Rated at 100kAIC for 480V systems, the Square D HLL36125 is a 125A, 3-pole molded case circuit breaker from the PowerPact H-Frame series. It is engineered for heavy-duty commercial and industrial applications. The unit-mount design secures into industrial control panels, switchboards, and enclosures. It includes line and load lugs that accommodate 14 to 3/0 AWG wire. This breaker features a thermal-magnetic trip unit with Long-Time and Instantaneous (LI) functions and is fully HACR rated.
What lugs are standard on the HLL36125, and what wire sizes do they accept?
This breaker comes standard with AL150HD mechanical lugs, which accept 14 AWG to 3/0 AWG aluminum or copper wire.
Can the HLL36125 be used in DC applications?
Yes, it is rated for DC systems, providing up to 20kA interrupting capacity at 250VDC and 50kA at 500VDC.
How does the thermal-magnetic trip unit on the HLL36125 operate?
It features an LI (Long-Time, Instantaneous) trip function. The thermal protection for overloads is fixed, while the magnetic protection for short circuits is adjustable.
What does the "HLL" prefix in the HLL36125 catalog number mean?
In the Square D PowerPacT nomenclature, "H" stands for the H-Frame, the first "L" indicates the interrupting rating (100kA at 480VAC), and the second "L" signifies that the breaker comes with lugs on both the line and load sides.
Is the HLL36125 an I-Line or unit-mount breaker?
The HLL36125 is a unit-mount (bolt-on) breaker with lugs on both ends. If you need the I-Line plug-on equivalent for a Square D panelboard, you will need catalog number HLA36125.
Can I add a shunt trip or auxiliary switch to the HLL36125?
Yes, the PowerPacT H-Frame supports a wide range of field-installable internal accessories, including shunt trips, undervoltage releases, and auxiliary switches.
Where can the HLL36125 be installed?
It is a unit-mount breaker designed for use in industrial control panels, switchboards, and standalone enclosures.
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