Used for switching inductive/capacitive loads up to 10A with 125VDC/250VAC hot switching and 400VDC/250VAC cold switching. X and Y connections are made via a 20-way GMCT plug, this module with loop-thru has an additional 20-way GMCT plug for module-to-module connection. This version of the 40-551 may be expanded to larger matrix sizes using cabling to daisy-chain the X and Y signals Power Matrix Modules are intended for switching heavy AC or DC loads or for slaving large external relays, contactors and solenoids. Suitable for applications requiring switching of either mains voltage or direct current.