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DPB1U & DPG1U SERIES
OPERATING MANUAL
P O W E R I N G T E C H N O L O G Y
Manual No. DPB-DPG-4
dpb_dpg-man-rev4-0317.indd
9.5
Form C Relay Contact Outputs.
The center of the back panel has connections to the
Form C relay contact outputs for connection to external audible or visual alarm circuits.
See Figure 8.
Alarm
Contacts
Alarm LEDs
B Input
¼-20 Studs
BAT
RTN
BAT
RTN
1 2 3 4 5 6 7 8 9 10
A
B
ALARM
Ground
8-32 Stud
A Side Breakers
B Side Breakers
A Outputs
6-32 Terminal Strip
B Outputs
6-32 Terminal Strip
A Input
¼-20 Studs
BAT
RTN
BAT
RTN
1 2 3 4 5 6 7 8 9 10
B SIDE A SIDE
NO-C-NC
NO-C-NC
5
6
3
1
2
OFF
O
ON
I
15
OFF
O
ON
I
15
OFF
O
ON
I
15
OFF
O
ON
I
15
OFF
O
ON
I
15
5
6
3
4
1
2
OFF
O
ON
I
15
OFF
O
ON
I
15
OFF
O
ON
I
15
OFF
O
ON
I
15
OFF
O
ON
I
15
OFF
O
ON
I
15
17.12 (434.9)
1.74
(44.2)
REAR VIEW
FRONT VIEW
Case depth: 8.94 (227.1)
2.28
(57.8)
Clear Perspex
Safety Cover
Figure 8. Alarm Contact & Ground Detail
Connection is made via two Phoenix Contact spring clamp terminal blocks. “B SIDE” is
for the Form C relay contact of side B and “A SIDE” is for the Form C relay contact of side
A. The terminals, viewed from left to right, are the normally open (NO) common (C) and
normally closed (NC) contacts, respectively. See table 5 below.
PIN
FUNCTION
CONTACT SCHEMATIC
NC
N.C. (normally closed)
RELAY
CONTACTS
OUTPUTS
N.C.
C
N.O.
C
C (common)
NO
N.O. (normally open)
Table 5. Alarm Relay Contacts
“Normally Closed” and “Normally Open” are defined with the distribution panel powered
and providing power to all outputs, i.e. no circuit breakers tripped AND when the input
power is connected to a side (A or B), the Form C relay of that side is energized. If there
is either loss of input power, one or more circuit breakers trip or the relay is de-energized,
the normally open contacts close and the normally closed contacts open. See table 6.
RELAY STATE MEANINGS
Relay State
Meaning
Energized (N.C. is closed)
OK
De-energized
(N.C. is open)
Breaker Trip
or
Breaker OFF
or
Fuse Blown
No Input Power
Table 6. Relay State Definitions
