Ex main current switch changeover switch 20 A for Zone 1/21, 3-pole, auxiliary contact: 2S, cable entries: 3 x M32 + 1 x M25, polyamide, cable entries/housing holes: 3 x cable entry M32 for Ø 12 mm - 21 mm, 1 x cable entry M25 for Ø 8 mm - 17 mm, housing material: glass fiber reinforced polyamide, rated voltage: up to max. 690 V, frequency: 50 - 60 Hz, rated current: max. 20 A, marking according to 94/9/EC: Ex II 2 G Ex ed ia IIC T6 / Ex II 2 D Ex tD A21 IP66 T80 °C, EC type examination certificate: PTB 99 ATEX 1161, permissible ambient temperature: -20 °C to 40 °C, dimensions (L x W x H): 271 x 120 x 197 mm, weight: 2.5 kg, protection class: I, protection type according to EN 60529: IP66, connection terminals main contact: 2 x 4 qmm,