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1SDA056393R1 ABB E3H1250 PR121/P-LSI 1250A 4P Withdrawable Air Circuit Breaker
ABB 1SDA056393R1 E3H1250 is a 1250 A four-pole withdrawable SACE Emax air circuit breaker moving part with a PR121/P-LSI R1250 electronic overcurrent release for low-voltage power distribution protection.
£11,757.89
Why Choose the ABB E3H1250 PR121/P-LSI 1250A 4P Withdrawable Air Circuit Breaker?
The ABB E3H1250 PR121/P-LSI, order code 1SDA056393R1, is a high-performance 1250 A four-pole air circuit breaker moving part from the ABB SACE Emax E3 series, designed for protection and switching in demanding low-voltage industrial and commercial power distribution systems. This E3H configuration combines a withdrawable design with the PR121/P-LSI electronic overcurrent release for dependable circuit protection.
The PR121/P-LSI trip unit provides long-time, short-time and instantaneous protection, helping protect cables, busbars and connected equipment against overload and short-circuit conditions. The moving-part configuration is intended for a compatible SACE Emax fixed part, allowing the circuit breaker to be withdrawn for inspection, maintenance and replacement while supporting flexible switchboard operation.
With a rated current of 1250 A and a four-pole configuration, the E3H1250 is engineered for substantial distribution loads where dependable switching, selective protection and high fault-clearing performance are required. It is also equipped with four auxiliary contacts and circuit-breaker open/closed position indication for integration into switchboard control and signalling systems.
Key Advantages
- High-performance ABB SACE Emax E3H air circuit breaker moving part.
- 1250 A rated current for high-current low-voltage distribution.
- Four-pole configuration for three-phase systems with neutral switching.
- PR121/P-LSI electronic release provides long-time, short-time and instantaneous protection.
- Withdrawable moving-part construction supports convenient switchboard maintenance and servicing.
- Supplied with four auxiliary contacts and open/closed position indication.
Key Features
- ABB SACE Emax E3H1250 circuit breaker platform.
- 1250 A rated current.
- 4-pole configuration.
- PR121/P-LSI R1250 electronic overcurrent release.
- LSI protection: long-time, short-time and instantaneous functions.
- Withdrawable moving-part version for compatible SACE Emax switchgear.
- Four auxiliary contacts for signalling and control.
- Circuit-breaker open/closed position indication.
- Designed for demanding industrial and commercial low-voltage distribution systems.
Reliable Protection for Low-Voltage Power Distribution
Air circuit breakers such as the ABB SACE Emax E3H1250 provide switching, isolation and overcurrent protection for high-current low-voltage electrical systems. The PR121/P-LSI electronic release monitors circuit current and initiates tripping according to configured protection thresholds when overload or short-circuit conditions occur.
The withdrawable Emax design is particularly suitable for switchboards where maintainability and operational flexibility are important. Its four-pole construction, electronic LSI protection and auxiliary signalling contacts make the E3H1250 suitable for main distribution boards, industrial switchgear and other critical power distribution applications.
Typical Applications
- Low-voltage main distribution switchboards.
- Industrial power distribution systems.
- Main incomer and outgoing feeder protection.
- Manufacturing and process facilities.
- Commercial building electrical distribution.
- Withdrawable switchgear requiring selective LSI protection.
Technical Specifications
| Series | SACE Emax E3 |
|---|---|
| ABB order code | 1SDA056393R1 |
| Product type | Air circuit breaker moving part |
| Performance level | H |
| Rated current (In) | 1250 A |
| Number of poles | 4P |
| Version | Withdrawable moving part |
| Release | PR121/P-LSI R1250 |
| Release type | Electronic overcurrent release |
| Protection functions | L, S, I |
| Current type | AC |
| Auxiliary contacts | 4 |
| Position indication | Circuit breaker open / closed |
| Mechanical durability | 20,000 cycles |
| Electrical durability | 12,000 cycles |
| Dimensions (W × H × D) | 558 × 461 × 396.5 mm |
| Net weight | 81 kg |
| EAN | 8015644577339 |
Frequently Asked Questions
What is the ABB 1SDA056393R1 used for?
It is a 1250 A four-pole SACE Emax air circuit breaker moving part designed for switching and protecting high-current low-voltage power distribution circuits.
What protection release is fitted to the ABB E3H1250?
The breaker is fitted with an ABB PR121/P-LSI R1250 electronic overcurrent release, providing long-time, short-time and instantaneous protection.
What is the rated current of ABB 1SDA056393R1?
The E3H1250 configuration has a rated current of 1250 A and uses a four-pole arrangement.
Is the ABB 1SDA056393R1 fixed or withdrawable?
The 1SDA056393R1 is a withdrawable moving-part version designed for use with a compatible ABB SACE Emax fixed part.
What protection functions does the PR121/P-LSI provide?
The PR121/P-LSI provides L, S and I protection functions for long-time overload, short-time short-circuit and instantaneous short-circuit protection.
Trusted Protection from ABB SACE
ABB SACE Emax air circuit breakers are engineered for demanding low-voltage power distribution applications, combining electronic overcurrent protection, robust construction and withdrawable switchgear flexibility for industrial and commercial electrical systems.
