Remove and Install the Control Transformer Fuses (FH4...FH7) for Frames 8...15

Replace the control transformer fuses (labeled FH4…FH7) with the appropriate kit catalog number that is identified in these tables.
IMPORTANT: Control transformer fuse quantities vary based on the product voltage class and IP rating. It is recommended that you replace all control transformer fuses.
Frame 8 Fuses
Kit Cat. No.
Fuse Quantity in Kit
Voltage Class
Fuse Amp Rating
Enclosure IP Rating
Fuse Quantity Required
SK-RM-IBFH4-FUSE4A-F8
2
400V/480V/600V
20
IP21
2
SK-RM-IBFH4-FUSE4B-F8
2
690V
16
IP21
2
SK-RM-IBFH4-FUSE4C-F8
2
400V/480V/600V
30
IP54
2
SK-RM-IBFH4-FUSE4D-F8
2
690V
20
IP54
2
Frame 9 Fuses
Kit Cat. No.
Fuse Quantity in Kit
Voltage Class
Fuse Amp Rating
Enclosure IP Rating
Fuse Quantity Required
SK-RM-IBFH4-FUSE4C-F8
2
400V/480V/600V
30
IP21
2
SK-RM-IBFH4-FUSE4D-F8
2
690V
20
IP21
2
SK-RM-IBFH4-FUSE4F-F9
4
400V/480V/600V
30
IP54
4
SK-RM-IBFH4-FUSE4H-F9
4
690V
20
IP54
4
Frame 10 Fuses
Kit Cat. No.
Fuse Quantity in Kit
Voltage Class
Fuse Amp Rating
Enclosure IP Rating
Fuse Quantity Required
SK-RM-IBFH4-FUSE4F-F9
4
400V/480V/600V
30
IP21
4
SK-RM-IBFH4-FUSE4H-F9
4
690V
20
IP21
4
SK-RM-IBFH4-FUSE4J-F11
6
400V/480V/600V
30
IP54
6
SK-RM-IBFH4-FUSE4K-F11
6
690V
20
IP54
6
Frame 11 Fuses
Kit Cat. No.
Fuse Quantity in Kit
Voltage Class
Fuse Amp Rating
Enclosure IP Rating
Fuse Quantity Required
SK-RM-IBFH4-FUSE4F-F9
4
400V/480V/600V
30
IP21
4
SK-RM-IBFH4-FUSE4H-F9
4
690V
20
IP21
4
SK-RM-IBFH4-FUSE4J-F11
6
400V/480V
30
IP54
6
SK-RM-IBFH4-FUSE4A-F8
6
600V
20
IP54
6
SK-RM-IBFH4-FUSE4K-F11
6
690V
20
IP54
6
Frame 12 Fuses
Kit Cat. No.
Fuse Quantity in Kit
Voltage Class
Fuse Amp Rating
Enclosure IP Rating
Fuse Quantity Required
SK-RM-IBFH4-FUSE4J-F11
6
400V/480V
30
IP21
6
SK-RM-IBFH4-FUSE4A-F8
2
600V
20
IP21
6
SK-RM-IBFH4-FUSE4K-F11
6
690V
20
IP21
6
SK-RM-IBFH4-FUSE4F-F9
2
400V/480V
30
IP54
8
SK-RM-IBFH4-FUSE4A-F8
2
600V
20
IP54
8
SK-RM-IBFH4-FUSE4M-F12
8
690V
20
IP54
8
Frame 13 Fuses
Kit Cat. No.
Fuse Quantity in Kit
Voltage Class
Fuse Amp Rating
Enclosure IP Rating
Fuse Quantity Required
SK-RM-IBFH4-FUSE4F-F9
4
400V/480V/600V
30
IP21
8
SK-RM-IBFH4-FUSE4H-F9
4
690V
20
IP21
8
SK-RM-IBFH4-FUSE4J-F11
6
400V/480V
30
IP54
12
SK-RM-IBFH4-FUSE4A-F8
2
600V
20
IP54
12
SK-RM-IBFH4-FUSE4K-F11
6
690V
20
IP54
12
Frame 14 Fuses
Kit Cat. No.
Fuse Quantity in Kit
Voltage Class
Fuse Amp Rating
Enclosure IP Rating
Fuse Quantity Required
SK-RM-IBFH4-FUSE4F-F9
4
400V/480V/600V
30
IP21
8
SK-RM-IBFH4-FUSE4H-F9
4
690V
20
IP21
8
SK-RM-IBFH4-FUSE4J-F11
6
400V/480V
30
IP54
12
SK-RM-IBFH4-FUSE4A-F8
2
600V
20
IP54
12
SK-RM-IBFH4-FUSE4K-F11
6
690V
20
IP54
12
Frame 15 Fuses
Kit Cat. No.
Fuse Quantity in Kit
Voltage Class
Fuse Amp Rating
Enclosure IP Rating
Fuse Quantity Required
SK-RM-IBFH4-FUSE4J-F11
6
400V/480V
30
IP21
12
SK-RM-IBFH4-FUSE4A-F8
2
600V
20
IP21
12
SK-RM-IBFH4-FUSE4K-F11
6
690V
20
IP21
12
SK-RM-IBFH4-FUSE4J-F11
6
400V/480V
30
IP54
16
SK-RM-IBFH4-FUSE4A-F8
2
600V
20
IP54
16
SK-RM-IBFH4-FUSE4M-F12
8
690V
20
IP54
16
For frame 8, the control transformer fuse holders (labeled FH4) are located in the AC precharge module in the input bay. For frames 9…15, the fuse holders (labeled FH4…FH7) are on the control panel in the input bay. Follow these steps to remove and replace the control transformer fuses.
  1. Review the product advisories in Before You Begin.
  2. Remove power from the system.
  3. Open the enclosure door.
  4. Remove the guard from the enclosure.
  5. Pull out on the tabs at the top of the fuse holder and remove the fuse.
    example of how to remove the control transformer (FH4) fuses from an input bay
  6. Install the control transformer fuses in the reverse order of removal.
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