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FEATURES
 Compatible with +24V, +48V, -24V or -48V dc input voltages (battery voltages).
 3-½ Digit LED display indicating Voltage/Current for either bus.
 2 busses per panel (120 Amps/bus maximum).
 5 GMT style fuses per bus (20 Amp GMT fuse max, 50 Amps per GMT bus max).
 4 TPA style fuses per bus (50 Amp TPA fuse max, 120 Amps per TPA bus max).
 Normal and Alarm LEDs for Bus A and Bus B indicate power or fuse failure.
 Two sets of "Form C" relay contacts extend alarm conditions for each bus.
 Brackets supplied are reversible for both 19" and 23" racks, with flush and offset mounting options.
 High current 1/4" stud inputs (1/4"studs on 5/8" centers) for up to 120 Amps/input.
 Offset terminal blocks with rear shield provided (standard).
 UL Listed
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Westell
Fuse Panel
Technical Practice
NPTPA1123
4/4 TPA + 5/5 GMT with Voltage/Current Readout
030-101788 REV D
1123-03D
July 2, 2013

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Summary of Contents for Westell NPTPA1123

  • Page 1 July 2, 2013 Westell Fuse Panel Technical Practice NPTPA1123 4/4 TPA + 5/5 GMT with Voltage/Current Readout FEATURES  Compatible with +24V, +48V, -24V or -48V dc input voltages (battery voltages).  3-½ Digit LED display indicating Voltage/Current for either bus.
  • Page 2: General Description

    2. APPLICATION panel. A designation card is provided for keeping 2.1. The NPTPA1123 Fuse Panel is designed records of which position is connected to which to be used in the rack level distribution of DC equipment and what amperage is to be used.
  • Page 3: Installation

    thru 9. The TPA fuses are numbered 1 thru 4 Rack Mount Instructions: Elevated Operating Ambient - For closed or for bus A and bus B. multi-unit rack assemblies, the operating ambient may be greater than room ambient. Take care to 3.3.
  • Page 4 4.4. Remove the distribution fuse feeding the 4.8. Chassis Ground; For safety reasons, and input cables that are to be connected to the new as recommended by NEBS, the chassis should be panel. Attach the input cables to the input electrically connected to the rack ground.
  • Page 5 Amps Color Code 18/100 A Yellow 2/10 A Red/Black 1/4 A Violet 3/8 A Gray/White 1/2 A 65/100 A Black 3/4 A Brown Gray 1 1/3 A White 1 1/2 A White/Yellow Orange 2 1/2 A White/Orange Blue 3 1/2 A White/Blue White/Brown Green...
  • Page 6: Specifications

    5. SPECIFICATIONS 5.13. Dimensions 1¾ H, 17 W,10½ D Voltage ±24 or ±48 V Typical (excluding brackets) ±22 to ±58 V Maximum 19” and 23” Racks 5.14. Rack Mounting GMT Fuse Size 0.18 to 20 Amps Max* 1” and 1.25” hole spacing 450A@60V I.R.
  • Page 7: Technical Services

    Voice: (800) 377-8766 Return Material Authorization (RMA) number email: global_support@westell.com from Westell by calling or using one of the options shown below. Once an RMA number For additional information about Westell, visit is obtained, return the defective unit (freight...
  • Page 8 __________________________________________________________________________________...
  • Page 9 BUS A BUS B __________________________________________________________________________________...
  • Page 10 __________________________________________________________________________________...

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