The Magnetic Door Holder (CAS-R | MDH) enables fire doors to be held open by the Sertus Addressable Control System (CAS-R) for ease of access and as part of the Environmental Ventilation strategy. On receipt of a fire signal the 24V supply is immediately removed allowing the fire doors to close with the self-closing door device to provide the designed fire compartmentation.
The MDH is available as a floor mounted unit in a white ABS casing with a steel keeper plate to fit to the fire door. It has a holding force of 200N and incorporates a manual override release switch.
It is supplied with a Metal Oxide Varistor (MOV) surge protection device which should be installed within the MDH as shown on the schematic to protect the control system from power surges.
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