Built for heavy-duty power distribution, the Square D HDL36150 is a 3-pole, 150A molded case circuit breaker. As part of the PowerPacT H-Frame series, it utilizes fixed thermal-magnetic trip technology to protect commercial and industrial circuits. This unit mount MCCB installs into switchboards and industrial control panels. It acts as a seamless, modern upgrade for legacy K-Frame KAL36150 breakers. Delivering 14 kAIC at 600VAC, it features a Visi-Trip indicator and is fully HACR rated.
HACR Rated, Current Limiting, Visual Trip Indicator, Reverse Feed
Product FAQs
8 answers
What size wire do the standard lugs on the HDL36150 accept?
The factory-installed AL150HD lugs accept one 14 AWG to 3/0 AWG aluminum or copper wire per terminal.
Can the HDL36150 be reverse fed?
Yes, thermal-magnetic PowerPacT H-frame breakers are suitable for reverse feeding. The line and load connections are not restricted to specific sides, allowing incoming power to be connected to either end.
Can the HDL36150 be mounted on a DIN rail?
Yes. While this PowerPacT H-frame breaker is a unit-mount device by default, it can be attached to a standard 35mm DIN rail by installing a compatible adapter, such as the Schneider Electric S29305 DIN rail mounting kit.
Is the HDL36150 suitable for direct current (DC) circuits?
Yes, this thermal-magnetic breaker is rated for DC applications up to 250VDC, offering an interrupting capacity of 20 kAIC at that voltage.
What is the difference between the HDL36150 and the HGL36150, HJL36150, or HLL36150 breakers?
The third letter in the catalog number indicates the short-circuit interrupting rating. The HDL36150 has a D-rated interrupting capacity (18 kAIC at 480VAC), whereas the G, J, and L versions offer progressively higher interrupting ratings (35 kA, 65 kA, and 100 kA at 480VAC respectively). The physical dimensions and footprint remain identical across these variants.
Is the HDL36150 rated for continuous operation at 100 percent of its current rating?
No, this is a standard-rated circuit breaker. Per National Electrical Code (NEC) guidelines, it is intended to be loaded continuously at a maximum of 80 percent of its 150-amp rating.
Does the HDL36150 provide ground fault protection?
No. This breaker is equipped with standard Long-Time and Instantaneous (LI) trip functions for overload and short-circuit protection. It does not provide equipment ground fault or personal ground fault (GFCI) protection.
What internal accessories can be field-installed in the HDL36150?
PowerPacT H-frame breakers feature internal accessory compartments that can accept field-installable auxiliary contacts (OF), alarm switches (SD), overcurrent trip switches (SDE), and shunt trips or undervoltage releases (MX/MN).
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