HJA36020 - Square D - PowerPacT H I-Line Molded Case Circuit Breaker - 20 Amp - 3 Pole - 600 Volt
HJA36020 - Square D - PowerPacT H I-Line Molded Case Circuit Breaker - 20 Amp - 3 Pole - 600 Volt
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The Square D HJA36020 is a 20A, 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.
This thermal-magnetic breaker provides fixed Long-Time and Instantaneous (LI) protection with a 65kA interrupting rating at 480VAC and 100kA at 240VAC. Its current-limiting design cuts peak let-through energy during a fault, protecting downstream equipment and allowing tighter series ratings. The H-Frame is the modern successor to Square D's discontinued F-Frame line and drops directly into existing I-Line mounting space, making it a clean upgrade path from the FC36020, FA36020, and FH36020. A Visi-Trip indicator shows at a glance whether the unit tripped on a fault, and the 80% continuous rating suits standard commercial branch and feeder circuits.
Specifications
| Brand | Square D / Schneider Electric |
|---|---|
| Series | PowerPacT H-Frame, I-Line, Type HJ |
| Part Number | HJA36020 |
| Amperage | 20A (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) |
| Replaces | Square D FC36020, FA36020, FH36020 |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Rotary Handle, Motor Operator |
| Standards | UL 489, CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, HACR |
| Approvals | UL, CSA, CE, IEC, NOM |
| Construction Features | Current Limiting, HACR Rated, Visi-Trip Indicator, Reverse Feed Capable |
| Operating Temperature | -25°C to 70°C |
| Shipping Dimensions | 14 x 10 x 10 in |
| Shipping Weight | 8 lb |
| Condition | New |
Frequently Asked Questions
What is the interrupting rating of the HJA36020?
65kA at 480VAC, 100kA at 240VAC, 25kA at 600VAC, and 20kA at 250VDC.
What does HJA36020 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 020 = 20 amps.
Which older Square D breakers does the HJA36020 replace?
It is the current replacement for the discontinued FC36020, FA36020, and FH36020. The H-Frame uses the same I-Line mounting space, so no bus modification is required.
Is the HJA36020 current limiting?
Yes. It limits peak let-through current and energy during a short circuit, which reduces thermal and magnetic stress on downstream conductors and equipment.
Is the trip setting on the HJA36020 adjustable?
No. It uses a fixed thermal and fixed magnetic (LI) trip unit, so the 20A rating is not field-adjustable.
Can the HJA36020 be reverse fed?
Yes. The breaker is suitable for reverse feed applications, with no line/load marking restriction under UL 489.
What is the continuous load limit for the HJA36020?
The breaker is 80% rated, so continuous loads should not exceed 16 amps unless applied in an assembly listed for 100% continuous duty.
Is the HJA36020 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.