IEC-715 is designed to monitor its primary video input signal and automatically switch to an auxiliary video input with the loss of the primary video signal. A captive screw terminal sub-module is provided for audio-follow-video capability for mono or stereo audio switching. A three-terminal screw block provides dry contacts for normally open (NO) and normally closed (NC) to control peripheral gear. The IEC-715 can mount in a one rack unit frame that holds up to three 700 series units. Engineered with the user in mind, the IEC-715 has several important features built in. A unique noise immunity circuit that prevents the video detector from being fooled by high level noise on its input is incorporated in the IEC-715. A relay provides a hard by-pass of the primary video signal in the event AC power is lost to the unit. Front panel by-pass and aux select switches allows to override the automatic change-over function and choose either video source. A front panel status LED indicates the condition of the primary video input. Packaged in an attractive 700 series stand-alone chassis, the IEC-715 provides both reliability and flexibility.