The sort of switch that stays off if the power fails is a No-Voltage-Reset or NVR. The On button puts power to the relay coil and a relay contact holds it. When the power to this hold circuit goes, the relay drops out and is only latched back on by the ON button. Having a push-to-break switch in the hold circuit gives you an OFF switch.
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You can make an NVR switch with a relay or contactor with extra (to the main switching requirement) contacts. Some contactors have auxiliary contacts to do this or other things.
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My whole workshop is Contactor NVR controlled, so if I am back in the house I can push the remote off button when I hear the compressor start up, without having to go back there.
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Cheers,
Rob