The AML21FBA2AB is a rectangular pushbutton switch housing from the AML21 series, featuring a single lamp circuit and a protective full guard bezel. It is configured with a 1-pole, double-throw alternate action (push-on, push-off) circuit that utilizes silver contacts. This model has a black bezel, is supplied with no lamp installed, and provides .110 x .020-inch solder or quick-connect terminals for electrical connection. As part of the UL recognized and CSA certified AML family, its independent lamp and switch circuits make it a versatile choice for control panels and instrumentation.