FIELD: engines and pumps.
SUBSTANCE: invention relates to electrical engineering. Switch comprises operating component, first and second circuits. First circuit comprises bush connected with operating element with terminal and varistor plate. Varistor plate features resistance varying at the brush terminal position change to make first circuit feed control signal to motor in response to terminal position. Second circuit connects brush and varistor plate not via terminal at brush in preset position relative to said plate. Electrical tool incorporates above described rpm variator switch.
EFFECT: more stable operation of electrical tool.
11 cl, 17 dwg
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