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Brown Boveri AVR - Regulators

Brown Boveri AVR - Regulators

Brown Boveri AVR - Regulators

(OP)
I have a couple of old Brown Boveri Voltage regulators (the old switch blade, swiss watch looking squares).

Does anyone know how the ratings are specified on these AVR's?

NAMEPLATE:
NR B73817 Type AB4/1
110V  8.01ohms
30/13A 60Hz
VA 071949/1

What does the 30/13A mean?  I think 13A is the pilot field current in the rotating exciter when the AC generator is operating at rated load and power factor.  Does the 30A refer to a forcing value?  I didn't think forcing was available on this vintage of AVR.

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