Ex wall socket for zone 1/21, 16 A, 3-pin, 42 V, 12 h, cable entries: 1 x M25, polyamide, cable entries/housing holes: 1 x M25 Ø 8 - 17 mm, 1 x M25 Ex screw cap plastic (bottom) or 2 x metal thread M20 with screw cap plastic, housing material: glass fiber reinforced polyester, polyamide, rated voltage: 50 V AC, frequency: up to 400 Hz, rated current: 16 A, marking according to 94/9/EC: Ex II 2 G Ex ed IIC T6 / Ex II 2 D Ex tD A21 IP66 T80 °C, EC type examination certificate: wall socket, plug and coupling: PTB 99 ATEX 1039, permissible ambient temperature: -20 °C to 40 °C, dimensions (L x W x H): 223 x 90 x 121 mm, Weight: 1.2 kg, Protection class: I, Protection type according to EN 60529: IP66,