Hybrid power
relay used for opening or closing electrical circuits, including an electrical contact having a mechanical movement, a
semiconductor component in parallel with the electrical contact, and a
control unit which in response to a logic input level causes the electrical contact to close (open) and the
semiconductor component to be turned on. The
control unit generates a contact-make
signal for closing the contact, and a
control signal that turn on the
semiconductor component for a predetermined period of time. The
control signal prevents the semiconductor component from being turned on after the predetermined period if the electrical contact fails to close so that the semiconductor component is undamaged. Also, the
control unit generates a contact-break
signal for opening the electrical contact, and turning on the semiconductor component before the electrical contact has opened by means of a
control signal which terminates at the end of a second predetermined period after the electrical contact has opened.