Definition of protection devices at the start of a line
(Original Document)
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Introduction
You are advised to mount a protection device, such as circuit breaker or fuse, at the start of the line on the supply network.
The following information can be used to define the minimum amperage rating of the circuit breaker or fuse for a given power supply module.
Selecting a line circuit breaker
To select the amperage of the circuit breaker, the following three characteristics, which are given for each supply module, must be taken into account:
The minimum amperage for the circuit breaker should be selected as follows:
Illustration: characteristics provided by the circuit breaker manufacturer.
Selecting the line fuse
When selecting the amperage rating of the line fuse, the two following characteristics, which are given for each power supply, must be taken into account:
The minimum amperage rating for the fuse is selected as follows:
The characteristics of I rms, signal I, It and I2t for each power supply module are:
TSX module
PSY 2600
PSY 5500
PSY 8500
PSY 1610
PSY 3610
PSY 5520
I rms
at 24VDC
-
-
-
1.5 A
2.7 A
3A
at 48VDC
-
-
-
-
-
1.5 A
at 100VAC
0.5 A
1.7 A
1.4 A
-
-
-
at 24VAC
0.3 A
0.5 A
0.5 A
-
-
-
I signal(1)
at 24VDC
-
-
-
100 A
150 A
15 A
at 48VDC
-
-
-
-
-
15 A
at 100VAC
37 A
38 A
30 A
-
-
-
at 24VAC
75 A
38 A
60 A
-
-
-
It
at 24VDC
-
-
-
0.1 As
0.3 As
0.25 As
at 48VDC
-
-
-
-
-
15 As
at 100VAC
0.034 As
0.11 As
0.15 As
-
-
-
at 24VAC
0.067 As
0.11 As
0.15 As
-
-
-
I2t
at 24VDC
-
-
-
6 A2s
26 A2s
2.2 A2s
at 48VDC
-
-
-
-
-
1.8 A2s
at 100VAC
0.63 A2s
4 A2s
15 A2s
-
-
-
at 24VAC
2.6 A2s
2 A2s
8 A2s
-
-
-
(1) Values at initial power-up and at 25°C.