Page 177 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
Current limiting curve SACE Emax 2 series offer current-limiting circuit-breakers in E1.2 size up to 1600 A. These circuit-breakers
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

175 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Mechanical characteristics | 5 - Technical characteristics