If an old infinite switch is "B" rated and the new one is not, what happens?

If an old infinite switch is rated "B" and the new one is not, the result is that the unit will heat less at the same knob setting. This scenario often occurs because the infinite switch's rating indicates its capacity and performance characteristics. An "A" or "B" rating typically denotes the switch's ability to handle specific power levels and its efficiency in regulating the amount of heat generated.

When replacing a rated switch with one that lacks that same rating, you may not get the same level of performance. The new switch may not be engineered to provide the same output of heat that the original one was capable of delivering, leading to a decrease in heating efficiency. As a result, when set to the same position, it will not reach the same temperature as intended, causing the unit to heat less despite the knob being set at the same level.

This understanding is crucial when dealing with replacement parts, as using components with different specifications can significantly affect the functionality and efficiency of the equipment.