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Hubbell Industrial Controls, Inc
Lifting Magnet Power Supplies
Specifications 4320 * January 2000
Replaces February 1994
4320
General
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.
Cost Savings:
♦ No blown fuses to replace
♦ No spare fuses to inventory
♦ Downtime associated with changing power
semi-conductor fuses is eliminated
Standard Features of the Type
4320 Rectifier:
♦ 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
Options:
♦ DC ammeter and/or voltmeter
♦ Remote on/off pushbutton
♦ Flange mounted on/off pushbutton