The bi-metallic thermal overload relay is the most widely used in industry and provides a high level of protection against small or prolonged overload conditions.
They may be used on a.c or d.c systems and generally feature:
Three pole operation and protection
Ambient temperature compensation, so that temperature fluctuations do not affect their overall performance
Single phase protection, this prevents the associated motor running in a single phase condition
Manual or automatic resetting
A graduated scale in “motor FLC” thus allowing the relay to be set according to the “full load current “ as shown on the motor plate.
Visit the Burnand XH Ltd website for more information on Overload Protection