Tornado Tempest Microswitch K66303310

The Tornado Tempest microswitch (part# K66303310) is the power switch on the Electronics assembly of the TV400-W26-U cordless wide-area sweeper. Tacony lists it as Microswitch, Tempest. It is a snap-action switch: the operator control moves an actuator, the actuator presses the switch plunger, and at a precise point of travel the internal contacts flip over and complete the 36V control circuit to the system control board (part# K46833200).

Snap-action is the important detail. The switch is designed to change state decisively rather than gradually, which is what prevents arcing across the contacts at the moment of switching. When a microswitch wears out, that snap softens — the contacts begin to make and break slowly, they pit and carbonise, and the machine develops the intermittent starting that owners usually blame on the battery.

Compatible Models for the Microswitch

• Tornado Tempest Wide-Area Cordless Carpet Vacuum Sweeper — Model TV400-W26-U

Symptoms that point to the microswitch

• The Tempest starts intermittently with a known-good, fully charged pack.
• The control has to be jiggled, pressed harder, or held to keep the machine running.
• The switch no longer gives a clean audible click when operated.
• The machine cuts out mid-pass and restarts if the control is released and pressed again.
• Continuity across the switch is erratic when it is operated by hand off the machine.

Check the switch before you suspect the electronics. It is a fraction of the cost of either control board and produces very similar symptoms. Also inspect its housing (part# K50609980) at the same time — if the carrier is cracked or distorted, a new switch will fail the same way because it will sit in the same wrong position.

Fitting notes

The switch mounts into its housing and is secured with an M4 x 16 screw (part# K73032050) with a spring washer and hex nut. Remove the battery pack before working in the control area. On reassembly, operate the control through its full travel and confirm the switch clicks crisply at the same point every time before closing the machine up.

Twin City Vacuum has been selling and servicing Tornado equipment since 1956. Browse the full Tornado Tempest parts range, or see the Tornado Tempest TV400-W26-U machine. Manufacturer information is at tornadovac.com.

Frequently Asked Questions

What does the microswitch do on the Tornado Tempest?

It is the power switch. The operator control presses its plunger, and at a set point of travel the snap-action contacts close and complete the 36V control circuit to the system control board. Releasing the control opens the circuit and stops the machine.

How do I know if my microswitch needs replacing?

Intermittent starting on a known-good charged battery is the classic sign, along with a switch that no longer clicks crisply, or a machine that cuts out mid-pass and restarts when the control is released and pressed again. Test continuity across the switch while operating it by hand — erratic readings confirm it.

What models is the microswitch (part# K66303310) compatible with?

The Tornado Tempest TV400-W26-U wide-area cordless carpet sweeper. It is a Tempest-specific switch and is not shared with the Tornado Strike or Zephyr.

How much is the Tornado Tempest microswitch?

It is priced at the manufacturer’s suggested retail price of $27.13. Tacony currently publishes a minimum advertised price on this switch that sits below our dealer cost, so we price at MSRP rather than below what the part costs us. Call 763-535-0770 if you need it today and we will confirm stock.

How do I order the microswitch (part# K66303310) or get help?

You can add the microswitch (part# K66303310) directly to your cart on this page, or call us at 763-535-0770. Our staff at 5415 West Broadway, Crystal, MN 55428 has been servicing Tornado equipment since 1956 and can help confirm the right part for your machine.

Questions? Call us at 763-535-0770 or visit us at 5415 West Broadway, Crystal, MN 55428.