Electrified Accessories With an assortment of power supplies, timers, keypads, and switches, SARGENT electrified accessories give SARGENT electromechanical systems even greater flexibility of application use. 3520/3540/3550/3570 24VDC Power Supplies 3521/3541/3551/3571 12VDC Power Supplies Timer Model – TMR2 Multi-Function Timer Model – TMR9 Release Hold Timer Battery Packs 738 and 737 4291/4292 Keypads 3287 Door Status Switch 4370-4379 Cylinder Key Switches