Push-button Switch Dimensions ? x H: 18 x 37.5 mm Temperature range: -20 ... +70 °C LED: 24 VDC Contact material: Silver Contacts: 1 Change-Over (CO) Housing Material: Brass (CuZn) / Nickel-Plated Illumination: Yes Light colour: Ring / Blue Protection rating: IP67 Switching type: Momentary Function Flush-mounted ?: 16.5 mm Illumination Supply Voltage: 24 VDC Rated voltage: 250 VAC