Terminal markings:
Top row, left: 1.2 x 9.6 mm AC symbol
Top row, right: 1.2 x 9.6 mm +B
Middle row: 0.8 x 6.4 mm AC symbol
Middle row: 0.8 x 6.4 mm AC symbol
Middle row: 0.6 x 4.8 mm W
Middle row: 0.8 x 6.4 mm Key symbol
Bottom row: 0.6 x 4.8 mm Lamp symbol