The FEM4000HST is an Electro Magnetic Lock from FSH. The Electro Magnetic Lock FEM4000HST has an electronically addressable armature plate, unique to each magnet and has a holding force of up to 580kg. The device has up to 4 hour fire resistance rating tested to both Australian and British Fire Test Standards. The device is provided with built in surge protection and accepts both 12 and 24VDC. This Electro Magnetic Lock also provides the following monitoring features: Lock Status Sensor by Hall-Effect (LSS) Internal CPU registered armature plate The Electro Magnetic Lock FEM4000HST is supplied with an Anti-Tamper-Plate as standard, to prevent hostile attacks on the dome-nut-fixing bolt of the Armature Plate. The device is S.C.E.C. approved for "Secure Areas."