Available in one, four and eight channel versions, these modules can switch up to 10A per channel. Includes back-EMF (ElectroMagnetic Frequency) protection and LEDs so you can easily see the state of the outputs. The four and eight channel versions even have optical isolation to protect your main board. The one channel version operates directly from 5V. Features: Status LEDs show channel status Active High logic Screw terminals for easy connection to relay contact. SPDT Relays Current Ratings: 10A @ 250VAC 10A @ 30VDC Four mounting holes on each module Cat No. Channels Supply Voltage Optical Isolation Dimensions XC4419 1 5VDC NO 40(W) x 27(D) x 18(H)mm XC4440 4 12VDC YES 77(W) x 55(D) x 17(H)mm XC4418 8 12VDC YES 135(W) x 50(D) x 19(H)mm Specifications Width : 135mm Height : 19mm Depth : 50mm Packaged Volume : 0.31l Packaged Weight : 0.07kg Packaged Length : 12.9cm Packaged Width : 11cm Packaged Height : 2.2cm Required Supply Voltage : 12V