The Model 333 and 363 Instant & Operate Delay Timers are industrial quality devices with a high accuracy electronic timing circuit driving two internal SPDT relays. One relay transfers upon application of power, the other relay transfers after a delay period. Each model is functionally interchangeable and available in multiple voltage/timing range combinations. The Model 333 is a potentiometer (knob-adjust) timer and the Model 363 is a high-accuracy digital input timer. An SG version of this model is available using silver with gold flash contacts.

Models 333 and 363 are UL Recognized and CSA Certified.