Sizing MPCB

[mjbarcelona]

Hi guys, just making sure that I'll be choosing the right size of MPCB, motor connected in star with current 3.32A, would a MPCB rated at 4A - 6.3A be good enough? Thanks!

 

[SheffSimon]

No. Use one whose range covers the FLC of the motor, and set it to that value.

 

[James]

that would be fine if your also using a contactor and overload relay that is set to FLC of motor.

but if that is the only device protecting the motor from overload then as @SheffSimon says above, get the correct matched rating (nameplate of motor, not actual current measured) or the motor will burn out before the breaker trips.