Vertiv | NetSure 7100 Series -48V DC Power System Installation Manual (IM582127000) | Rev. BB
Installing Circuit Breakers and Fuses
Circuit breakers and/or fuses may have been factory installed for you. If so, verify their positions and sizes.
Installing Bullet Nose Type Fuseholders and TPS/TLS Fuses
CAUTION! 100 A circuit breakers and fuses can be used without a space provided the continuous
operating current in each 100 A device does not exceed 64 A. A 175 A or greater circuit breaker shall
have an empty mounting position between it and any other overcurrent protective device.
Refer to SAG582127000 for any other restrictions.
Refer to the following procedure and install bullet nose type fuseholders and appropriately sized TPS/TLS fuses
into the proper mounting positions in the distribution cabinet.
Procedure
NOTE!
Refer to
Figure 24
as this procedure is performed.
1. Open the distribution cabinet’s front door by turning the latch in the counterclockwise position
(system’s in a relay rack), or open the system’s enclosure door.
2. Orient the fuseholder as shown in Figure 24. Insert the terminals on the rear of the fuseholder into their
corresponding sockets on the distribution panel. Ensure the alarm contact on the back of the
fuseholder makes contact with the alarm terminal on the spring strip. Push fuseholder in firmly until fully
seated in the distribution panel.
3. When all fuseholders are installed, install an appropriately sized TPS/TLS fuse in each. To do this,
remove the fuse carrier from the mounted fuseholder body. Hold the fuseholder body while you pull the
fuse carrier from the body. Slide the fuse in place between the contacts of the fuse carrier. When done,
push the fuse carrier back into the fuseholder body. Note that a polarizing key on the bottom of the
carrier prevents the carrier from being inserted upside down.
4. Verify that an 18/100 ampere alarm fuse is present in each fuseholder and that a plastic safety cover is
installed on this fuse.
5. Record all fuse sizes on the label provided on the shield.
6. Close the distribution cabinet’s front door and turn the latch clockwise to secure the door (system’s in a
relay rack), or close the system’s enclosure door.
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