The Model 334 and 364 Delayed One-Shot Timers are functionally interchangeable. The Model 334 is a DPDT potentiometer (knob-adjust) timer while the Model 364 is a DPDT, high-accuracy digital input timer. Solid-state timing circuits in each model drive an internal electromechanical relay. Upon application of power, the unit will start the OFF delay. After the OFF delay times out, the relay will energize for the ON time. When the ON time expires, the relay will de-energize and all timing will stop. Power must be removed and reapplied to begin timing again. An SG version of this model is available using silver with gold flash contacts. Models 334 and 364 are UL Recognized and CSA Certified.. Specifications: Certifications: CSA and UL; Contacts: DPDT; Mount: 8-Pin; Timing Range: 1 – 300 Sec.; Timer Function: Delayed One-Shot Timer; Voltage Range: 10-28VAC/VDC