Function
ProTrip™ Trip Units are designed with interchangeable
Rating Plugs. These Rating Plugs change the per-unit
(1
X
) continuous-current rating of the breaker. A circuit
breaker equipped with a suitable Trip Unit and Rating
Plug has a long-time trip current equal to the ampere
rating marked on the Rating Plug times the LT setting on
the Trip Unit.
For example, a breaker frame with a 1600 A sensor, an 800
A Rating Plug, and a long-time pickup switch setting of 1.0
has an 800 A continuous-current (long-time) rating.
Several Rating Plugs are available for each sensor rating
and each Rating Plug is keyed for a particular sensor
rating.
The catalog number structure for the available Rating
Plugs for ProTrip conversion kits is listed in Table 1. See
DEH–40034,
ProTrip™ Trip Units User’s Guide
, for a
complete listing of all Rating Plug catalog numbers.
Front Label
The front label, shown in Figure 1, is visible when the
Rating Plug is installed. The items listed are:
Sensor Rating (S) The ampere rating of the
corresponding breaker frame.
Rating Plug
The Rating Plug continuous
Amps (X)
current in amperes.
Test
The test-jack receptacle is used with
the Test Kit, catalog number
TVRMS2, for overcurrent and
ground-fault functional testing.
Catalog Number
Follows the format PTppCqqqqGFD,
as shown in Table 1.
Figure 1. Rating Plug with ground-fault function.
PT 20 C 700 GFD
Code
Description
Function
Code
Description
Function
1
150 A
80
80 A
225
225 A
100
100 A
4
400 A
125
125 A
6
600 A
150
150 A
8
800 A
Sensor
225
225 A
16
1600 A
250
250 A
20
2000 A
300
300 A
30
3000 A
400
400 A
32
3200 A
450
450 A
40
4000 A
500
500 A
600
600 A
Rating
700
700 A
800
800 A
GFD
Ground Fault
Ground Fault
1000
1000 A
Defeatable
1100
1100 A
1200
1200 A
1500
1500 A
1600
1600 A
2000
2000 A
2400
2400 A
2500
2500 A
3000
3000 A
3200
3200 A
3600
3600 A
4000
4000 A
Table 1. Rating Plug catalog number structure.
g
ProTrip™ Trip Unit Rating Plugs
ProTrip™ Conversion Kits
DEH–40054