The 3SB3500-0DA21 is a pushbutton switch manufactured by Siemens. It is a 22 mm wide flush-mounted device with a single-pole, double-throw handle. The switch is rated for 600 V AC, 3 A. It has a black plastic enclosure with standard and illuminated versions available. The illuminated version has a green LED light at the back to indicate ON status. It is suitable for a variety of applications such as emergency stop, switching on/off, selecting between two states and so on. Its mechanical life is rated at 500,000 cycles. It also has UL, CSA and EAC approval and meets the requirements of IEC EN60947-5-1 and IEC EN60947-5-1/VDE 0660.