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Compact grey miniature circuit breaker with black paddle actuator and lug terminals

SQUARE D

SQUARE D QO150 50A 1 Pole 120/240V AC Circuit Breaker

SKU CH-VQ5C-HZEKD

A single-pole, 50 A miniature breaker for QO load centres and NQ panelboards, rated 120/240 V AC with a 10 kA interrupting capacity

  • 50 A single-pole protection for 120/240 V AC circuits
  • 10 kA interrupting rating handles high fault currents safely
  • Plug-in mounting fits QO load centres and NQ panelboards directly
  • Lug terminals accept wire up to 100 A frame size
  • Operates reliably from 77 °F minimum temperature

50 A Single-Pole Breaker for QO Panels

The Square D QO150 is a 50-amp, single-pole miniature circuit breaker designed for QO-series load centres and NQ panelboards. It accepts a 120/240 V AC supply and carries a 10 kA interrupting rating at that voltage. The plug-in mounting style allows quick installation on the bus bar without bolt-on hardware.

100 A Frame with 48 V DC Rating

Built on a 100 A frame, the breaker provides ample headroom for continuous 50 A loads such as large appliance circuits or sub-panel feeds. The 48 V DC rating extends usability to low-voltage DC control circuits, while the standard paddle actuator gives clear on/off indication. Thermal-magnetic trip curves protect conductors without nuisance tripping under normal inrush.

Lug Terminals and Compact Profile

A single lug terminal accepts the line and load conductors, simplifying wiring in tight panel gutters. At 3.1 inches long, 0.8 inches wide and 2.9 inches deep, the unit fits standard QO pole spacing, leaving adjacent positions free for additional breakers. Minimum operating temperature is rated at 77 °F, so the device is intended for indoor or conditioned environments.

Highlights

  • 50 A single-pole protection for 120/240 V AC circuits
  • 10 kA interrupting rating handles high fault currents safely
  • Plug-in mounting fits QO load centres and NQ panelboards directly
  • Lug terminals accept wire up to 100 A frame size
  • Operates reliably from 77 °F minimum temperature

Specifications

BrandSQUARE D

Questions about this item

Will the 50 A single-pole breaker fit in my existing QO load centre alongside older QO breakers?

Yes, the breaker uses the standard QO plug-in mounting and 100 A frame size, so it installs directly in any QO load centre or NQ panelboard that accepts QO series breakers.

How can I verify the breaker is operating correctly once installed?

Switch the paddle actuator to the ON position; the breaker should remain latched and carry up to 50 A at 120/240 V AC with a 10 kA interrupting rating under normal load.

Does the package include mounting hardware or lugs, or must I buy them separately?

The breaker has integral lug terminals and plug-in mounting clips built in, so no separate lugs or mounting hardware are required for installation in a compatible QO panel.

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