Square D HDL36125 Molded Case Circuit Breaker

The third letter in the catalog number designates the interrupting rating at 480VAC. The HDL36125 is rated for 18 kA, the HGL36125 for 35 kA, and the HJL36125 for 65 kA at 480VAC. All three share the same physical dimensions, but you must select the rating that meets your system's available fault current.

Unit mount indicates this breaker is designed to be bolted or surface-mounted directly to a backpan in a switchboard, industrial control panel, or enclosure. It uses feed-through lugs on both the line and load sides, meaning it cannot plug into an I-Line panelboard.

The factory-installed AL150HD lugs accept 14 AWG to 3/0 AWG aluminum or copper wire. The tightening torque is 44.3 lb-in for 14 AWG to 10 AWG wire, and 124 lb-in for 8 AWG to 3/0 AWG wire.

Yes. The PowerPacT H-Frame supports field-installable internal accessories. It includes compartments behind the front cover for an auxiliary switch (OF), alarm switch (SD), overcurrent trip switch (SDE), and a voltage release such as a shunt trip (MX) or undervoltage release (MN).

Yes, this thermal-magnetic H-Frame breaker is UL listed for up to 250VDC with an interrupting capacity of 20 kA. When used in DC systems, it relies on its fixed magnetic trip element.

No, the HDL36125 uses a standard thermal-magnetic trip unit with fixed thermal and fixed magnetic settings. It does not feature the adjustable dials found on breakers equipped with MicroLogic electronic trip units.

Yes, unit-mount PowerPacT H-Frame circuit breakers can be utilized as a main or sub-feed breaker in NQ and NF panelboards when installed with the appropriate mounting kit.

It is a standard 80 percent rated circuit breaker. Continuous loads should not exceed 80 percent of its 125A rating, meaning it supports a 100A maximum continuous load per standard NEC guidelines.