Mitsubishi MR-J3HC4S-15M Thermal Overload Relay for MELSERVO MR-J3 Systems

The Mitsubishi MR-J3HC4S-15M (MR-J3HC4S-15M) is a three-pole thermal overload relay designed for motor and motion control equipment within Mitsubishi Electric automation systems, including the TH-T series and MELSERVO MR-J3 configurations. This protective device safeguards industrial machinery against continuous electrical overloads and phase loss conditions through its integrated three-element thermal heating design. It features an adjustable trip current setting range from 5.2 A to 8 A, allowing operators to calibrate precise overload thresholds tailored to connected load specifications. The relay includes one normally open and one normally closed auxiliary contact for signaling, trip indication, and control circuit integration. Electrical connections are made via finger-safe screw clamp terminals, ensuring reliable wiring and enhanced operator safety during maintenance. Operating as an essential protective component, the unit prevents motor overheating, minimizes operational downtime, and maintains equipment longevity across manufacturing, conveyor systems, and industrial automated assemblies.