N463936 supersedes older part numbers: N421952

Genuine DeWalt Motor & Switch Assembly, part number N463936 — direct replacement for the motor and electronic switch module used in DeWalt brushless SDS‑Plus rotary hammers. This assembly restores reliable brushless motor operation and the electronic switch control (useful if your tool is smoking, sparking, losing power or the trigger no longer responds), returning the tool to factory‑level performance.

Fits DeWalt DCH273 (Type 1 & Type 2) and DCH274 (Type 1) rotary hammer models that use the 18/20 V XR brushless platform — a direct compatibility match if your drill is one of these exact model/types. This part is what you want when replacing a failed motor/switch to avoid fitting issues with other power tool parts.

Simple to install for anyone comfortable opening the rear housing of the tool; the assembly replaces the internal motor and trigger/switch block as a single unit so you don’t need to diagnose separate subcomponents. Use the DeWalt model and type stamping from your tool to confirm exact fit before installing.