A Contactor Is An Electrically Controlled Switch Used For Switching An Electrical Power Circuit, Similar To A Relay Except With Higher Current Ratings And A Few Other Differences.Relays Are Used Where It Is Necessary To Control A Circuit By A Separate Low-Power Signal, Or Where Several Circuits Must Be Controlled By One Signal. A Type Of Relay That Can Handle The High Power Required To Directly Control An Electric Motor Or Other Loads Is Called A Contactor. SKU:3Th30400Bc4 Product Features: 3Th30400Bc4 – 10A Size-0 Coil-30V Dc 4No+Add Sicont+Contactor Rely