Monitors the MX Loop line condition for short circuits and provides connection/isolation using solid state switches
A spur circuit is connected between the input and output switches for connection convenience
A fault on either the input (Left side) wiring or the output (Right side) wiring opens that switch allowing the spur to continue to operate for loop circuits wired Class A, and also isolates the shorted wiring section from the functioning section
A fault on the spur circuit opens both switches separating the spur from the rest of the communications loop
