Genuine Makita controller — part no. 620343-0. Compact electronic controller module used inside the grinder’s handle/rear cover to manage switching and motor control; listed as the replacement "CONTROLLER" in Makita parts diagrams for several angle-grinder models. This is the exact Makita part number you’d order to restore correct switching and electronic control.
Fits these Makita angle-grinder models (examples): GA4540R (115 mm), GA4541R (115 mm), GA5040R (125 mm), GA5041R (125 mm). Check your tool’s parts diagram number 039 (CONTROLLER) to confirm fitment for your specific serial/version.
If you’re repairing a grinder and prefer genuine Makita components, this controller is a direct-match replacement listed in Makita service parts lists for the above models. Use this part when sourcing power tool parts for a clean, like‑for‑like repair.
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