Belonging to the PowerPacT H-Frame series, the Square D HGA36040 is a 3-pole, 40A molded case circuit breaker. It delivers reliable thermal-magnetic protection with fixed LI trip functions. It installs into Square D I-Line panelboards and switchboards, effectively replacing older FA36040 and FH36040 breakers to maintain existing infrastructure. With an interrupting capacity of 35 kAIC at 480VAC, this HACR-rated breaker provides current-limiting performance and includes load side lugs.
Which panelboards accept the HGA36040 circuit breaker?
This breaker is designed specifically for Square D I-Line panelboards and switchboards. It mounts directly to the I-Line bus stack and is not compatible with NQ, NF, QO, or standard load centers.
How are the line and load connections configured on this breaker?
The HGA36040 features a stab-on I-Line connection for the line side, which pushes directly onto the panel bus. The load side is equipped with mechanical lugs that accept 14 to 3/0 AWG aluminum or copper wire.
What are the required tightening torques for the load lugs?
For 14 to 10 AWG wire, the mechanical lugs should be torqued to 44 lb-in (5 N.m). For 8 to 3/0 AWG wire, torque the lugs to 124 lb-in (14 N.m).
What is the recommended wire stripping length for the load terminals?
Strip the wire insulation back 0.63 inches (16 mm) before inserting the conductor into the load side mechanical lugs.
What are the fixed magnetic hold and trip thresholds for this 40A breaker?
The factory-sealed thermal-magnetic trip unit has a fixed magnetic hold current of 400A and a magnetic tripping current of 850A.
Is the HGA36040 rated for continuous operation at 100% of its nameplate amperage?
No, this model carries a standard 80% continuous current rating. Continuous loads running for three hours or more should not exceed 32 amps.
What does the letter G signify in the HGA36040 catalog number?
In the Square D PowerPacT nomenclature, the G indicates the interrupting rating tier. This specific tier delivers a breaking capacity of 65kA at 240VAC, 35kA at 480VAC, and 18kA at 600VAC.
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Review summary
Customers rate this product 4.8 out of 5 based on 4 reviews.