The introduction of Electronic motor protection relay has negated all these problems. LS Electric-EMPR ensures very close protection for motors employed for all kinds of loads. A real boon to practicing engineers as relay characteristics suit Class-10, 10A, 20 & 30. You can set motor start times from 2 to 30 secs. Trip times during overloads are very much faster so also tripping during phase loss, which is as fast as 3 secs, unlike a thermal OLR which takes 20 long seconds to trip....