Current Limiting Curve - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

Current limiting curve SACE Emax 2 series offer current-limiting circuit-breakers in E1.2 size up to 1600 A. These circuit-breakers
292 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
are characterized from the constructional point of view by the following features:
• Dedicated stored energy operating mechanism that reduces opening times.
• Specific main contacts that, by exploiting the electrodynamic forces generated by the short-circuit,
accelerate the opening of the main contacts.
These features enable rapid breaking and consequently reduce the electromechanical and thermal stress
suffered by the installation during a short-circuit. The Current-limiting circuit-breakers are characterized by
short-time withstand currents that are not particularly high and are therefore not suitable for applications
where selectivity towards more downstream devices is required or in case of devices with high inrush currents
in the start-up phase.
E1.2 L - Current-limiting curves
E1.2 L - Pass-through specific energy limitation curves
Mechanical accessories | 8 - Technical characteristics
ABB | SACE Emax 2