Altech Corp.


In stock
Circuit Breaker, 1 Pole, B-Curve, 4 Amp, UL1077 480Y/277VAC, 10kA, Supplementary Protection.

When your application requires supplemental protection for control circuits and on the load side of branch circuit protectors, we have your solution! Our AC supplementary protectors are available up to 63 amp in 1 to 3 poles at 480Y/227VAC with a 10kA short circuit withstand rating!

Altech has an established line of UL1077/UL508 Busbars with ratings up to 200A. They are UL recognized and listed for use with most competitor's supplementary protectors and manual motor controllers.

More Information
Part Number 1BU4R
Poles 1 Pole
Trip Curve B Curve
Amp Rating 4 Amp
Voltage 480Y/277VAC
Type UL1077
Short Circuit Capacity 10kA
Product Series R Series
Availability Please Contact Us
Weight - lbs. 0.3500
Base Unit of Measure Each

Altech R Series - UL1077 Listed Supplementary Protectors - Circuit Breakers:

  • Available from 0.5 to 63 Amps
  • UL 1077 Listed - used for overload protection
  • One, two or three pole
  • DIN rail mounted
  • 17.5mm width
  • Terminal torque: Industry standard rating of up to 63A/480Y/277V
    • 14-3 AWG: 17.5 lb-in. (2.0 Nm)
    • 18-16 AWG: 25 lb-in. (2.8 Nm)
  • Thermal Magnetic
  • Short circuit withstand capacity 10kA
  • Positive trip indicator (green - off/tripped, red - on)
  • B, C or D trip curves
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