Hubbell 4320 Fascicule

Hubbell Industrial Controls, Inc

Specifications 4320 * January 2000
Replaces February 1994

4320

Hubbell offers the Type 4320 diode rectifier,
specifically designed and rated for the demand-
ing requirements where short circuits on the DC
output bus are common or probably.  The unit is
ideally suited for applications such as scrap lift-
ing magnets or cranes.

Addressing the common problem of blown semi-
conductor fuses resulting from cut magnet ca-
bles, shorted magnets, or crane rail faults.  The
4320 offers a rectifier system that eliminates all
fusing in the rectifier.  Traditional rectifier design
incorporates the use of silver and, fast acting,
current limiting, semi-conductor fuses to protect
rectifier diodes in the event of a DC fault.  The
4320 rectifier design eliminates the need for
these fuses.

The 4320 rectifier design will trip the unit’s AC
input breaker in the event of a DC output bus
fault.  After the fault is cleared, the user simply
resets the unit’s AC breaker and the unit is op-
erational.

♦  No blown fuses to replace

♦  No spare fuses to inventory

♦  Downtime associated with changing power

semi-conductor fuses is eliminated

♦  AC input voltage: 460V, 3Ph, 60Hz.

♦  Nominal DC output: 240VDC

♦  AC molded case circuit breaker

♦  Dry Type isolation transformer:  Transformer

has one 5% tap above and below nominal
input voltage

♦  DC bleed resistor

♦  Full wave, six pulse, diode rectifier assem-

bly; mounted on oversize extruded alumi-
num head sinks

♦  Diode peak inverse voltage to be six times

the bridge AC RMS voltage

♦  Heavy Duty surge suppression specifically

rated for highly inductive load kick applica-
tion.  i.e. Magnets

♦  Power on indication light

♦  Industrial duty floor mounted NEMA 2 in-

door, or NEMA 3R outdoor, convection
cooled, vented enclosure with hinged door
access

♦  Single side access to all components

♦  Enclosure grounding lug

♦  DC ammeter and/or voltmeter

♦  Remote on/off pushbutton

♦  Flange mounted on/off pushbutton