C3911BA is a single pole metal toggle switch featuring an ON-ON momentary one side switching function. It is part of the 3900 series metal toggle switches with ratings up to 16(4)A 250Vac T85 and features a 17.5mm metal nickel-plated actuator with a single pole A body configuration. The switch utilizes 6.3 x 0.8mm terminals and has a mounting thread of 15/32" x 32TPI with keyway for secure panel installation. This toggle switch is RoHS compliant and carries UL/CSA approvals, making it suitable for industrial control panels, machinery, and equipment requiring reliable momentary switching action.