Video: How do you install thermal units and auxiliary contacts to a NEMA Type S starter?

Installing Melting Alloy Thermal Units

1. Disconnect all power from the controller.
2. Hold the thermal unit with the ratchet (geared) wheel on the left and the part number facing you.
3. Insert the thermal unit into the overload block, ensuring the pawl lever rests on top of the ratchet wheel.
4. With the lever positioned correctly, install and tighten both mounting screws.
5. Repeat Steps 2 through 4 for each thermal unit being installed.
6. After all thermal units (or jumper straps for single-phase applications) are installed, firmly press the reset button/bar. A ratcheting sound should be heard, and the pawl lever should move to the normal (untripped) position.

Installing Auxiliary Contacts

1. Disconnect all power from the controller.
2. Remove the auxiliary contact from its packaging. Assemble the contact block to the mounting plate by sliding the contact onto the mounting tab and securing it with the supplied screw.
3. Position the operating lever so it engages the contactor's movable contact carrier. If necessary, remove the lever and rotate it 180° for proper engagement. This allows any single-circuit auxiliary contact to be installed in any of the four available positions.
4. Secure the auxiliary contact mounting bracket to the contactor baseplate using the two supplied screws.
5. Before placing the starter into service, manually operate the contact carrier to verify proper auxiliary contact operation and correct engagement of the operating lever.

Note: Tighten all screws according to the torque specifications provided in the applicable instruction bulletin.