Corrosion-Resistant Design with No Wetted Metals or Elastomers. The Plast-O-Matic Series SWT contains a snap-action electric switch with three terminals. One is common, one is normallyopen, and one is normally-closed. The normally-open switch will close upon reaching the set pressure, and the normallyclosed switch will open when set pressure is reached. Set pressure can be reached by higher system pressure falling to the set value, or when lower system pressure rises to the set value.

Example: the switch can be set to actuate at 50 PSI, rising pressure (switch actuates when pressure rises to 50 PSI). When the pressure rises to 50 PSI the normally-open contact will close, and the normally-closed contact will open. Therefore, depending on how the switch is wired, a light, or a pump, etc.can be energized or deenergized... or one item could be energized and another de-energized at the same moment. As the pressure continues to rise, no further changes occur.

• PVC body, 1/2" NPT connection.
• Used to signal equipment when pressure in a piping|system either rises or falls to a set pressure.
• Adjusts easily with adjusting screw.
• Maximum operating pressure of 150 PSI via three easy-to-change spring ranges.
• NEMA 4X design and patented Fail-Dry enhance system safety.
• Electrical switch is UL recognized and CSA approved.
• Corrosion-resistant plastic cord grip and 18" cable simplify installation.
• Better piston design and piston guidance vs. competition enhances reliability and accuracy.
• Tested to 1,000,000 cycles in laboratory conditions.
• PTFE diaphragm with no wetted metals or elastomers is ideal for ultra-pure liquids.
• Versatile snap-action 16 Amp/3 terminal switch is standard; 25 Amp and low deadband 3 Amp switches optional.
• Operating Pressure 3 Ranges: 15-50 PSI, All three springs are in 50-100 PSI, 100-150 PSI according to the spring installed. All three springs are included, the middle range (50-100) is installed by the factory unless otherwise specified.
• Standard Switch 16 Amps at 125 VAC, 1/2 HP; 6 Amps at 250 VAC, 1/2 HP.