Thermal Reset Switch B333-0400B

Thermal Reset Switch (B333-0400B)

The B333-0400B is the manual-reset thermal switch that protects the suction motor from overheating on Tacony commercial uprights. When the motor compartment exceeds a safe temperature — usually from a clog or restricted airflow — the switch opens to cut power, and it is reset by hand once the machine cools and the restriction is cleared. This is the current genuine switch and supersedes the earlier 33522.

A thermal switch that fails open leaves the machine dead, while one that fails to trip removes the motor’s overheat protection — both are reasons to fit a genuine replacement. Installing the B333-0400B restores correct thermal protection with a proper reset. The same switch serves the CleanMax Pro-Series and the matching Carpet Pro machines.

Compatible Models

This genuine Tacony component is engineered to fit the following machines:

CleanMax

• CleanMax CMP-3N
• CleanMax CMP-3T
• CleanMax CMP-3QD
• CleanMax CMPS-QDZ

Carpet Pro

• Carpet Pro CPU-3N
• Carpet Pro CPU-3QD

Fitment is confirmed against Tacony PartSmart Where-Used records. The B333-0400B supersedes the older 33522. If your model is not listed, contact us before ordering.

Frequently Asked Questions

What does the B333-0400B thermal switch do?

It is a manual-reset thermal cut-out that opens to protect the motor when the compartment overheats, typically from a clog. It is reset by hand once the machine cools and the restriction is cleared.

Does the B333-0400B replace 33522?

Yes. The B333-0400B is the current genuine manual-reset thermal switch and supersedes the earlier 33522.

Which machines use the B333-0400B?

It fits CleanMax CMP-3N, CMP-3T, CMP-3QD and CMPS-QDZ, and the matching Carpet Pro CPU-3N and CPU-3QD uprights.

Order the genuine B333-0400B thermal reset switch today, or contact Twin City Vacuum if you need help confirming fitment.