Rockwell Automation 1503 IntelliVAC Contactor Control Module - Series C and later - Manual (Page 48)

Appendix
A
1503-UM052D-EN-P – June 2013
Typical Contactor Drop-out Time Settings
The contactor drop-out time settings shown in the following table are
typical minimum values used when the power fuses are provided as part of
a complete MV controller from Rockwell Automation. The
recommendations are based on Ferraz-Shawmut power fuses. Other fuse
types may require alternate drop-out time settings.
The IntelliVAC module DIP switches are set up to provide the minimum
drop-out times shown (refer to Chapter 4).
Table A.1 – Typical Contactor Drop-Out Time Settings
Fuse Rating Contactor Drop-out Time Setting (msec)
Voltage Designation 400A 800A
< 5000
2R
50
50
3R
4R
6R
9R
12R
18R
19R
24R 100
32R 240
38R ⊇
48X ⊇ 75
57X ⊇ 200
2 x 24R ⊇ 100
2 x 32R ⊇ 240 *
2 x 38R ⊇ ⊇
2 x 48X ⊇ ⊇
2 x 57X ⊇ ⊇
⊇ Fuse not suitable for use with contactor.
Note: The drop-out time is chosen to be equal to or greater than
the intersection of the rated contactor interrupting current and
the fuse melt time curve (except where noted * ).