Square D QBL32250 Molded Case Circuit Breaker

This unit-mount PowerPacT Q-Frame breaker is compatible with Square D Q2 series individual enclosures, such as the Q23225NF, Q23225NS, and Q23225NRB. It can also be installed in compatible Square D switchboards and panelboards designed for unit-mount Q-Frame breakers.

The difference lies in the interrupting rating. The QBL32250 has a 10kAIC rating at 240VAC, while the QDL32250 offers a higher 25kAIC rating. Other variants include the QGL (65kAIC) and QJL (100kAIC), all of which share the same physical Q-Frame dimensions.

The QBL32250 is a unit-mount, feed-thru circuit breaker. It bolts directly to the backpan or mounting surface of the enclosure, rather than plugging onto a bus bar or using a stab-on I-Line connection.

The standard line and load lugs for this 250A Q-Frame breaker should be torqued to 248 lb-in (28 N.m). Always verify the torque specifications printed on the physical breaker label before finalizing your installation.

The QBL32250 features a fixed thermal-magnetic trip unit with a magnetic hold current of 1200A and a magnetic tripping current of 2400A. This allows the breaker to handle brief inrush currents up to 1200A without tripping, while providing instantaneous protection at 2400A.

Yes, PowerPacT Q-Frame breakers like the QBL32250 are direct replacements for legacy Square D Q2 Series devices. They will fit into the same Q2 enclosures, though you must ensure the 10kA short circuit rating meets your current facility requirements.

No, the QBL32250 is a unit-mount breaker equipped with lugs on both ends. For an I-Line panelboard, you need the I-Line version of this breaker, which typically features an "A" in the third position of the catalog number, such as the QBA32250.