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ADCP-80-526 • Issue 6 • December 2006
Page 1
© 2006, ADC Telecommunications, Inc.
1 PRODUCT DESCRIPTION
This section describes the PowerWorx Select Series Fuse Platform.
1.1 Product Functions and Features
The Select Series Fuse Platform, shown on the front cover of this manual, supplies protected dc
power to the –24 Vdc or –48 Vdc equipment typically installed in a central office, multimedia
headend, remote site, Controlled Environmental Vault (CEV), or other restricted locations. The
fuse platform is available in a single or dual bus configuration and in several configurations of
fuse types. The fuse platform provides the following important features:
• 19-inch or 23-inch EIA or WECO rack mounting.
• Self-configuring input voltage capability to –24 Vdc or –48 Vdc.
• GMT, KLM, or TPA fuse types (with corresponding fuse holder modules) alone, or GMT
in combination with either of the other two types.
• “Upside down” GMT fuse holders making blown fuses easier to see.
• Optimally-positioned, high-brilliance fuse alarm (red LED) indicators, providing quick
identification of blown fuses.
• Field-replaceable high-brilliance power-on (green LED) indicators (one per bus).
• Easy-to-remove plastic protective covers for input and output terminals.
• Two-hole compression-lug terminals for input power connections.
• Two grounding studs for robust and reliable ground connectivity.
• Screw-down barrier terminal strips for power output connections.
• Relay contacts for alarm notification. The alarm contacts may be used to open or close a
loop connected from an external alarm system.
1.2 Fuse Platform Components
The Select Series Fuse Platform is a customer-configurable product containing either one or two
power buses. Each power bus is connected to multiple fuse holder modules. In a dual bus
platform, the two buses are mirror images of one another, having the same types of fuses and the
same size fuse holder modules. Figure 1 shows the external features of a typical fuse platform
(in this case, a dual bus fuse platform with four KLM and four GMT fuses per bus).
Note: KTK fuses will also fit in the KLM fuse holder, but are not currently rated for dc
voltages by Underwriters Laboratories (UL).
Warning: Use of one bus only on a dual bus panel will result in false alarms for the unused bus.
Power is required on both buses on a dual bus panel for normal operation.
Warning: In a fuse platform with KLM fuses, the KLM-fused output terminals will show –48
Vdc even when there is no load and no fuse in the fuse holder. This “phantom voltage” is
applied by the KLM circuitry alarm sensing function and will be less than 1 Amp.