22 mm diameter; 1NO + 1NC contact; straight type; double, two-color (red-green) button. Contact current 4 A / 250 V AC; insulation voltage 300 V; mechanical life ≥ 500,000 operations; electrical life ≥ 100,000 operations; protection class IP50; working temperature -15 ... +80 °C; contact material AgNi; Wimp 2.5 kV; dielectric strength ↔ 2.5 kV / 1.5 kV.