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1SDA055521R1 ABB E4H 4000A 4P PR121/P-LSI Air Circuit Breaker
ABB 1SDA055521R1 is a SACE Emax E4H 4000 A four-pole fixed air circuit breaker with full-size neutral, rear horizontal terminals and a PR121/P-LSI electronic overcurrent release.
£37,445.96
Why Choose the ABB E4H/f 4000 PR121/P-LSI 1SDA055521R1 Circuit Breaker?
The ABB 1SDA055521R1 is a high-performance SACE Emax E4H air circuit breaker designed for protection and switching in demanding low-voltage power distribution systems. Rated at 4000 A, this four-pole fixed circuit breaker combines the E4 frame with ABB's H performance level and a PR121/P-LSI electronic overcurrent release.
This Emax circuit breaker is configured as a four-pole fixed version with full-size neutral and rear horizontal terminals. The PR121/P-LSI trip unit provides long-time overload, short-time delayed short-circuit and instantaneous short-circuit protection, giving comprehensive overcurrent protection for high-current distribution circuits.
With a rated uninterrupted current of 4000 A, a rated operational voltage of 690 V AC and an ultimate short-circuit breaking capacity of 100 kA at 400 V AC, the 1SDA055521R1 is suited to high-capacity industrial and commercial switchboards. It is also fitted with four auxiliary change-over contacts and open/closed position indication for integration into control and monitoring systems.
Key Advantages
- High-current 4000 A SACE Emax air circuit breaker.
- Four-pole fixed configuration with full-size neutral.
- 100 kA ultimate breaking capacity at 400 V AC for demanding distribution applications.
- PR121/P-LSI electronic trip unit provides comprehensive overcurrent protection.
- Rear horizontal terminals support practical switchboard busbar connections.
- Fitted with four auxiliary change-over contacts and open/closed position indication.
Key Features
- ABB SACE Emax E4H air circuit breaker.
- 4000 A rated uninterrupted current.
- Four-pole (4P) configuration.
- Full-size neutral arrangement.
- Fixed (F) circuit breaker version.
- PR121/P-LSI electronic overcurrent release with R4000 rating.
- LSI protection functions for long-time, short-time and instantaneous protection.
- 690 V AC rated operational voltage.
- 100 kA breaking capacity at 400 V AC.
- Rear horizontal (HR) terminal arrangement.
- Four auxiliary change-over contacts for signalling and control.
- Open/closed circuit-breaker position indication.
High-Current LSI Protection for Low-Voltage Distribution
Air circuit breakers such as the ABB SACE Emax E4H provide switching and overcurrent protection for high-current low-voltage distribution systems. The E4H platform combines a 4000 A current rating with high short-circuit performance, making it suitable for main distribution and feeder applications where dependable fault interruption is essential.
The PR121/P-LSI electronic release provides three principal protection functions: long-time protection against sustained overloads, short-time protection with delay for selective coordination, and instantaneous protection against severe short circuits. This combination supports effective protection and selectivity within complex industrial power distribution networks.
Typical Applications
- Main low-voltage distribution switchboards.
- Industrial power distribution systems.
- Manufacturing and process plants.
- Commercial and infrastructure electrical systems.
- High-current incoming and feeder circuits.
- Power distribution and switchgear assemblies.
Technical Specifications
| Series | SACE Emax |
|---|---|
| ABB order code | 1SDA055521R1 |
| Product type | Air circuit breaker |
| Frame / subtype | E4H |
| Rated uninterrupted current | 4000 A |
| Rated operational voltage | 690 V AC |
| Ultimate short-circuit breaking capacity at 400 V, 50 Hz | 100 kA |
| Number of poles | 4P |
| Neutral | Full size |
| Version | Fixed |
| Trip unit | PR121/P-LSI R4000 |
| Release type | Electronic |
| Protection functions | Long-time, short-time and instantaneous (LSI) |
| Overload release setting range | 1600–4000 A |
| Short-time delayed short-circuit setting range | 4000–40000 A |
| Instantaneous short-circuit setting range | 6000–60000 A |
| Terminal arrangement | Rear horizontal |
| Auxiliary contacts | 4 change-over contacts |
| Position indication | Circuit breaker open / closed |
| Motor drive | Optional |
| Integrated earth-fault protection | No |
| Product group | 310513-New Emax |
| EAN | 8015644568610 |
| Weight | 128 kg |
Frequently Asked Questions
What is the ABB 1SDA055521R1?
It is an ABB SACE Emax E4H 4000 A four-pole fixed air circuit breaker with full-size neutral, rear horizontal terminals and a PR121/P-LSI electronic overcurrent release.
What is the rated current of the ABB 1SDA055521R1?
The circuit breaker has a rated uninterrupted current of 4000 A, making it suitable for high-current low-voltage power distribution applications.
What protection functions does the PR121/P-LSI trip unit provide?
The PR121/P-LSI electronic trip unit provides long-time overload, short-time delayed short-circuit and instantaneous short-circuit protection.
What is the breaking capacity of the ABB 1SDA055521R1?
The E4H circuit breaker has an ultimate short-circuit breaking capacity of 100 kA at 400 V AC, 50 Hz.
Is the ABB 1SDA055521R1 fixed or withdrawable?
The 1SDA055521R1 is a fixed four-pole circuit breaker with a full-size neutral and rear horizontal terminals.
Trusted ABB Power Distribution Protection
ABB SACE Emax air circuit breakers are engineered for reliable switching and protection in demanding low-voltage power distribution systems, combining high current capacity, electronic protection and flexible switchboard integration.
