1-1957-2B3

Technical Characteristics

• Thread Length

  0.437 inches nominal single mounting facility

• Flat Height

  0.219 inches nominal single actuator

• Nonturn Device Radius

  0.375 inches nominal at 3:00 o'clock

• Throw Quantity

  3 each section rear

• Nominal Thread Size

  0.375 inches single mounting facility

• Contact Voltage Rating In Volts

  115.0 ac at sea level

• Rotor Through Connection Quantity

  1 each section

• Switch Actuator Positioning Increment

  60.0 degrees single actuator

• Iii Detent Rotational Torque Range

  2.000 to 28.000 inch-ounces single actuator

• Contact Load Current Rating

  5.0 amperes resistive load ac at sea level

• Iii Precious Material

  silver

• Thread Series Designator

  unef single mounting facility

• Thread Class

  2a single mounting facility

• Iii Hazardous Locations/Environmental Protection

  explosion proof

• Overall Length

  2.245 inches nominal

• First Flat Length

  0.250 inches nominal single actuator

• Shaft Diameter

  0.250 inches nominal single actuator

• Shaft Length

  0.437 inches nominal single actuator

• Overall Diameter

  1.170 inches nominal

• Individual Section Quantity

  2

• Nonturn Device Type

  tab at 3:00 o'clock

• Iii Operating Temp Range

  -65.0 to 85.0 deg celsius

• Switch Contact Basic Design

  nonpile-up symmetrical

• Pole Quantity

  1 each section front

• Mounting Method

  threaded bushing single mounting facility

• Contact Voltage Rating In Volts

  28.0 dc at sea level

• Iii Shaft Flat/Slot Angular Location

  45.0 degrees from nonturn device single actuator

• Switch Actuator Indexing Position Quantity

  3 single actuator

• Shaft Type

  round, flatted single actuator

• Terminal Type

  tab, solder lug

• Contact Switching Action

  breaks before makes each section rear

• Switch Actuator Stop Device Type

  fixed stop single actuator

• Contact Load Current Rating

  3.0 amperes resistive load dc at sea level

• Iii Precious Material And Location

  contacts and terminal surfaces silver

• Style Designator

  9 tap, circular, bushing mount