Square D QJA221251 Molded Case Circuit Breaker
- 125A
- 2 Pole
- I-Line
Square D
QJA221251
Molded Case Circuit Breaker
Brand
Square D
SKU
QJA221251
Quantity
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Square D QJA221251 - 125A 2 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial and industrial environments, the Square D QJA221251 is a 2-pole, 125A MCCB from the PowerPacT Q-Frame family. Featuring an I-Line mounting style with a factory-configured AB phase connection, it installs into Square D I-Line panelboards and switchboards. It also replaces legacy Q22125 breakers. Rated at 100kAIC at 240VAC, this breaker ensures superior fault clearing. It includes fixed long-time and instantaneous (LI) trip functions and a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Series | QJA |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 208Y/120VAC, 240VAC |
| Phase | 1 |
| AIC Rating | 100kA @ 208Y/120VAC, 100kA @ 240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | 4 AWG - 300 kcmil (Al/Cu) |
| Max Wire | 300 kcmil |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Phase Connection AB (Factory Configured) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, NOM-003-SCFI-2000, UL 489 |
| Approval | ANCE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, High Interrupting Capacity |
Product FAQs
7 answersWhat panelboards accept the QJA221251 breaker?
The QJA221251 is designed exclusively for Square D I-Line panelboards and switchboards. It utilizes an I-Line style plug-in connection to stab directly onto the interior bus.
What does the "J" in the QJA221251 catalog number indicate?
The "J" designates the interrupting rating tier for this PowerPacT Q-Frame breaker, which provides a 100kAIC rating at 240VAC.
What does the "A" in the QJA221251 catalog number signify?
The "A" indicates an I-Line shroud on the ON end of the breaker, which is the standard plug-in mounting configuration for I-Line panelboards.
What does the "1" suffix at the end of the QJA221251 part number mean?
The "1" suffix indicates a factory-configured AB phase connection. This determines which two bus bars the breaker will connect to when installed in a 3-phase I-Line panelboard.
What wire sizes do the lugs on the QJA221251 accept?
The factory box lugs on this breaker accept 4 AWG to 300 kcmil aluminum or copper conductors.
What type of trip unit is installed in the QJA221251?
This breaker is equipped with a fixed thermal-magnetic trip unit that provides non-adjustable long-time and instantaneous (LI) overcurrent protection.
Can the QJA221251 replace older Square D Q-Frame breakers?
Yes, current PowerPacT Q-Frame circuit breakers are direct replacements for discontinued Square D Q2 series devices with matching specifications.
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