1High insulation voltage is AC 660V and the rated voltage is 440V. 2With 2 positions of contact,the switch can be used in more areas. 3The switch works stable and very practical in use. 4Long service life.The mechanical life is 5000000 times and electrical life is 500000 times. 5This button is suitable for action control in AC 50Hz, voltage 380V and below, DC 220V and below electromagnetic starters, contactors, relays and other electrical circuits. Features: High insulation voltage is AC 660V and the rated voltage is 440V. With 2 positions of contact,the switch can be used in more areas. The switch works stable and very practical in use. Long service life.The mechanical life is 5000000 times and electrical life is 500000 times. This button is suitable for action control in AC 50Hz, voltage 380V and below, DC 220V and below electromagnetic starters, contactors, relays and other electrical circuits. Specification: Model: BEM38-11DS(LA38) Color:Red/Yellow/Blue/Green(Optional) Indication Light Voltage:AC220V Rated Voltage: 440V Ui: AC660V Working Current: 10A Function:Self-Locking Button Contact Type:1 on 1 off Hole Diameter: 22mm/0.87in Rated Heat Current: 15A Contact Material:Silver Alloy Contact Resistance: 50ohm Insulation Resistance: 50Mohm Mechanical Life:5000000 times Electronic Life:500000 times Size:82 x 35 x 29mm / 3.23 x 1.38 x 1.14in Package List: 10 x Button Switch