The **JR-36-R** typically refers to a **Thermal Overload Relay**, commonly used in industrial motor control circuits to protect motors from overheating and phase failures. It is designed to be paired with an AC Contactor (often the CJX2 series). ### 1. Key Technical Specifications | Parameter | Specification (Typical) | | :--- | :--- | | **Model Number** | JR-36-R | | **Protection Type** | Overload and Phase Failure | | **Contact Configuration** | 1 NO (Normally Open) + 1 NC (Normally Closed) | | **Rated Voltage (Ue)** | Up to 690V AC | | **Reset Method** | Manual or Automatic (Switchable) | | **Tripping Class** | Class 10A (Standard industrial trip speed) | --- ### 2. Core Electronic and Mechanical Components The JR-36-R operates on the principle of **electro-thermal conversion**. Below are the primary internal parts: #### A. Bimetallic Strips The heart of the relay consists of three bimetallic strips (one for each phase). When current flows through them, they heat up. Because the two metals have different expansion coefficients, the strip bends. If the current is excessive (overload), the bend becomes severe enough to trigger the trip mechanism. #### B. Auxiliary Contacts * **NC (95-96):** Connected in series with the contactor coil. When a fault occurs, this opens, cutting power to the coil and stopping the motor. * **NO (97-98):** Used for signaling. It closes during a fault to turn on a warning light or send a signal to a PLC. #### C. Adjustment Dial A rotating current setting scale that allows the user to set the trip threshold according to the motor's **Full Load Amps (FLA)**. #### D. Reset and Test Buttons * **Reset Button:** Used to restore the circuit after the bimetallic strips have cooled down. * **Test/Stop Button:** Manually simulates a trip to ensure the auxiliary contacts are functioning correctly. --- ### 3. Connection Diagram Logic ```mermaid graph LR A[Power Supply] --> B[CJX2 Contactor] B --> C[JR-36-R Relay] C --> D[Industrial Motor] subgraph Protection_Loop C -- "NC Contact 95/96" --> B end ``` --- ### 4. Selection Table (Current Ranges) The "R" in the model often signifies the specific current range plug-in. Common ranges for this series include: | Setting Range (A) | Compatible Contactor | | :--- | :--- | | 0.25 - 0.35A | CJX2-09 to 32 | | 1.0 - 1.6A | CJX2-09 to 32 | | 10 - 16A | CJX2-18 to 32 | | 28 - 45A | CJX2-40 to 95 |