Why Choose the ABB 1SDA124918R1 Emax 3 Air Circuit Breaker?
The ABB 1SDA124918R1 is a high-performance low-voltage air circuit breaker (ACB) from the ABB SACE Emax 3 range, designed for reliable protection and control of high-current electrical distribution systems. This model is an E4.3N 4000 Ekip Aware LSI three-pole fixed air circuit breaker with a 4000 A rated current and electronic LSI protection.
The Emax 3 platform combines advanced electronic protection with robust switching performance for demanding low-voltage power distribution applications. The integrated Ekip Aware LSI release provides long-time, short-time and instantaneous protection functions, supporting accurate protection settings for large electrical installations.
With a 4000 A rated current, three-pole configuration and fixed mounting arrangement with horizontally oriented rear terminals, the ABB 1SDA124918R1 is suitable for high-capacity switchboards, industrial power distribution and critical electrical infrastructure. ABB documentation identifies the E4.3N 4000 version with an Icu of 66 kA at 440 V and an Icw of 66 kA for 1 s.
Key Advantages
- High-capacity ABB SACE Emax 3 air circuit breaker for low-voltage power distribution.
- 4000 A rated current for high-current electrical installations.
- Three-pole configuration for three-phase power distribution systems.
- Integrated Ekip Aware LSI electronic protection release.
- 66 kA Icu at 440 V for demanding short-circuit protection requirements.
- 66 kA short-time withstand current for 1 s.
- Fixed installation with horizontally oriented rear terminals.
Key Features
- ABB SACE Emax 3 E4.3N series.
- 4000 A rated current.
- Ekip Aware LSI electronic trip unit.
- Three-pole configuration.
- Fixed circuit breaker version.
- Long-time, short-time and instantaneous LSI protection functions.
- 66 kA rated ultimate short-circuit breaking capacity at 440 V.
- 66 kA rated short-time withstand current for 1 s.
- Rear horizontally oriented terminals (FHR).
Advanced Protection for High-Current Power Distribution
Air circuit breakers such as the ABB Emax 3 E4.3N provide switching and protection for high-current low-voltage electrical distribution systems. They are designed to interrupt fault currents and protect conductors, switchboards and connected equipment against damaging overcurrent conditions.
The integrated Ekip Aware LSI release provides electronic protection against long-duration overloads, short-time overcurrents and instantaneous short-circuit conditions. This enables the breaker to be configured for the protection requirements of large electrical distribution systems while supporting selective coordination with other protective devices.
Typical Applications
- Low-voltage main distribution switchboards.
- Industrial power distribution systems.
- Large commercial electrical installations.
- Data centre and critical power infrastructure.
- Industrial plants and manufacturing facilities.
- High-capacity electrical distribution and protection systems.
