Most now use either IC's or microprocessors for function & time delay. Sometime in the seventies, manufacturers developed solid state time delay relays, originally using some type of RC (resistor-capacitor) circuit to set the time delay. In addition, they were only available in two functions: On Delay with Normally Open Timed Closed (N.O.T.C.) & Normally Closed Time Open (N.C.T.O.) contacts and Off Delay with Normally Open Timed Open (N.O.T.O.) & Normally Closed Time Closed (N.C.T.C.) contacts. Pneumatic time delay relays worked great, but they were normally very large & very expensive. What is the difference between an "Off Delay" & a "True Off Delay" time delay relay, and when is the True Off Delay function used? Solution/Resolution:
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