Vertiv | +24 VDC Power System User Manual (Section 6013) | Rev. G
Replacing a TPH-Type Fuse
NOTE!
Applies only if power system is equipped with TPH-type fuses.
Defective TPH-type fuses are replaced by opening the fuseholder and replacing the defective fuse.
Replace also the alarm fuse associated to this fuse as previously explained.
Refer to SAG581126000 for part numbers.
When required, use the List 79 capacitor Pre-charge Assembly to initially charge DC load capacitors prior to
installing a distribution fuse. A clip cord is provided for connecting to the circuit breaker or fuseholder
terminals. For operating information, refer to the Pre-Charge Assembly instructions (Section 5823). These
instructions are provided in the document set furnished with your system.
Procedure
NOTE!
Refer to
Figure 24
as this procedure is performed.
1. Remove the fuse carrier from the fuseholder body by grasping its handle and pulling straight out.
2. Remove the fuse from the fuse carrier.
3. Replace the open fuse with the same type and rating, or equivalent. Install the fuse into the fuse carrier.
When done, push the fuse carrier securely back into the fuseholder body.
4. On the distribution row, locate the open alarm fuse associated with the TPH-type fuse being replaced.
Replace the alarm fuse with a Bussmann GMT 1/4 ampere alarm fuse. Part No. 248610200.
5. Safety fuse covers are provided for all Bussmann GMT type fuses. These covers snap onto the fuses
and provide protection from exposed live contacts when a fuse opens. Re-install the safety fuse cover
after replacing any GMT type fuse. Refer to Figure 22 for safety fuse cover installation details.
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