Multi-purpose passive switching device

摘要

A switching device has a housing containing a magnetic latching relay that operates a set of contacts to respective closed and open conditions. Plural terminals provide for connection of the switching device with controlling circuitry that operates the relay and with controlled circuitry that utilizes the condition of the set of contacts for a control purpose. A thin-line fuse separably mounts on the exterior of the switching device to form a series circuit with the set of contacts between a pair of the terminals that provide connection with the controlled circuitry. The controlling circuitry provides pulse signals to other terminals to operate the relay. The housing further contains a capacitor and LED connected in parallel with the fuse and in series with a resistor so that the LED lights when the fuse is removed or blown. A mechanical override having an external actuator can operate the contacts in the event that they are not operated by the controlling circuitry operating the latching relay.