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1SDA055865R1 ABB E2N 1250 PR121/P-LSI 1250 A 4-Pole Fixed Air Circuit Breaker
ABB 1SDA055865R1 E2N 1250 PR121/P-LSI is a 1250 A four-pole fixed SACE Emax air circuit breaker with horizontal rear terminals and a PR121/P-LSI R1250 electronic trip unit providing long-time, short-time and instantaneous overcurrent protection.
£10,387.62
Why Choose the ABB E2N 1250 PR121/P-LSI Air Circuit Breaker?
The ABB E2N 1250 PR121/P-LSI, order code 1SDA055865R1, is a high-performance 1250 A four-pole fixed air circuit breaker designed for switching and overcurrent 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-LSI electronic overcurrent release for demanding industrial, commercial and infrastructure installations.
The PR121/P-LSI R1250 electronic trip unit provides long-time overload, short-time short-circuit and instantaneous short-circuit protection. This LSI configuration supports selective coordination while helping protect cables, busbars and connected equipment against sustained overloads and short-circuit currents.
With a rated uninterrupted current of 1250 A, a four-pole fixed configuration and horizontal rear terminals, the E2N 1250 is designed for permanent installation in compatible low-voltage switchboards. Its E2N performance level 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.
Key Advantages
- Heavy-duty 1250 A air circuit breaker for low-voltage power distribution.
- PR121/P-LSI electronic trip unit provides adjustable electronic overcurrent protection.
- Includes long-time, short-time and instantaneous protection.
- Four-pole fixed construction for permanent switchboard installation.
- 65 kA ultimate and service breaking capacity at 415 V AC.
- Horizontal rear terminals support connection to compatible switchboard busbar systems.
Key Features
- ABB SACE Emax E2N series.
- 1250 A rated uninterrupted current.
- Four-pole configuration.
- Fixed execution.
- PR121/P-LSI R1250 electronic overcurrent release.
- Long-time overload protection.
- Short-time short-circuit protection.
- Instantaneous short-circuit protection.
- Horizontal rear terminals.
- 690 V AC rated operational voltage.
- 1000 V rated insulation voltage.
- 12 kV rated impulse withstand voltage.
Selective Protection for High-Current Distribution Systems
The ABB SACE Emax E2N platform provides high-current switching and electronic overcurrent protection for demanding low-voltage distribution circuits. The PR121/P trip technology monitors current conditions and initiates breaker operation when configured thresholds are exceeded, helping protect conductors, busbars and connected equipment against damaging overloads and short circuits.
The PR121/P-LSI release combines long-time overload protection with short-time and instantaneous short-circuit protection, allowing greater coordination between upstream and downstream protective devices than a basic LI configuration. Together with the E2N's 65 kA breaking capability and 55 kA one-second withstand rating, the 1SDA055865R1 is well suited to demanding main and feeder 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 high-current feeder and distribution circuits.
Technical Specifications
| Series | SACE Emax E2N |
|---|---|
| ABB order code | 1SDA055865R1 |
| EAN | 8015644572051 |
| Product type | Air circuit breaker |
| Frame / designation | E2N-12 |
| Rated uninterrupted current (Iu) | 1250 A |
| Rated operational current (Ie) | 1250 A |
| Number of poles | 4 |
| Execution | Fixed |
| Terminal arrangement | Horizontal rear terminals |
| Trip unit | PR121/P-LSI R1250 |
| Trip unit type | Electronic |
| Protection functions | LSI – long-time, short-time and instantaneous 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 |
| Overload release adjustment range | 500–1250 A |
| Short-time short-circuit adjustment range | 1250–12500 A |
| Instantaneous short-circuit adjustment range | 1875–18750 A |
| Power loss | 70 W |
| Mechanical endurance | 25,000 cycles |
Frequently Asked Questions
What is the ABB 1SDA055865R1 used for?
It is a 1250 A four-pole fixed air circuit breaker designed for switching and overcurrent protection in low-voltage power distribution systems.
What is the rated current of the ABB E2N 1250 PR121/P-LSI?
The circuit breaker has a rated uninterrupted current of 1250 A.
What protection functions does the PR121/P-LSI provide?
The PR121/P-LSI R1250 electronic release provides long-time overload, short-time short-circuit and instantaneous short-circuit protection.
Is the ABB 1SDA055865R1 fixed or withdrawable?
This model is a four-pole fixed air circuit breaker with horizontal rear terminals for permanent installation in a compatible low-voltage switchboard.
What is the short-circuit performance of the ABB E2N 1250?
The E2N 1250 has 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.
