The Klixon® bimetal disc with welded-on contact is the heart of the MA10. It is welded on the upper terminal which is riveted to the plastic base. The lower terminal carries the stationary contact and is also riveted to the phenolic base. The operating principle of the MA10 is both simple and effective. Its open structure allows optimum thermal response.
When a fault condition occurs, the increased ambient temperature causes the Klixon® bimetal disc to snap open the contacts.

As the device cools down to a safe temperature again, the contacts will automatically reset. The MA10 is available with a wide range of calibrated pre-set operating temperatures (with varying tolerances). Since the current flows through the bimetal disc, changing the bimetal resistivity makes it possible to vary the product’s current sensitivity.
A high, middle and low current-sensitive bimetal disc is available at no additional charge.