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ADCP-80-575 • Issue 2 • December 2006
Page 6
© 2006, ADC Telecommunications, Inc.
1.5 Accessories
The following accessories are available for the fuse platform:
• Standard size GMT, KLM, and TPA type fuses
• GMT colored fuse-value designation pins (rivets)
• Cable management bar kits
• GMT fuse pullers
• Two-hole compression connector lugs for input power connections
• Lug terminals to connect #10 AWG wire to earth ground
• GMT fuse value designation pin holders
• Fuse value designation card holder kits
1.6 Mounting
The fuse platform can be mounted in a 19-inch (48.26 cm) or a 23-inch (58.42 cm) equipment
rack. Two pairs of mounting brackets, one pair for 19-inch racks and one pair for 23-inch racks,
are provided with the fuse platform. The fuse platform can be flush mounted or recessed 1, 2, 3,
or 4 inches (2.54, 5.08, 7.62 or 10.16 cm) from the front of the rack. The mounting brackets
allow mounting in racks with WECO 1.00-inch (2.54 cm) hole spacing or EIA 1.25-inch (3.18
cm) hole spacing. The slotted hole pattern in the mounting brackets compensates for vertical
rack differences and allows the fuse platform to be mounted in either 1.75- or 2-inch (4.45 or
5.08 cm) rack spaces.
1.7 Power Buses
The fuse platform is available with one or two separate power buses. Each bus distributes the
input power to multiple fused output circuits. In each bus circuit, current flows from the input
connector to the fuse bus. When a fuse is installed in a fuse holder, the circuit is completed to
the corresponding output connector. Figure 3 provides a block diagram of the power buses in a
typical fuse platform (dual bus model shown).
Fuse failure is sensed by a sensor which causes the alarm monitor to light a red LED indicator
on the front of the fuse holder. The function of the fuse failure indicator differs depending on
fuse type as follows:
• For GMT fuses, there is a red LED indicator for each set of fuses (depending on product
configuration, each fuse holder holds four or ten fuses). Fuse failure also opens and closes
a set of alarm contacts (form C dry contacts) connected to the alarm output terminals.
There is one such set of alarm contacts for each bus, with failure of any fuse on the bus
causing an alarm condition.
• For TPA fuses, there is an individual red LED indicator for each individual fuse because
each fuse holder holds a single fuse.
• For KLM fuses, there is an individual two-color indicator (green/red LED) for each fuse.
The indicator functions as follows: