503A351

Technical Characteristics

• Body Style

  2a single pole type

• Bushing Length

  0.360 inches minimum and 0.380 inches maximum

• Case Material

  metal

• Fragility Factor

  moderately rugged

• Mounting Surface To Terminal End Distance

  1.700 inches maximum

• Arc Quenching Method

  magnetic blowout

• Mounting Facility Type And Quantity

  1 threaded bushing w/panel seal

• Storage Type

  general purpose warehouse

• Thread Quantity Per Inch

  32

• Maximum Continuous Load Current Rating Per Pole

  35.0 amperes dc single location

• Operating Voltage Type And Rating Per Pole In Volts

  50.0 dc single location

• Circuit Protection Type

  overcurrent single location

• Ultimate Trip Rating Of Continuous Current Rating Per Pole In Percent

  115.0 single location

• Reset Method

  manual

• Main Contact Tripping Mechanism Type

  trip free

• Manual Actuator Type And Quantity

  1 toggle

• Actuator Position Designation

  at pole one

• Nominal Thread Size

  0.375 inches

• Trip Delay Time In Seconds Per Rated Continuous Current

  0.120 minimum at 200 pct single location and 0.700 maximum at 200 pct

• Inclosure Protection Type For Which Designed

  shockproof and vibrationproof and hermetically sealed

• Thread Series Designator

  unef

• Thread Pitch Diameters

  0.3503 to 0.3537 inches

• Body Length

  1.448 inches minimum and 1.510 inches maximum

• Body Width

  0.567 inches minimum and 0.629 inches maximum

• Center To Center Distance Between Terminals Parallel To Length

  0.844 inches minimum and 0.906 inches maximum

• Pole Quantity

  1

• Maximum Interrupting Capacity Current Type And Rating Per Pole In Amps

  500.0 dc single location

• Trip Release Method

  magnetic-hydraulic single location

• Trip Release Characteristic

  time delay single location

• Actuator Function

  trip-reset

• Internal Trip Release Configuration

  relay trip single location

• Unpackaged Unit Weight

  2.100 ounces

• Terminal Type And Quantity

  4 wire hook