... voltage: 12VDC~24VDC 3.ISO9001:2008 Fail Safe Electric Bolt Locks / Electric Drop Bolt 12/24VDC 1.Type: fail safe (unlock when power ... by power fails 0S,3S,6S,9S are available open lock by access control system 3S,6S,9S,15S are available ... alloy 6.The length of extension bolt is 15mm 7.Shake-proof,Anti-theft:The lock can increase current to keep the ...