Ex installation switch 16 A for zone 1/21, changeover switch, housing holes: 2 x M20, direct housing hole, cable entries/housing holes: 2 x M20 thread, housing material: polyamide, rated voltage: 250 V, rated current: 16 A, marking according to 94/9/EC: Ex II 2 G Ex de IIC T6 / Ex II 2 D Ex tD A21 IP66 T 80 °C, EC type examination certificate: PTB 98 ATEX 3121, permissible ambient temperature: -20 °C to 40 °C, dimensions (L x W x H): 85 x 85 x 64 mm, weight: 0.3 kg, protection class: I, protection class: I, protection type according to EN 60529: IP66,