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Posted to sci.electronics.misc,sci.electronics.repair,rec.crafts.metalworking,rec.woodworking
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Why use a contactor?
A friend (in USA) with a 220v, 1-phase horizontal bandsaw in his home machine
shop wants to replace the 1/4 hp motor with 1/2 hp and rewire with an auto-off switch (when the blade cuts through the metal). I always default to using a 3-wire control with contactor, but he asks the logical question: "Why?" Other than the "If the power fails while cutting" answer (which he says seems of limited additional value on a saw with auto-stop feature) I wasn't very convincing. What are the arguments for using a contactor as opposed to a simple on-off switch of equivalent rating? Thanks. |
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