1SDA072803R1 ABB Emax 2 E1.2B 1250 Ekip Dip LSIG 4-Pole Air Circuit Breaker

Why Choose the ABB 1SDA072803R1 Emax 2 E1.2B 1250 Air Circuit Breaker?

The ABB 1SDA072803R1 is a SACE Emax 2 E1.2B air circuit breaker designed for protection and switching in low-voltage electrical distribution systems. Configured as the E1.2B 1250 Ekip Dip LSIG 4p WMP, this four-pole withdrawable moving part combines a 1250 A rated uninterrupted current with ABB's Ekip Dip LSIG solid-state electronic protection release.

The Ekip Dip LSIG release provides long-time overload, short-time short-circuit, instantaneous short-circuit and ground-fault protection. This comprehensive protection combination helps safeguard distribution equipment against overloads, high short-circuit currents and ground-fault conditions while supporting coordinated protection within low-voltage installations.

The E1.2B performance level provides an ultimate short-circuit breaking capacity of 42 kA at 400–690 V AC and a rated short-time withstand current of 42 kA for 1 s. Its four-pole withdrawable construction, four auxiliary change-over contacts and open/closed position indication make it well suited to serviceable switchboard installations where the corresponding Emax 2 fixed part is installed separately.

Key Advantages

• Rated uninterrupted current of 1250 A for substantial low-voltage distribution loads.
• Four-pole configuration for four-pole switching and protection applications.
• Reliable Ekip Dip LSIG solid-state electronic protection release.
• Long-time, short-time, instantaneous and ground-fault protection in one trip unit.
• 42 kA ultimate short-circuit breaking capacity at 400–690 V AC.
• 42 kA short-time withstand current for 1 s supports selective distribution-system design.
• Withdrawable moving-part construction supports convenient inspection, maintenance and replacement.

Key Features

• ABB SACE Emax 2 E1.2 air circuit breaker platform.
• 1250 A rated uninterrupted current.
• Four-pole configuration.
• B short-circuit performance level.
• Ekip Dip LSIG solid-state electronic protection release.
• Long-time (L) overload protection.
• Short-time (S) short-circuit protection.
• Instantaneous (I) short-circuit protection.
• Ground-fault (G) protection.
• 42 kA Icu at 400–690 V AC.
• 42 kA Ics across the specified operational-voltage range.
• 42 kA Icw for 1 s and 24 kA for 3 s.
• Rated operational voltage of 690 V AC.
• Rated insulation voltage of 1000 V AC.
• Rated impulse withstand voltage of 12 kV.
• Four auxiliary contacts and circuit-breaker open/closed position indication.
• Withdrawable moving part (WMP) configuration.

Comprehensive LSIG Protection for Low-Voltage Distribution

The ABB SACE Emax 2 E1.2B provides switching and electronic protection for low-voltage power distribution systems. Its Ekip Dip release monitors circuit current and initiates interruption when configured protection thresholds are exceeded, helping protect conductors, switchgear and connected equipment against overload, short-circuit and ground-fault conditions.

The Ekip Dip LSIG release combines long-time overload, short-time delayed short-circuit, instantaneous short-circuit and ground-fault protection. Together with the 1250 A E1.2B frame, 42 kA breaking capacity and withdrawable architecture, the ABB 1SDA072803R1 provides a robust solution for distribution switchboards requiring comprehensive electronic protection and service-friendly circuit-breaker construction.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial electrical distribution systems.
• Transformer and feeder protection.
• Manufacturing and process facilities.
• Commercial and institutional building power distribution.
• Infrastructure systems requiring integrated ground-fault protection.