I looked under the cap of the flow switch ( the bright red cap in the photos ), and it is a coolant flow detection switch, there is a normally open microswitch mounted above a plunger. It is not a relay or solenoid to control or stop the flow. It closes the microswitch sending a signal to the large control board on top when there is water flowing, thats why I was wondering if it throttles the amperage when there is no flow, for torch protection.