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This
assembly, mounted on aluminum brackets, was removed from a working MRI
machine power cabinet to strip it of all its parts. This piece consists of
3 Silicon Power Rectifier-Diodes from Powerex Corp.
These are PRX part number 1N3296R
each 100A High Power Rectifier-Diodes
(I think that the "R" in the part number means Reverse Polarity
where the stud is the anode.)
and a
Powerex: Inverter Grade Silicon Controlled Rectifier (SCR)
also know as a Thyristor
part number C387N-PRX
TO-200AC, 800V, 500A, TQ=40
and a
VE2500-235
Methode SRC Clamp
A thyristor is a
four-layer
semiconductor
device, consisting of alternating P type and N type materials (PNPN).
A thyristor usually has three electrodes: an
anode, a
cathode, and a
gate (control electrode).
The most common type of
thyristor is the silicon-controlled rectifier (SCR). When the
cathode is negatively charged relative to the anode, no
current
flows until a pulse is applied to the gate. Then the SCR begins to
conduct, and continues to conduct until the voltage between the
cathode and anode is reversed or reduced below a certain threshold
value. Using this type of thyristor, large amounts of power can be
switched or controlled using a small triggering current or
voltage.
Thyristors are used in
motor speed controls, light dimmers, pressure-control systems, and
liquid-level regulators.
Parts appear in
excellent condition as you can see in the photos but have
not been personally tested. Since I have no way to do
this, they are being sold "as-is all sales final.
I have represented this item honestly to the best of my
ability....Andy
Aluminum brackets overall size: 5½" x 6"
Weight 3½ lbs.
Click on pictures below for larger images.
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