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    How to determine the size of fuse to use for Magelis HMI?

    To determine the size of fuse to use with a Magelis HMI, we use the basic formula as follows:

    Fuse Rating = (Max # watts / Voltage) x 1.25.

    For the example of the HMIG3U + HMIDT732, the max draw is 55W.

    Therefore, we have Fuse Rating = (55W / 24 VDC) x 1.25 = 2.89 A => 3 A fuse recommended.

    To find the max draw of your particular Magelis HMI, please check the manual.

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