The **GMC-63-R** is an AC magnetic contactor manufactured by LS Electric (formerly LG Industrial Systems). It is primarily used for switching power circuits, commonly found in industrial motor control applications. --- ## Technical Specifications The following table outlines the core electronic and mechanical parameters of the GMC-63-R: | Parameter | Specification | |:---|:---| | **Rated Current (AC-3)** | 63 Amperes | | **Rated Voltage (Ue)** | Up to 690V AC | | **Coil Voltage Options** | 24V, 110V, 220V, 380V, 440V AC (50/60Hz) | | **Number of Poles** | 3 Main Poles | | **Auxiliary Contacts** | Standard 2NO + 2NC (2 Normally Open + 2 Normally Closed) | | **Mechanical Life** | Approx. 12 million operations | | **Electrical Life** | Approx. 2 million operations | --- ## Core Electronic Components The device consists of several critical internal parts that facilitate high-current switching: ### 1. The Electromagnetic Coil The heart of the contactor. When the control voltage is applied to terminals **A1 and A2**, the coil creates a magnetic field. This field pulls the moving armature toward the stationary core. ### 2. Main Power Contacts Constructed from silver alloy to ensure high conductivity and resistance to "welding" (sticking) under high heat. These contacts close the circuit for the motor or load. ### 3. Auxiliary Contacts Lower-current contacts used for logic and feedback. These are used to: * Signal a PLC that the contactor is active. * Power an indicator light on a control panel. * Provide electrical interlocking to prevent short circuits in reversing starters. ### 4. Arc Chute / Extinguisher When the contacts open under load, an electric arc is formed. The GMC-63-R features arc dividers that stretch and cool the arc to prevent damage to the contacts and ensure safe circuit interruption. --- ## Installation and Wiring The unit is typically mounted on a **35mm DIN rail** or screw-mounted to a backplate. * **L1, L2, L3:** Line inputs (Power In). * **T1, T2, T3:** Load outputs (Power Out to Motor). * **A1, A2:** Control Coil terminals. * **13/14, 21/22, etc.:** Auxiliary contact terminals. ---