FIELD: electricity.
SUBSTANCE: for control purpose two cam switches are provided, which actuate from cam disc mechanically connected to Maltese wheel and thus to contact-bearing switching shaft of switch. Cam disc has horizontally separate circuit on its end surface, besides one of both cam switches rolls along each part of circuit.
EFFECT: detection of failure in Maltese gear for driving switching shaft, simplified design and alignment of switch, and increase of its affordability.
8 cl, 4 dwg
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