644A-3

Technical Characteristics

• Contact Adjustability

  deactuation point not adjustable and actuation point not adjustable

• Overall Diameter

  1.870 inches nominal

• Contact Action Stimulus

  increase

• Contact Voltage Rating In Volts

  28.0 dc at altitude single voltage

• Nonpile-Up Contact Arrangement

  1 pole, double throw, one position momentary

• Pressure Switch Type

  absolute

• Mounting Facility Pattern

  three position circular

• Mounting Method

  unthreaded hole

• Unthreaded Mounting Hole Diameter

  0.210 inches nominal

• Media For Which Designed

  gas, liquefied

• Mounting Facility Circle Radius

  1.500 inches nominal

• Terminal Type

  threaded stud

• Style Designator

  cylindrical

• Contact Stimulus Rating

  11.20 actuation point nominal pounds per square inch absolute and 0.67 deactuation point maximum pounds per square inch absolute

• Body Length

  3.500 inches maximum

• Overall Length

  3.900 inches nominal

• Contact Load Current Rating

  5.0 amperes resistive load single voltage