Reliable 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 a substantial continuous-current rating with high short-circuit performance, making it suitable for main distribution and feeder protection in demanding industrial installations.
The PR121/P-LI electronic release combines long-time overload and instantaneous short-circuit protection in a single trip unit. This allows the breaker to respond to sustained overcurrent conditions as well as severe short circuits, while the fixed construction and horizontal rear terminals provide a secure arrangement for permanent installation within compatible low-voltage switchboards.
Typical Applications
- Industrial low-voltage distribution switchboards.
- Main incoming and feeder circuit protection.
- Manufacturing plants and production facilities.
- Commercial and infrastructure electrical distribution systems.
- Motor control centres and industrial power systems.
- Generator and transformer distribution installations.
- High-current three-phase distribution systems.
- Fixed switchboard installations requiring rear terminal connections.
Technical Specifications
| Series | SACE Emax / New Emax |
|---|---|
| ABB order code | 1SDA055632R1 |
| Product type | Air circuit breaker |
| Frame / sub-type | E1B |
| 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 | 3 |
| Rated operational voltage | 690 V AC |
| Rated voltage (Ur) | 690 V |
| Rated insulation voltage (Ui) | 1,000 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 | PR121/P-LI R1250 |
| Release type | Electronic overcurrent release |
| Protection functions | L and I |
| Installation | Fixed |
| Terminal arrangement | Horizontal rear terminals (HR) |
| Auxiliary contacts | 4 |
| Position indication | Circuit breaker open / closed |
| Power loss | 150 W |
| Mechanical durability | 25,000 cycles |
| Standard | IEC |
| EAN | 8015644569723 |
Frequently Asked Questions
What is the ABB 1SDA055632R1 used for?
The ABB 1SDA055632R1 is a 1250 A three-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 PR121/P-LI trip unit provide?
The PR121/P-LI electronic trip unit provides long-time overload (L) and instantaneous short-circuit (I) 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 three-pole configuration.
What is the breaking capacity of the ABB E1B 1250?
The E1B 1250 has a rated ultimate short-circuit breaking capacity of 42 kA across its specified 220–690 V AC operating-voltage range, with a short-time withstand current of 42 kA for 1 s.
Is the ABB 1SDA055632R1 a fixed or withdrawable circuit breaker?
The 1SDA055632R1 is a fixed circuit breaker equipped with horizontal rear terminals for connection within compatible low-voltage switchgear.
Trusted by Industrial Power Professionals Worldwide
ABB SACE Emax air circuit breakers are engineered for dependable switching and protection in demanding low-voltage distribution systems, combining high-current performance, electronic protection and robust switchboard integration for industrial power applications.
