NC lock = Normally ClosedNo power →  unlockedPower ON →  locksNC = Needs power to stay closedSuperier low temperature designLower power consumption, Enviromental protectionDoor status signal output contact (NC/COM or NO/COM)Superior Strength Aluminium Alloy, Solid Stain-less Steel BoltLong Life  with 500000 OperationsSafe & durableWorking Measure: power-on to lock, power-off to unlockSuitable for: Wooden Door,Glass Door,Metal Door,Fire Proof DoorInput Voltage: DC12VWorking Current: 900mA; Static Current: 120mA.Working Measure: Fail safe, Locked when energized(ZDL-210NC).Fail-safe type: Power to lockCoil type: Continuous workingSolid Bolt: polishing housing, 800Kg Holding ForceInduction Distance : 8mmProduct Size : 205Lx30WX38H(mm)Weight : 0.95KgsOperating temp : -10~+25℃（14-131F）Operating Humidity : 0~90%Face place material ：High Aluminum, Carrulous Line Finished