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1SDA056176R1 ABB E3S 1250 PR121/P-LI 1250 A 3-Pole Fixed Air Circuit Breaker
ABB 1SDA056176R1 E3S 1250 is a 1250 A three-pole fixed SACE Emax air circuit breaker with rear horizontal terminals and a PR121/P-LI electronic overcurrent release for low-voltage power distribution protection.
£8,058.57
Why Choose the ABB E3S 1250 PR121/P-LI Air Circuit Breaker?
The ABB E3S 1250 PR121/P-LI, order code 1SDA056176R1, is a high-performance SACE Emax air circuit breaker (ACB) designed for switching and protection of high-current low-voltage power distribution systems. Part of the proven ABB SACE Emax E3 series, this three-pole fixed circuit breaker combines a 1250 A rated current with the PR121/P-LI electronic overcurrent release for dependable protection in demanding industrial and commercial installations.
The PR121/P-LI electronic trip unit provides long-time overload and instantaneous short-circuit protection. These LI protection functions help safeguard electrical networks, conductors and connected equipment against damaging overcurrent conditions while providing straightforward electronic protection for power distribution applications.
With a rated operational voltage of 690 V AC and a rated ultimate short-circuit breaking capacity of 75 kA, the E3S 1250 is suitable for demanding main distribution and high-power switchboard applications. This version features a three-pole fixed configuration with rear horizontal terminals, four auxiliary contacts and circuit-breaker open/closed position indication.
Key Advantages
- Heavy-duty 1250 A air circuit breaker for low-voltage power distribution.
- PR121/P-LI electronic overcurrent release for overload and short-circuit protection.
- LI functions provide long-time and instantaneous protection.
- Three-pole fixed configuration for permanent switchboard installation.
- Rear horizontal terminals support practical connection to switchboard busbars.
- 75 kA short-circuit breaking capacity provides robust protection for demanding electrical networks.
Key Features
- ABB SACE Emax E3S series.
- 1250 A rated uninterrupted current.
- 690 V AC rated operational voltage.
- PR121/P-LI electronic trip unit.
- Long-time and instantaneous overcurrent protection.
- Three-pole fixed construction.
- Rear horizontal terminal arrangement.
- 75 kA rated ultimate short-circuit breaking capacity at 400–415 V AC.
- 75 kA rated short-time withstand current for 1 s.
- Four auxiliary contacts with circuit-breaker open/closed position indication.
Reliable Protection for High-Current Power Distribution
Air circuit breakers such as the ABB E3S protect high-current low-voltage distribution circuits by interrupting the supply when electrical conditions exceed configured protection thresholds. Electronic trip technology provides dependable detection of overload and short-circuit conditions, helping protect conductors, switchgear and connected equipment.
The PR121/P-LI release combines essential electronic protection functions with the robust E3S breaker platform. Its fixed construction, high short-circuit capability and rear horizontal terminals make this version particularly suitable for main distribution boards and industrial switchgear requiring dependable protection and straightforward busbar integration.
Typical Applications
- Main low-voltage distribution switchboards.
- Industrial power distribution systems.
- Manufacturing and process plants.
- Commercial and infrastructure electrical installations.
- Transformer and generator protection applications.
- High-current switchgear and distribution assemblies.
Technical Specifications
| Series | SACE Emax E3 |
|---|---|
| Order code | 1SDA056176R1 |
| Product type | Air circuit breaker |
| Rated uninterrupted current (Iu) | 1250 A |
| Rated operational current (Ie) | 1250 A |
| Rated operational voltage | 690 V AC |
| Rated insulation voltage (Ui) | 1000 V |
| Rated impulse withstand voltage (Uimp) | 12 kV |
| Number of poles | 3 |
| Installation | Fixed |
| Terminal connection | Rear horizontal |
| Trip unit | PR121/P-LI electronic overcurrent release |
| Protection functions | Long-time and instantaneous |
| Short-circuit performance level | S |
| Rated ultimate short-circuit breaking capacity (Icu) at 400–415 V AC | 75 kA |
| Rated service short-circuit breaking capacity (Ics) at 400–415 V AC | 75 kA |
| Rated short-time withstand current (Icw), 1 s | 75 kA |
| Rated short-time withstand current (Icw), 3 s | 65 kA |
| Current type | AC |
| Power loss | 60 W |
| Mechanical durability | 20,000 cycles |
| Dimensions (W × H × D) | 404 × 418 × 302 mm |
| Net weight | 60 kg |
| Standard | IEC |
| EAN | 8015644575168 |
Frequently Asked Questions
What is the ABB 1SDA056176R1 used for?
It is a 1250 A air circuit breaker designed for switching and overcurrent protection in high-current low-voltage power distribution systems.
What protection unit is fitted to this circuit breaker?
The breaker is fitted with an ABB PR121/P-LI electronic overcurrent release, providing long-time overload and instantaneous short-circuit protection.
What is the current rating of the ABB E3S 1250?
This version has a rated uninterrupted current of 1250 A.
Is the ABB 1SDA056176R1 fixed or withdrawable?
The 1SDA056176R1 is a three-pole fixed air circuit breaker with rear horizontal terminals.
What is the short-circuit breaking capacity?
The E3S 1250 has a rated ultimate short-circuit breaking capacity of 75 kA at 400–415 V AC.
Trusted Low-Voltage Protection from ABB
ABB SACE Emax air circuit breakers are engineered for dependable switching and protection in demanding low-voltage power distribution systems, combining high current capability, electronic protection and robust switchboard integration.
