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Entry 1 sense Webster, 1913

Hammer break

· Ham·mer break · IPA
01 An interrupter in which contact is broken by the movement of an automatically vibrating hammer between a contact piece and an electromagnet…
  1. 1.
    An interrupter in which contact is broken by the movement of an automatically vibrating hammer between a contact piece and an electromagnet, or of a rapidly moving piece mechanically driven.(Elec.)