The EX1200-5004 is a high-density 5 A switch module designed for switching applications such as process control, appliance pass/fail testing, and on/off control. Up to 192 individual SPDT relays can be accommodated in a 1U full-rack mainframe for maximum density. Since the EX1200-5004 is typically used to switch power to the device under test or interface panel, it will respond to a fail-safe interrupt signal provided through the EX1200 system general purpose digital I/O. By programming this module as a ‘listener’ to a fail-safe input, all relays can be forced to automatically open to instantly remove power from the UUT or interface in the event of an external fault condition.