KTI Networks KCD-400 Series - Manual (Page 22)

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2.6 Power Failure Relay Output
The device provides a relay output to report power failure event to a
remote alarm monitoring system. The replay output is provided with two
contacts labeled PF+ and PF- in the terminal block interface.
Use the provided 2P terminal plug for signal wiring and plug into the PF+/
- contacts. The function is designed as :
Power is normal PF+ contact is shorted with PF- contact.
Power failure
PF+ contact is disconnected with PF- contact.
Note: Be sure the voltage applied on PF+/- contacts is within the
specification of 30VDC/1A max. or 120VAC/0.5A max.