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DIN Rail Mount Circuit Breakers, 17.5 mm (0.69") Width per Pole

DIN Rail Mount Circuit Breakers


Item# AU-2B4UR

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $29.10
5-9 $28.52
10-24 $27.94
25-49 $26.77
50-99 $26.48
100+ $26.19

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Lead Time ( If not in Stock): 2 weeks

DIN Rail Mount Circuit Breakers AU-2B4UR AU-2B4UR
  • DIN Rail Mounted
  • 17.5 mm (0.69") Width per Pole
  • Thermal Magnetic Overcurrent Protection
  • 0.5 - 60 A, 480Y/277 Vac, 50/60 Hz
  • 10 kA Short Circuit Interrupting Capacity
  • UL Recognized E137915
  • Dual Connection Terminals, Box Clamp and Ring Tongue/Forked Terminals
  • Marking Area with Clear Cover

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Amperage Rating
Number of Terminals
Minimum Wire Size
Maximum Wire Size
Pole Width
Curve Type

Product Specs


While UL489 branch circuit breakers protect feeder or branch circuits, R Series UL1077 supplementary protectors are made to trip faster than a standard UL489 circuit breaker, therefore providing additional protection for specific devices. Supplementary protectors provide critical protection in applications where branch circuit protection is not required, or is already provided by a separate device.
R Series supplementary protectors are available in one, two, and three-pole configurations and up to 20 different current ratings from 0.5A to 60A and can safely be used in applications up to 480Y/277 Vac with a 10 kA short circuit withstand Rating.

Three different trip characteristics, including B, C and D curves, give you the ability to configure the exact protection scheme you require.

B-Trip Protectors
Include business equipment, wiring protection, lighting, appliances, control circuits and some electronic applications. Relatively long thermal trip delay but low magnetic trip point.

C-Trip Protectors
Include lighting, wiring protection, appliances, business equipment, and control circuit applications. Relatively long thermal trip delay and medium magnetic trip point.

D-Trip Protectors
Include control transformers, power supplies and reactive loads. Relatively long thermal trip delay and very high magnetic trip point.

Features Provided by the Different Types of Circuit Breakers
UL1077 Recognized Supplementry Protectors
    Overload Protection

UL508 Listed Manual Motor Controllers
    Overload Protection
    Switching Function
    Disconnect Function

UL489 Miniature Molded Case Circuit Breakers
    Overload Protection
    Switching Function
    Disconnect Function
    Short Circuit Protection

Voltage Rating: 480Y/277 Vac
Short Circuit Withstand Rating (UL - Ratings):
    0.5-10A (RC): 10kA with no back-up fuse
    12-60A (RC): 10kA with UL-listed Class J back-up fuse 5kA with no back-up fuse
Calibration Temperature: 30°C (86°F)
Operating Temperature: -25 to 55°C (-13 to 131°F)
Storage Temperature: -40 to 70°C (-40 to 158°F)
Terminal Size Acceptability:
    Top: 18-3 AWG
    Bottom: 18-2 AWG (line/load reversible)
Tightening Torque (min/max): 17.7/25 lb-in. (2/2.8 Nm)
Terminal Protection Degree: IP20
Vibration Resistance: ≥15g
    Height: 89.3 mm (3.51")
      One Pole: 17.5 mm (0.69")
      2 Pole: 35 mm (1.38")
      3 Pole: 52.5 mm (2.07")
Depth:68.4 mm (2.69") from DIN rail

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