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Instrument
Switches are used to control Electrical Equipment such as
Voltmeters, Ammeters and Wattmeters.
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| Type
Number |
Function |
| V 0/... |
Voltmeter
Selector selecting one of three phase to be read against the
neutral. (OFF, R-N, W-N, B-N) |
| V 3/... |
Voltmeter
Selector selecting one of three phases to be read against another
phase. (OFF, R-W, W-B, R-B) |
| V 30/... |
Voltmeter
Selector selecting one of three phase to be read against the
neutral and one of three phases to be read against another phase.
(R-W, W-B, R-B, OFF, R-N, W-N, B-N). |
| AU 31/... |
Ammeter Selector
selecting one of three phases to be read against the common
point of current transformers. (OFF, R, W, R)
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| AU 32/... |
Ammeter
Selector selecting one of three phases to be read straight through
with or without Current Transformers. (OFF, R, W, R) |
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