Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
1SDA055738R1 ABB E1N1250 PR121/P-LSIG 1250A 4P Fixed Air Circuit Breaker
ABB 1SDA055738R1 SACE Emax E1N1250 four-pole fixed air circuit breaker rated at 1250 A with a PR121/P-LSIG electronic trip unit providing comprehensive LSIG protection for low-voltage power distribution.
£10,629.38
Why Choose the ABB E1N1250 PR121/P-LSIG 1250A 4P Fixed Air Circuit Breaker?
The ABB E1N1250 PR121/P-LSIG, order code 1SDA055738R1, is a high-performance SACE Emax air circuit breaker designed for switching and comprehensive protection in low-voltage power distribution systems. Rated at 1250 A, this four-pole breaker combines the E1N frame with the PR121/P-LSIG electronic overcurrent release.
This model is supplied in a fixed four-pole configuration, making it suitable for permanent installation in industrial, commercial and infrastructure low-voltage switchboards. The four-pole arrangement supports applications where switching and isolation of the neutral conductor are required alongside the three phase conductors.
The PR121/P-LSIG electronic trip unit provides long-time overload, short-time short-circuit, instantaneous short-circuit and ground-fault protection. This comprehensive LSIG functionality makes the 1SDA055738R1 particularly suitable for main incomers, high-current feeders and other critical distribution circuits requiring coordinated electronic protection.
Key Advantages
- High-performance ABB SACE Emax E1N air circuit breaker.
- 1250 A rated current for high-current low-voltage distribution.
- Four-pole fixed configuration supports neutral switching and isolation.
- PR121/P-LSIG electronic overcurrent release.
- Comprehensive LSIG protection against overloads, short circuits and ground faults.
- E1N performance class for demanding low-voltage distribution applications.
- Fixed construction provides a robust solution for permanent switchboard installation.
Key Features
- ABB SACE Emax E1N series.
- 1250 A rated current.
- Four-pole (4P) construction.
- Fixed (F) circuit-breaker configuration.
- PR121/P-LSIG electronic trip unit.
- Long-time overload protection.
- Short-time short-circuit protection.
- Instantaneous short-circuit protection.
- Ground-fault protection.
- Suitable for high-current low-voltage power distribution.
- Designed for integration into industrial and commercial switchboards.
Comprehensive Protection for High-Current Power Distribution
The ABB SACE Emax E1N1250 is engineered for switching, isolation and protection of high-current low-voltage distribution circuits. Its fixed four-pole construction is well suited to permanent switchboard installations where the neutral conductor must be switched together with the phase conductors.
The PR121/P-LSIG electronic release provides coordinated protection against overloads, delayed and instantaneous short circuits and ground faults. This combination of high-current capability and comprehensive electronic protection makes the 1SDA055738R1 a dependable solution for critical incomers, feeders and distribution circuits.
Typical Applications
- Industrial low-voltage switchboards.
- Main incoming circuit protection.
- High-current feeder protection.
- Three-phase systems requiring neutral switching.
- Manufacturing and process plants.
- Commercial building power distribution.
- Infrastructure and utility distribution systems.
Technical Specifications
| Series | SACE Emax |
|---|---|
| Product group | New Emax |
| Order code | 1SDA055738R1 |
| Product type | Air circuit breaker |
| Frame / sub-type | E1N |
| Rated current | 1250 A |
| Number of poles | 4P |
| Version | Fixed |
| Trip unit | PR121/P-LSIG |
| Release type | Electronic |
| Protection functions | Long-time, short-time, instantaneous and ground fault (LSIG) |
| Current type | AC |
| Application | Low-voltage power distribution |
Frequently Asked Questions
What is the ABB 1SDA055738R1?
It is an ABB SACE Emax E1N1250 1250 A four-pole fixed air circuit breaker equipped with a PR121/P-LSIG electronic overcurrent release.
What is the rated current of the ABB E1N1250 1SDA055738R1?
The circuit breaker has a rated current of 1250 A.
What protection does the PR121/P-LSIG trip unit provide?
The PR121/P-LSIG provides long-time overload, short-time short-circuit, instantaneous short-circuit and ground-fault protection, collectively identified as LSIG protection.
How many poles does the ABB 1SDA055738R1 have?
The 1SDA055738R1 is a four-pole (4P) air circuit breaker, allowing the neutral conductor to be switched together with the three phase conductors where required.
Is the ABB 1SDA055738R1 fixed or withdrawable?
The 1SDA055738R1 is a fixed air circuit breaker designed for permanent installation within a compatible low-voltage switchboard.
Trusted by Power Distribution Professionals Worldwide
ABB SACE Emax air circuit breakers combine high-current switching capability with comprehensive electronic protection, providing dependable solutions for demanding industrial, commercial and infrastructure low-voltage distribution systems.
