There are no particular methods to regulate the adjuster; it is quite straightforward, by just positioning the adjuster on the rated current value of the motor to protect in across-the-line circuitry. This value is given on the motor nameplate or data sheet. All the same, there are a few important factors, indicated by IEC/EN 60947-4-1 standards, to take into consideration for motor thermal protection:
1.	The thermal protections must NOT trip when the current flowing through them does not exceed 5% of the adjuster setting. E.g. If the adjuster of a thermal protection is regulated at 10A, there must not be any tripping up to 10+5% = 10.5A. The intent of the standards is to avoid tripping due to slight overload conditions, insignificant for motor operation. Therefore, it is better to exclude the random increase of the adjuster setting, to avoid provisional untimely tripping of the thermal protection. Otherwise doing so, would reduce the efficacy of the protection.
2.	The thermal protections must trip when the current flowing through them is equal to or greater than 20% of the adjuster setting.As a result and according to the above mentioned, the thermal protection has a tripping tolerance range between 5 and 20% of the current setting.
Take into account the tripping time of thermal protection can be quite different, although the current value is the same, depending on the extent of the overload and the operating conditions which preceded it. Consequently, it can vary between a few seconds and several minutes.