51-1921-4B4C

Technical Characteristics

• First Flat Length

  0.250 inches nominal single actuator

• Flat Height

  0.216 inches nominal single actuator

• Shaft Length

  0.437 inches nominal single actuator

• Overall Diameter

  1.000 inches minimum and 1.306 inches maximum

• Nonturn Device Radius

  0.375 inches nominal at 3:00 o'clock

• Individual Section Quantity

  4

• Nonturn Device Type

  tab at 3:00 o'clock

• Operating Temp Range

  -65.0/+125.0 deg celsius

• Nominal Thread Size

  0.375 inches single mounting facility

• Contact Voltage Rating In Volts

  115.0

• Contact Voltage Rating In Volts

  28.0

• Shaft Flat/Slot Angular Location

  195.0 degrees from nonturn device single actuator

• Rotor Through Connection Quantity

  1 each section

• Switch Actuator Indexing Position Quantity

  4 single actuator

• Terminal Type

  tab, solder lug

• Switch Actuator Positioning Increment

  90.0 degrees single actuator

• ~1

  a level

• Contact Load Current Rating

  250.0 milliamperes resistive load and 100.0 milliamperes inductive load dc at se

• Style Designator

  9 tap, circular, bushing mount

• Test Data Document

  81349-mil-s-3786 specification

• Thread Series Designator

  unef single mounting facility

• Thread Class

  2a single mounting facility

• Thread Length

  0.437 inches nominal single mounting facility

• Hazardous Locations/Environmental Protection

  explosion proof

• Overall Length

  2.937 inches nominal

• Shaft Diameter

  0.250 inches nominal single actuator

• Switch Contact Basic Design

  nonpile-up symmetrical

• Pole Quantity

  1 each section front

• Throw Quantity

  4 each section rear

• Mounting Method

  threaded bushing single mounting facility

• Shaft Type

  round, flatted single actuator

• Contact Switching Action

  breaks before makes each section rear

• Detent Rotational Torque Range

  +1.0/+4.5 inch-pounds (pound-inches) single actuator

• Contact Load Current Rating

  75.0 milliamperes resistive load ac at sea level

• Specification/Standard Data

  81349-mil-s-3786/4 government specification