What is an overload relay?

An overload relay protects motors from sustained over-current by tripping the contactor when current exceeds a set value for too long. Available as thermal, electronic or microprocessor-based types, it prevents motor burnout. Darshil supplies Siemens overload relays.

How does an overload relay protect a motor?

An overload relay senses motor current and, if it stays above the set limit for too long, signals the contactor to disconnect the motor. This prevents overheating and winding damage from overload, single-phasing or stalled conditions.

How do I set an overload relay?

Set the overload relay to the motor's full-load current (FLC) shown on its nameplate, then fine-tune for ambient and duty conditions. Darshil Enterprise helps select and set Siemens overload relays for your contactor and motor rating.