• The March Safety float switch is available as a Model P-FS and as a Model S-FS switch.
• The Model P-FS makes contact with the electrical current as the float rises 1/2 inch due to the water accumulation. This enables the pumps, such as Model C, 2U, 2C, etc. to have automatic "on"-"off" operation as the water collects in the pan. As the pumps pump out the water the float lowers and shuts the pump off.
• The Model S-FS breaks contact as the float rises and hence can be used as a safety control to shut off the air conditioner to prevent water overflowing the pan.
• The Models P-FS and S-FS are the same construction except for the position of the mercury tube. You can reverse the position of the mercury tube to make either a P-FS or an S-FS switch.
