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Square D QOB two-pole bolt-on breaker, 30 A, grey plastic housing, paddle actuator

SQUARE D

SQUARE D QOB230VH Circuit Breaker 30A 2 Pole 120/240V

SKU CH-NG4K-5RW9S

A 30 A, two-pole miniature circuit breaker with 22 kA interrupting capacity for QO-series panelboards

  • High interrupting capacity rated 22 kA at 120/240 V AC
  • Bolt-on mounting fits Square D QO and NQOD panelboards
  • 30 A two-pole protection for 120/240 V single-phase circuits
  • Pressure-plate terminals simplify wire installation
  • Compact 3 × 1.5 × 2.9 in frame suits 100 A QO enclosures

30 A Two-Pole Breaker for QO Panels

The SQUARE D QOB230VH is a miniature circuit breaker rated at 30 A for single-phase 120/240 V AC systems. It uses a bolt-on mounting style and a paddle actuator for direct installation in compatible Square D QO load centres. This new device provides high interrupting capacity protection for residential and light-commercial branch circuits.

22 kA Interrupting Capacity at 120/240 V AC

The breaker delivers a maximum AIR rating of 22 kA at its rated voltage, ensuring safe fault-current interruption in panels fed by transformers or service entrances with high available short-circuit current. This single specification determines whether the device meets the engineer's coordination study for the installation.

Bolt-On Fit for QO Series Load Centres

The unit mounts directly onto the bus stab of Square D QO and NQOD panelboards using its pressure-plate terminals, requiring no DIN rail or additional hardware. Its 100 A frame size and compact 3 in by 1.5 in footprint leave space for adjacent breakers, while the two-pole design occupies two standard pole positions in the panel.

Highlights

  • High interrupting capacity rated 22 kA at 120/240 V AC
  • Bolt-on mounting fits Square D QO and NQOD panelboards
  • 30 A two-pole protection for 120/240 V single-phase circuits
  • Pressure-plate terminals simplify wire installation
  • Compact 3 × 1.5 × 2.9 in frame suits 100 A QO enclosures

Specifications

BrandSQUARE D

Questions about this item

What does the 30 A rating mean once the breaker is installed in a panel?

It means the breaker will carry up to 30 A continuously and trip if the load exceeds that value, protecting the downstream wiring.

How does the 22 kA interrupting capacity limit what the breaker can handle in a fault?

It caps the maximum prospective short-circuit current the breaker can safely interrupt at 120/240 V AC to 22 kA; systems with higher available fault current need a higher-rated device.

What panel space and mounting style are required for this two-pole unit?

It mounts by bolting onto a Square D QO-series panelboard, occupies a 100 A frame slot, and measures 3 in long by 1.5 in wide by 2.9 in deep.

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