Allen-Bradley Q, M Frame CB Installation Instructions

Allen-Bradley Q, M Frame CB are circuit breakers designed for thermal-magnetic trip functions. They offer adjustable settings for overload and short circuit protection, ensuring safety and reliability. These breakers are suitable for a wide range of applications, including industrial, commercial, and residential settings. The trip unit includes either a fixed or an adjustable thermal element for inverse time delay on overload and an adjustable magnetic element for protection against short circuits.

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Allen-Bradley Q, M Frame CB Installation Instructions | Manualzz

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Key features

  • Thermal-magnetic trip units
  • Adjustable overload and short circuit protection
  • UL489 certified
  • Fixed or adjustable thermal element
  • Magnetic trip adjustment
  • Q and M-Frame compatible
  • Internal accessory compatibility

Frequently asked questions

Allen-Bradley Q and M-Frame circuit breakers come in two trip functions: thermal-magnetic trip functions (described in this instruction leaflet) and electronic trip functions (covered in Instruction Leaflet 40752-072).

The thermal element provides inverse time delay protection against overloads. It trips the circuit breaker within 2 hours for an overload of 135 percent and trips in less time for higher overloads.

You can adjust the magnetic trip setting on each pole of the trip unit by rotating the adjustment buttons on the front face of the trip unit with a screwdriver. The buttons have several settings as indicated on the nameplate with values in multiples of the trip unit ampere rating (In).
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