Optimum 24 Hour Socket Box Timer OP-SBSTOptimum 24 Hour Socket Box Timer OP SBST The Optimum 24 Hour Socket Box Timer is a General purpose timeswitch for mounting directly over a flush or surface mounted 13 amp socket box. Features Designed to mount directly over a single pattress 24 Hour programming 15 Minute tappet intervals 16 Amp resistive, 8 Amp inductive Captive tappets; Timed OFF Constant selection Volt free SPDT contacts Not suitable for discharge or LED lighting without a contactor