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1SDA055866R1 ABB E2N 1250 PR121/P-LSIG 1250 A 4-Pole Fixed Air Circuit Breaker
ABB 1SDA055866R1 E2N 1250 PR121/P-LSIG is a 1250 A four-pole fixed SACE Emax air circuit breaker with a PR121/P-LSIG R1250 electronic trip unit providing long-time, short-time, instantaneous and earth-fault protection.
£10,849.67
Why Choose the ABB E2N 1250 PR121/P-LSIG Air Circuit Breaker?
The ABB E2N 1250 PR121/P-LSIG, order code 1SDA055866R1, is a high-performance 1250 A four-pole fixed air circuit breaker designed for switching and comprehensive protection in low-voltage power distribution systems. Part of the ABB SACE Emax family, it combines robust high-current switching capability with a PR121/P-LSIG electronic overcurrent release for demanding industrial, commercial and infrastructure installations.
The PR121/P-LSIG R1250 electronic trip unit provides long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection. This LSIG configuration helps protect cables, busbars and connected equipment while supporting selective coordination throughout complex low-voltage distribution networks.
With a rated uninterrupted current of 1250 A and a four-pole fixed configuration, the E2N 1250 is designed for permanent installation in compatible low-voltage switchboards. The four-pole arrangement makes it particularly suitable for distribution systems requiring switching and protection across four conductors, while the E2N performance class provides robust short-circuit capability.
Key Advantages
- Heavy-duty 1250 A air circuit breaker for low-voltage power distribution.
- PR121/P-LSIG electronic trip unit provides comprehensive electronic protection.
- Includes long-time, short-time, instantaneous and earth-fault protection.
- Four-pole fixed construction for permanent switchboard installation.
- E2N performance class provides strong short-circuit protection for demanding networks.
- LSIG functionality supports coordinated protection of critical distribution circuits.
Key Features
- ABB SACE Emax E2N series.
- 1250 A rated uninterrupted current.
- Four-pole configuration.
- Fixed execution.
- PR121/P-LSIG R1250 electronic overcurrent release.
- Long-time overload protection.
- Short-time short-circuit protection.
- Instantaneous short-circuit protection.
- Integrated earth-fault protection.
- 690 V AC rated operational voltage.
- 1000 V rated insulation voltage.
- 12 kV rated impulse withstand voltage.
Comprehensive LSIG Protection for Power Distribution
The ABB SACE Emax E2N platform provides high-current switching and electronic protection for demanding low-voltage distribution circuits. Its electronic trip technology monitors current conditions and initiates breaker operation when configured protection thresholds are exceeded, helping safeguard conductors, busbars and connected electrical equipment against damaging electrical faults.
The PR121/P-LSIG release combines long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection. Together with the E2N's 65 kA breaking capability and 55 kA one-second short-time withstand rating, the 1SDA055866R1 provides comprehensive protection for demanding four-pole power distribution applications.
Typical Applications
- Industrial low-voltage switchboards.
- Main power distribution panels.
- Manufacturing and process plants.
- Commercial and infrastructure electrical distribution.
- Transformer secondary distribution systems.
- Four-wire distribution systems requiring earth-fault protection.
Technical Specifications
| Series | SACE Emax E2N |
|---|---|
| ABB order code | 1SDA055866R1 |
| ABB product group | 310513-New Emax |
| Product type | Air circuit breaker |
| Frame / designation | E2N 1250 |
| Rated uninterrupted current (Iu) | 1250 A |
| Number of poles | 4 |
| Execution | Fixed |
| Trip unit | PR121/P-LSIG R1250 |
| Trip unit type | Electronic |
| Protection functions | LSIG – long-time, short-time, instantaneous and earth-fault protection |
| Rated operational voltage | 690 V AC |
| Rated insulation voltage (Ui) | 1000 V |
| Rated impulse withstand voltage (Uimp) | 12 kV |
| Rated ultimate short-circuit breaking capacity (Icu) at 415 V AC | 65 kA |
| Rated service short-circuit breaking capacity (Ics) at 415 V AC | 65 kA |
| Rated short-time withstand current (Icw) | 55 kA for 1 s |
| Application | Low-voltage power distribution |
Frequently Asked Questions
What is the ABB 1SDA055866R1 used for?
It is a 1250 A four-pole fixed air circuit breaker designed for switching and comprehensive overcurrent and earth-fault protection in low-voltage power distribution systems.
What is the rated current of the ABB E2N 1250 PR121/P-LSIG?
The circuit breaker has a rated uninterrupted current of 1250 A.
What protection functions does the PR121/P-LSIG provide?
The PR121/P-LSIG electronic release provides long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection.
Is the ABB 1SDA055866R1 fixed or withdrawable?
This model is a four-pole fixed air circuit breaker designed for permanent installation in a compatible low-voltage switchboard.
What is the short-circuit performance of the ABB E2N 1250?
The E2N 1250 provides a rated ultimate and service short-circuit breaking capacity of 65 kA at 415 V AC and a rated short-time withstand current of 55 kA for 1 s.
Trusted ABB Power Distribution Technology
ABB SACE Emax air circuit breakers combine robust high-current switching with electronic protection technology for dependable operation in demanding industrial, commercial and infrastructure low-voltage distribution systems.
