Test Switch - Series 26 Shallco’s Test Switch – Series 26, meets requirements for 1 – 25 Amperes switching of resistive loads to .75 power factor at voltages to 600V AC and 250V DC resistive loads. Test Switch - Series 26 Click Here for Drawing Test Switch, 4 Deck Version - Series 26 Click Here for Drawing Request A Quote Return to 30 Amp Detented Power Switches