I am converting an old Collins 20V-3 to use on 75 and I want to use the
power cutback circuit. This involves switching in some high wattage
resistors into the HV line. I have 2 P&B PRD type DPST relays that look
like they will work fine. I am concerned about using a relay that is only
rated to 277VAC, 20A. Since I will be switching up to 3200VDC, is there a
safety potential here? I do not intend to hot switch them, turn off the
plate voltage, then switch. The bases on these relays are made from
Bakelite. They are NOS and in good condition. A friend of mine pointed out
that with the HV there might be a problem with the proximity to the 24V
coils. The P&B relays are part number PRD60055. The alternative is to
switch the cutback resistors with a hefty ceramic rotary switch, or a pair
of vacuum relays.
Would appreciate hearing comments from the group.
Happy Holidays,
Bob W6TR
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