Square D QOB215 Miniature Circuit Breaker

No. The QOB215 features a bolt-on connection designed specifically for commercial Square D NQ and NQOD panelboards. Standard residential QO load centers require plug-on breakers and lack the tapped busbars needed for a bolt-on installation.

The primary difference is the mounting method. The QO215 is a plug-on breaker used in standard load centers, while the QOB215 is a bolt-on breaker used in commercial panelboards. Both models share the same 15-amp, 2-pole thermal-magnetic trip characteristics.

Yes. The QOB series is the direct factory replacement for obsolete Q1B bolt-on branch breakers originally installed in older NQO and NQOB panelboards.

The LI designation means the breaker's thermal-magnetic trip unit includes Long-time and Instantaneous protection. The Long-time (thermal) function handles sustained overloads and allows temporary motor inrushes without nuisance tripping, while the Instantaneous (magnetic) function trips immediately during high-current short circuits.

Yes. In addition to its AC ratings, the QOB215 is rated for up to 48VDC with an interrupting capacity of 5kA. This makes it suitable for low-voltage DC distribution or industrial control circuits requiring a bolt-on form factor.

Strip the copper or aluminum conductor and insert it into the pressure plate terminal, which accepts wire sizes from 14 AWG to 8 AWG. Always tighten the terminal screw to the exact torque value printed on the side of the breaker to ensure a safe, NEC-compliant connection.

Yes. Like most standard Square D QO and QOB circuit breakers, the QOB215 is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment.

When the breaker trips due to an overload or short circuit, the handle snaps to a midpoint position and a highly visible red indicator appears in a window on the breaker face. This safety feature allows you to quickly identify the tripped breaker in a fully populated panelboard.