ratings: 48V AC / 500mA max.mounting hole: 19mmoperating temperature: -25°C ~ +55°C , operating humidity: 45 ~ 85% RHinsulation resistance: > 100M ohms , contact resistance: < 50M ohmscontact material: silver alloy ,24VDC / 1A , 230VAC / 0.5Amechanical life: 1 000 000 cycles , electrical life: 50 000 cyclesIP rating: IP40/IP65