Ex coupling for zone 1/21, 16 A, 5-pin, 346-415 V, 6 h, cable entries: 1, polyamide, cable entries/housing holes: Ø 12 - 21 mm, housing material: polyamide, rated voltage: 500 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): 279 x 90 x 90 mm, weight: 1.7 kg, protection class: I, protection type according to EN 60529: IP66,