1-1957M3-2N

Technical Characteristics

• Shaft Diameter

  0.248 inches minimum single actuator and 0.251 inches maximum

• Shaft Length

  0.834 inches minimum single actuator and 0.914 inches maximum

• Nonturn Device Type

  tab at 3:00 o'clock

• Operating Temp Range

  -65.0 to 85.0 deg celsius

• Pole Quantity

  1 each section front

• Throw Quantity

  2 each section rear

• Nominal Thread Size

  0.375 inches single mounting facility

• Contact Voltage Rating In Volts

  115.0 ac at sea level

• Shaft Flat/Slot Angular Location

  195.0 degrees from nonturn device single actuator

• Terminal Type

  tab, solder lug

• Switch Actuator Stop Device Type

  fixed stop single actuator

• Contact Load Current Rating

  2.0 amperes resistive load ac at sea level and 1.0 amperes inductive load

• Style Designator

  9 tap, circular, bushing mount

• Thread Series Designator

  unef single mounting facility

• Thread Class

  2a single mounting facility

• Thread Length

  0.417 inches minimum single mounting facility and 0.457 inches maximum

• Hazardous Locations/Environmental Protection

  explosion proof

• Overall Length

  2.427 inches minimum and 2.755 inches maximum

• First Flat Length

  0.230 inches minimum single actuator and 0.270 inches maximum

• Flat Height

  0.215 inches minimum single actuator and 0.221 inches maximum

• Overall Diameter

  1.100 inches minimum and 1.306 inches maximum

• Nonturn Device Radius

  0.360 inches minimum at 3:00 o'clock and 0.390 inches maximum

• Individual Section Quantity

  3

• Switch Contact Basic Design

  nonpile-up symmetrical

• Mounting Method

  threaded bushing single mounting facility

• Contact Voltage Rating In Volts

  28.0 dc at sea level

• Rotor Through Connection Quantity

  1 each section

• Switch Actuator Indexing Position Quantity

  2 single actuator

• Shaft Type

  round, flatted single actuator

• Contact Switching Action

  breaks before makes each section rear

• Switch Actuator Positioning Increment

  60.0 degrees single actuator

• Detent Rotational Torque Range

  0.5 to 2.5 inch-pounds (pound-inches) single actuator

• Contact Load Current Rating

  1.0 amperes inductive load dc at sea level

• Test Data Document

  81349-mil-s-3786 specification