The **JR16-R-4LCM115** is a specific model of an **Overload Relay**, commonly used in industrial motor control circuits to protect motors from overheating and phase failures. It is typically part of the JR16 series, which is designed to be compatible with AC contactors. --- ## Technical Specifications The following table breaks down the core technical parameters of the JR16-R-4LCM115: | Parameter | Specification | | :--- | :--- | | **Model Type** | Thermal Overload Relay | | **Control Voltage (Coil/Aux)** | 115V AC | | **Reset Method** | Manual or Automatic (Switchable) | | **Number of Poles** | 3 Poles (Three-phase protection) | | **Auxiliary Contacts** | 1 NO (Normally Open) + 1 NC (Normally Closed) | | **Application** | Motor Overload & Phase Failure Protection | --- ## Key Components and Features ### 1. Bimetallic Strips The heart of the relay contains three bimetallic strips (one for each phase). When current flows through these strips, they heat up. If the current exceeds the set limit for too long, the strips bend sufficiently to trip the internal mechanism. ### 2. Current Adjustment Dial The "4L" in the model name often refers to a specific current range (e.g., 2.5A to 4A, though this varies by manufacturer). The unit features a rotary dial that allows the user to calibrate the trip point to the motor's Full Load Amps (FLA). ### 3. Auxiliary Contacts (1NO + 1NC) These are used to interface with the rest of the control circuit: * **NC (95-96):** Wired in series with the contactor coil. It opens during a fault, cutting power to the motor. * **NO (97-98):** Closes during a fault, typically used to trigger a warning light or an alarm to a PLC. ### 4. Trip/Reset Button * **Red Button:** Used to manually test the trip mechanism. * **Blue/Reset Button:** Used to restore the relay to a functional state after a fault has been cleared and the strips have cooled down. --- ## Wiring Logic In a standard industrial setup, the relay is integrated as follows: ```mermaid graph LR Power[L1, L2, L3] --> Contactor[AC Contactor] Contactor --> Overload[JR16 Overload Relay] Overload --> Motor[Electric Motor] Control[115V Control Circuit] --- NC_Contact[NC 95-96] NC_Contact --- ContactorCoil[Contactor Coil] ``` ### Safety Note The **115V** designation in your model specifically refers to the auxiliary circuit compatibility. Ensure your control transformer provides 115V to match the logic signals of this specific unit. ---