CIRCUTOR DHB Series - Manual (Page 32)

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a) n-on b) n-off
c) on d) off
Fig. 12. Alarm types: a) n-on, b) n-off c) on d) off.
5.4.5. Alarm Types
The DHB-1xx meter is equipped with 2 alarm outputs with NOC contact
(make contact) and two alarm outputs with NOC/NCC contact (make
and break contact) (DHB-124). Each of alarms can work in one of the
six modes. The work of alarms in modes is presented in the fig. 12:
n-on, n-off, on, off. Two remaining modes: h-on and h-off mean suitably,
always switched on and always switched off. These modes are des-
tined for the manually simulation of alarm states.