Square D HJA36100U31X Molded Case Circuit Breaker
- 100A
- 3 Pole
- I-Line
Square D
HJA36100U31X
Molded Case Circuit Breaker
Brand
Square D
SKU
HJA36100U31X
Quantity
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Square D HJA36100U31X - 100A 3 Pole Molded Case Circuit Breaker
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Description
The Square D HJA36100U31X is a 100A, 3-pole MCCB from the PowerPacT H-Frame family, built for commercial and industrial electrical systems. This unit installs into Square D I-Line panelboards and switchboards. It serves as an electronic-trip upgrade for legacy FA36100 and FH36100 breakers. Rated 65kAIC at 480V, it features a Micrologic 3.2 trip unit with adjustable LI settings. True RMS sensing ensures superior coordination.Specifications
| Brand | Square D |
|---|---|
| Part Number | HJA36100U31X |
| Series | HJA |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 25-100A |
|---|
| Frame Type | HJA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | 14 AWG - 3/0 AWG |
| Max Wire | 3/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator, Rotary Handle |
|---|---|
| Accessories | Micrologic 3.2 Trip Unit |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, Visual Trip Indicator, Reverse Feed, 80% Rated, True RMS Sensing |
Product FAQs
6 answersCan the HJA36100U31X replace older Square D FA or FH frame breakers?
Yes, PowerPacT H-frame I-Line circuit breakers serve as the direct modern replacements for legacy Square D FA, FC, and FH frame I-Line breakers, such as the FA36100 and FH36100.
How does the HJA36100U31X connect to the panel bus?
It uses Square D's proprietary I-Line plug-on connection, which allows the breaker to snap directly onto the bus in an I-Line panelboard or switchboard without requiring bolted bus connections.
What trip features are included with the U31X suffix?
The U31X designation indicates the breaker is equipped with a Micrologic 3.2 solid-state electronic trip unit. This provides highly accurate, adjustable long-time and instantaneous (LI) protection settings for precise system coordination.
What wire sizes are compatible with the factory lugs on this breaker?
The standard mechanical lugs on the load side of the HJA36100U31X accept aluminum or copper wire gauges ranging from 14 AWG up to 3/0 AWG.
Does the HJA36100U31X provide ground fault protection?
No, the Micrologic 3.2 trip unit only provides long-time and instantaneous (LI) protection. It does not include ground fault (G) or short-time (S) trip functions.
Can I install this breaker in a standard QO or NQ panelboard?
No, the HJA36100U31X features an I-Line plug-in mounting style and is exclusively compatible with Square D I-Line panelboards and switchboards.
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