On-off switch with time delay

A switch for an electrical circuit, said switch comprising:

• a common terminal adapted for connection to said circuit;
• selective switching means connected to said common terminal;
• at least first and second position contacts for selective engagement by said switching means, said first position contact being adapted for connecting to said circuit whereby upon engagement by said switching means a closed-circuit on condition can be provided;
• and a positive-temperature-coefficient thermistor connected between said second and first position contacts whereby, upon connection of said switch in said circuit and engagement of said second position contact by said switching means, said thermistor is series connected with said switch in said circuit;
• said thermistor being selected to delay deenergization of said circuit for a predetermined period of time upon actuation of said switching means from said first to said second position contact whereby a time delayed off function is provided.