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“M550C”function: Open force monitor and auto-switch current draw / holding force structure;

TVS+4x MOV compose tow levels protective circle;

       12-24 Voltage auto-adapted, auto-alarm when input voltage exceeding tolerance；

       Waterproof;

Body Size: L x H x D=216mm x 41mm x 63 mm

Suitable door thickness : 35mm-55mm  (wooden、metal door, single door, surface mounting）

Environment request:  Indoor, Temperature : -15°C～60°C,  Humidity : 0～95%

Durability cycle test: holding and functioned well after 1,000,000 cycles

Performance test：

Holding force: 450-500kg （1200 lbs.）
Current draw: 240-420mA 

Dielectric voltage withstand test：500V@1 minute，creepage current less than 1mA;

Over voltage test: input voltage over standard 25%，performance well @ 24H；

Under voltage test：input 85% standard voltage，holding force not reduce more than 15％；

Temperature rise test：power on to hold @24H, max temperature rising less than 20°C;

Surface Salt spray test：10 degree @ 24H, neutral