The **JR-36-R** typically refers to a **Thermal Overload Relay**, commonly used in industrial motor control systems. These devices are designed to protect electric motors from overheating or phase failure by breaking the circuit when the current exceeds a predetermined limit for a specific duration. --- ### 1. Technical Specifications The "36" in the series name often indicates the design frame, while the suffix "R" generally denotes specific reset or mounting characteristics. | Feature | Specification | | :--- | :--- | | **Type** | Bimetallic Thermal Overload Relay | | **Standard** | IEC 60947-4-1 | | **Trip Class** | Class 10A (Typical) | | **Phase Failure Protection** | Yes (Differential mechanism) | | **Adjustment Range** | Variable (e.g., 20A–32A, depending on the specific model) | | **Contact Configuration** | 1 NO (Normally Open) + 1 NC (Normally Closed) | --- ### 2. Core Electronic/Mechanical Components While primarily electromechanical, the relay consists of several critical internal parts: * **Bimetallic Strips:** The heart of the device. These consist of two different metals bonded together. As current flows through them, they heat up and bend at different rates, eventually triggering the trip mechanism. * **Heating Elements:** Coils wrapped around or positioned near the bimetallic strips that convert the motor current into thermal energy. * **Differential Mechanism:** A slider system that detects if one phase is drawing significantly less current than the others (indicating a phase loss), causing the relay to trip faster. * **Auxiliary Contacts:** * **95-96 (NC):** Opens the coil circuit of the contactor to stop the motor. * **97-98 (NO):** Closes to provide a fault signal or alarm. * **Adjustment Dial:** A potentiometer-style dial used to set the "Full Load Amps" (FLA) according to the motor's nameplate. --- ### 3. Connection and Wiring The JR-36 series is designed to be mounted directly to a contactor or used as a standalone unit with a mounting base. ```mermaid graph LR A[Power Supply] --> B[Contactor] B --> C[JR-36-R Overload Relay] C --> D[Electric Motor] ``` ### 4. Key Functions 1. **Inverse Time Delay:** The higher the overcurrent, the faster the relay trips. 2. **Temperature Compensation:** Designed to operate consistently even if the ambient temperature of the control panel changes. 3. **Manual/Auto Reset:** Features a blue button to reset the device after a trip has occurred (once the bimetal has cooled). ---