Rockwell Automation 1503 IntelliVAC Contactor Control Module - Series C and later - Manual (Page 19)

3-6 Installation and Wiring
1503-UM052D-EN-P – June 2013
Fuse Protection The IntelliVAC module requires external fuse protection to coordinate
with the power supply and contactor. The fuse ratings shown in Table
3.A allow the passage of inrush currents expected when the contactor is
closed, or from recommended external capacitors for the TDUV option.
They will also protect the contactor coils in the event of a module
malfunction.
The recommended fuses have been tested to ensure reliable protection of
the module. If the supply voltage is DC, the module must be used with an
external fuse that is approved for and rated to interrupt the DC voltage
supply. The types listed are Ferraz-Shawmut Midget Fuses (1-1/2" X
13/32"). The TRM is a time-delay type, rated 250 VAC. The ATM is a
fast-acting type, rated 500 VDC.
Table 3.A – IntelliVAC Fuse Protection
Rated Supply Voltage Contactor Type
Recommended Fuse
(minimum) (maximum)
110/120 VAC
400A EH TRM 2 TRM 3.2
800A EH TRM 2 TRM 6.25
400/800A ML TRM 2 TRM 3.2
220/240 VAC
400A EH TRM 2 TRM 6.25
800A EH TRM 2 TRM 6.25
400/800A ML TRM 2 TRM 6.25
125 VDC
400A EH/ML ATM 3 ATM 3
800A EH/ML ATM 5 ATM 6
250 VDC
400A EH/ML ATM 3 ATM 5
800A EH/ML ATM 5 ATM 6
EH = Electrically Held vacuum contactor
ML = Mechanical Latch vacuum contactor
Note: If external capacitors are connected, or more than one
IntelliVAC module is protected by a common control fuse, the
maximum recommended fuse should be used to prevent fuse
opening due to increased inrush current when control power is
applied.
Grounding
The IntelliVAC module must be connected to a common ground
terminal (PE) on the controller panel. The ground terminal is located on
the bottom of module enclosure (refer to Figure 3.4).
A T T E N T I O N A T T E N T I O N
It is important that IntelliVAC is properly
grounded using the ground connection
provided. Failure to do so may result in damage
to equipment or personal injury.