1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

WHAT is it? What is the value?

Discussion in 'General Electronics Chat' started by gary350, Dec 22, 2017.

  1. gary350

    gary350 Well-Known Member

    Joined:
    Dec 28, 2005
    Messages:
    1,110
    Likes:
    55
    Location:
    Murfreesboro, TN 37129 USA
    First item, I looked up the number online 3 different places show me photos of ICs. This is not an IC. It might be a 40 year old SCR. Wonder what the value is? Wonder if I can use it as a power diode? I need 100 amps for my next project. Can an SCR be used as a diode

    [​IMG]

    The next item may be an SCR too it has 2 terminals on the side and comes with a very large 25 lb aluminum heat sink. Judging by the 800 amp wire that was connected to this equipment before it was scrapped this item may be 800 amp with a voltage rating of 600 volts or higher. I have 3 of these. I can not find any information online.

    [​IMG]

    [​IMG]

    I hope this item is 100 amp. I can not find any information on it.

    [​IMG]
     
    Last edited: Dec 22, 2017
  2. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

    Joined:
    Jun 21, 2006
    Messages:
    6,167
    Likes:
    528
    Location:
    Cleveland, OH, USA
  3. gary350

    gary350 Well-Known Member

    Joined:
    Dec 28, 2005
    Messages:
    1,110
    Likes:
    55
    Location:
    Murfreesboro, TN 37129 USA
    WHO sells heat sinks? I need 1500w heat sinks.

    WHAT is gate voltage? What size resistor do I need from gate to B+?

    All my SCRs are the same. They are all NPN-P. Online says, gate connects to anode to keep SCRs on all the time. To make construction easy I need 2 diodes on each heat sink. To do that with mounting lugs diodes in need 2 NPN and 2 PNP. If I use 4 NPN-P SCRs I need 4 heat sinks. Wire size looks like it can handle 75 amps.

    Maybe this thread is in the wrong place? Maybe it should be in Projects?
     
    Last edited: Dec 22, 2017
  4. dave

    Dave New Member

    Joined:
    Jan 12, 1997
    Messages:
    -
    Likes:
    0


     
  5. vtech

    vtech Member

    Joined:
    May 21, 2012
    Messages:
    148
    Likes:
    22
    Location:
    Atlanta, Ga

    71RC120A ;
    110A 1200V SCR made by Intl. Rectifier

    T198N 600TOC;
    Thyristor/SCR 198Amp, 600V made by AEG/Telefunken

    672384;
    Old Union Carbide house number. Generic; 300A 250v (reverse case) stud mount rectifier made by Intl. Rectifier
     
    • Like Like x 1
  6. gary350

    gary350 Well-Known Member

    Joined:
    Dec 28, 2005
    Messages:
    1,110
    Likes:
    55
    Location:
    Murfreesboro, TN 37129 USA
    I tested the SCRs today 2 out of 6 are good. I put 11 VDC on the SCR then used AAA batteries on the gate. 2 batteries will not trigger the gate because it is rated 3V but 3 batteries will trigger the gate. Once the SCR is on remove batteries will not turn it off but removing 11v power it turns off. Works exactly like it should. The other 4 SCRs are bad, 1 is shorted in both directions the other 3 will not turn on.

    I tested all 16 of my 300 amp diodes they are all good. My only choice is to use the 300a 1200v diodes on my 20v 75a circuit. These diodes will be bullet proof in this circuit.
     
    Last edited: Dec 23, 2017
  7. ChrisP58

    ChrisP58 Well-Known Member

    Joined:
    Apr 27, 2012
    Messages:
    1,085
    Likes:
    131
    Location:
    Provo, Utah, USA
    Yes, you can use a triggered SCR as a diode.

    But be aware, the forward voltage will be higher, so it will dissipate more heat than a regular diode would while conducting the same current.

    If that means a significantly larger heat sink, then you may be better off just buying the right diode.
     

Share This Page