HJA36125 - Square D - PowerPacT H I-Line Molded Case Circuit Breaker - 125 Amp - 3 Pole - 600 Volt
HJA36125 - Square D - PowerPacT H I-Line Molded Case Circuit Breaker - 125 Amp - 3 Pole - 600 Volt
Product images are representative only. Actual product may vary.
The Square D HJA36125 is a 125A, 3-pole PowerPacT H-Frame molded case circuit breaker with an I-Line plug-in line-side connection, rated 600VAC and built for Square D I-Line panelboards and switchboards.
At 125 amps this is the top of the H-Frame 150A frame's common feeder range, delivering thermal-magnetic Long-Time and Instantaneous (LI) protection with a 65kA interrupting rating at 480VAC and 100kA at 240VAC. Current-limiting construction cuts peak let-through energy during a short circuit, which protects downstream conductors and supports series-rated combinations. The breaker plugs directly onto the I-Line bus with ABC phase sequence and ships with mechanical load lugs accepting up to 3/0 AWG. A Visi-Trip indicator distinguishes a fault trip from a manual open.
Specifications
| Brand | Square D / Schneider Electric |
|---|---|
| Series | PowerPacT H-Frame, I-Line, Type HJ |
| Part Number | HJA36125 |
| Amperage | 125A (150A frame) |
| Voltage | 600VAC, 480VAC, 240VAC, 250VDC |
| Poles | 3 |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC, 20kA @ 250VDC (UL 489) |
| Mounting Style | I-Line Plug-In |
| Terminal Type | I-Line jaws on line side, mechanical lugs on load side |
| Phase Sequence | ABC |
| Continuous Current Rating | 80% |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Trip Technology | Thermal Magnetic (LI — Long-Time, Instantaneous) |
| Trip Adjustability | Fixed Thermal / Fixed Magnetic |
| Wire Range | #14 AWG – 3/0 AWG (Al/Cu) |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
| Standards | UL 489, CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, RoHS, REACh, HACR |
| Approvals | UL, CSA, CE, IEC, NEMA, NOM |
| Construction Features | Current Limiting, HACR Rated, Visi-Trip Indicator, Reverse Feed Capable, Non-Interchangeable Trip |
| Operating Temperature | -25°C to 70°C |
| Shipping Dimensions | 16 x 10 x 10 in |
| Shipping Weight | 9 lb |
| Condition | New |
Frequently Asked Questions
What is the interrupting rating of the HJA36125?
65kA at 480VAC, 100kA at 240VAC, 25kA at 600VAC, and 20kA at 250VDC.
What does HJA36125 stand for?
H = PowerPacT H-Frame, J = 65kA interrupting rating at 480VAC, A = I-Line plug-in with ABC phase sequence, 3 = 3 poles, 6 = 600V class, and 125 = 125 amps.
Is the HJA36125 trip setting adjustable?
No. It uses a fixed thermal and fixed magnetic (LI) trip unit that is non-interchangeable, so the 125A rating is permanent.
What panelboards does the HJA36125 fit?
Square D I-Line panelboards and switchboards. The I-Line jaws plug directly onto the bus with ABC phase sequence.
Is the HJA36125 current limiting?
Yes. It limits peak let-through current and I²t during a short circuit, reducing stress on downstream conductors and equipment.
What wire sizes do the load lugs accept?
The supplied mechanical lugs accept #14 AWG through 3/0 AWG aluminum or copper conductors.
What is the continuous load limit for the HJA36125?
At 80% rating, continuous loads should not exceed 100 amps unless applied in an assembly listed for 100% continuous duty.
Is the HJA36125 UL listed?
Yes. It is UL 489 listed and also certified to CSA C22.2 No. 5, IEC 60947-2, and NOM, with CE marking and RoHS/REACh compliance.