Mitsubishi MR-J3HC3SB-25M Thermal Overload Relay for MELSERVO MR-J3

The Mitsubishi MR-J3HC3SB-25M (MR-J3HC3SB-25M) is a three-pole thermal overload relay designed to provide dependable motor and circuit protection against overcurrent and phase loss conditions. Built for integration with Mitsubishi MELSERVO MR-J3 series installations and TH-N series compatible equipment, this thermal protection unit features three bimetallic heating elements that monitor phase balance and protect machinery from prolonged thermal overload. It offers a broad trip current adjustment range from 260 to 400 A, allowing precise calibration to match connected equipment ratings. For signaling and safety interlocking within control circuits, the unit includes one normally open and one normally closed auxiliary contact. Durable mechanical lug terminals ensure secure wiring connections in demanding industrial automation environments, power distribution panels, and motor control centers. Serving as an equivalent solution to the TH-N400RHKPUL330A configuration, this relay protects motors and drives from overheating, phase failure, and operational faults across manufacturing and automation facilities.