Rotary Switches - Ammeter & Voltmeter

Rotary Switches - Ammeter & Voltmeter

Panel metering switches fall generally into two groups - Ammeter and Voltmeter switches. Ammeter switches can be directly connected, but more generally are fed from current transformers (C/T's). When C/T fed, the switch must have make-before-break contacts when switching between phases, as an open circuit could generate dangerously high voltages.

Voltmeter and ammeter selector switches are used to switch between phases for measurement on a three phase system. Voltmeter switches are available to switch between line-line voltage or line-line and line-neutral voltage while the ammeter selector switch switches between the three phase line currents. The output from the rotary switch can then be fed to an analogue or digital measuring instrument. The voltmeter and ammeter switches offer long term switching reliability and high current switching contacts.

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Craig & Derricott - Electrical Isolation Eqpt Catalogue

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Rotary Switches - Ammeter & Voltmeter Switches

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Voltmeter Switches - ABB LV Voltmeter Systems

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