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15Smart-UPS® VT and MGE™ Galaxy™ 3500 10-30 kVA 208 V MBP Installation
Appendix A: Changing Fuses
Warning: Before changing fuses, make sure ALL MBP switches are in the OFF
position. From normal operation, first switch Q2 OFF, and then switch Q1 OFF.
Note: Replace ALL blown fuses with Bussmann “Class J” 90 Amp fuses (p/n JKS-90).
Removing fuses
1. Open the front door of the MBP to access the fuse block. Use the enclosed front door keys.
2. Using a plastic or insulated fuse puller, tightly grasp the center section of the blown fuse.
3. Pull the fuse toward you, forcing its release from the two sets of spring clasps.
Replacing fuses
1. Using a plastic or insulated fuse puller, tightly grasp the center portion of the replacement fuse.
2. Align the fuse’s metallic ends with the two sets of spring clasps that will hold it in place.
3. Push the fuse into the two sets of clasps until the clasps snap around the metallic ends.
4. Close and lock the front door.
Note: After changing fuses, the MBP can be returned to normal operation by first switching
Q2 ON, and then switching Q1 ON. Q3 remains OFF.
Fuse Puller
90A Fuse
Spring Clasps (top and bottom)
Metallic End (top and bottom)
Fuse Block