Square D QOU320 Miniature Circuit Breaker

Yes [1.1.3]. This thermal-magnetic breaker features reversible line and load lugs, allowing it to be reverse fed for flexible flush or surface mount wiring applications.

No. QOU series breakers are unit-mount, feed-thru breakers designed for OEM panels, control panels, and enclosures. They are not plug-on breakers and cannot be installed in standard QO residential or commercial load centers.

It is a unit-mount breaker that supports direct flush or surface mounting. It can also be installed on standard 35mm DIN rail systems by attaching a compatible Square D mounting clip adapter.

No. As a feed-thru breaker, it comes equipped with slotted box lugs on both the line and load sides. This allows for direct, independent wire connections from 14 to 2 AWG (Al/Cu) without needing a busbar or panelboard interior.

The slotted box lugs on the QOU320 should be torqued to 45 lb-in when securing 14 to 2 AWG aluminum or copper conductors.

Yes. In addition to its primary AC specifications, the QOU320 is UL Listed for use in 48 VDC systems, providing a 5 kA interrupting rating for low-voltage direct current applications.

Yes. The breaker is HACR rated, making it fully approved for safely protecting heating, air conditioning, and refrigeration equipment circuits.

For lockout/tagout compliance, you can use the Square D QOU1PL handle padlock attachment. It is designed to secure 2-pole and 3-pole QOU miniature circuit breakers in either the ON or OFF position.