Variable speed with 3 position switch (variable • off • full). Allows adjustment of a single speed router from 0 to full speed range in just seconds! Reduces speed without reducing torque. Includes a replaceable time delay fuse for added circuit protection. **Note**: For use with single speed routers featuring brush style motors up to 3-1/4 HP or 115 Volt/15 AMPS only. Not for use with soft start motors.