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ES42 Series Edge Switches Installation and User Guide (05/05)
4.4 Hardware operated Alarm Contact for monitoring internal power supply
The two screws Alarm Contacts feature, standard on Magnum ES42H and P,
provides Normally Closed (NC) contacts to which the user can attach one sets of status
monitoring wires at the green terminal block. When this option is present, the terminal
block for Alarm Contacts is part of the Power Input panel in the Magnum ES42s case. The
DC power input connection is in the same panel.
The NC Alarm Contact is held close
when there is power on the main board inside of the
ES42. This provides a “Hardware operated Alarm”
because the NC contacts will open when internal
power is lost, either from an external power down
condition or by the failure of the power supply inside
of the Magnum ES42 Switch.
Useful info about Alarm Contacts in
ES42H and ES42P:
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