Voltage is analogous to pressure, so the voltage rating is the same thing as the pressure rating on a pressurized tank. If you apply too much pressure, both a capacitor and a tank will explode.
Speaking roughly, normal levels of thyroid-stimulating hormone (TSH) are in the range of 0.4 to 4.0 mIU/L. However, each laboratory and test manufacturer identifies its own normal TSH range. This is based on the test, the equipment being used, and the patients being tested.
If the thyroid TSH levels are low, hyperthyroidism is instead a most likely diagnosis. Normal TSH range levels are between 0.3 and 3.0 and when the thyroid is assumed to be functioning well. Many practitioner, especially when fertility and pregnancy are concerned, prefer to see TSH levels less than 2.