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What class of fuse does a QMB363TW use?

They use Class H, K, J, and R fuses.
When using class R fuses you must install the Class R Fuse Rejection Kits which is a HRK1020.
To field modify for Class J fuses - move the load side fuse base to the position indicated in the switch.
Refer to wiring diagram on device for more information.

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