Control of signal paths, LV dc and switching mains ac v, with delay for HV dc application in thermionic equipment.
~Terry B, Design Engineer, Wellington, Newe Zealand
I have seen them used in trigger circuits, isolation, UPS switching and monitoring.
~Christopher F, Engineer, Mysore, India
Switching highly inductive light and heavy loads with RC snubbers across them.
~Jim Rose, Design Engineer, Tucson, AZ
Traffic light system
Messages sign control
Parking lot control
Heater controls, RF power controls, isolation, motor control.
~LeRoy B, Research & Development, Aumsville, OR
Sequential turn on for computers and audio equipment.
~Gunnar H, Resource and development, Siglufjordur, Iceland
Windmill in building, solar panels, stirling engine
~Matti Niemi, Technical Specialist, VAASA, FINLAND
Espresso machines and water boilers
~Justin E, Technical Support, Melbourne, Australia
So far none other than teaching.
~Vijay S, Professor in Electrical engineering department, Hyderabad, India
For non inductive applications
~Technical Support/Services, Potosi, Bolivia
Low voltage motor starters.
~James H, Design Engineer, Hodgen, OK
Driving electric heat
~Marketing/Sales, St. Paul, MN
~Engineering, Design, Austin, TX
~Bob L, Engineer, Cape coral, FL
~Brent G, Research & Development, Melbourne, Australia
~Engineering, Consulting, Bengbu, China