SIEMENS GNF321A 3P 30A 240V General Duty Safety Switch Indoor, Non-Fusible, ANSI 61 Grey
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The unit is nothing more than a closed-loop system In a proper box, there should be an off switch. To protect the circuit breaker, you'll need one. At my home workshop, I have a very small subpanel connected to a properly-placed circuit breaker A 240V breaker of the correct size. It will save me time from having to trip the breaker every time I turn off the VFD by installing this switch on the milling machine.