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Square D QGA221251 Molded Case Circuit Breaker
- 125A
- 2 Pole
- I-Line
Square D
QGA221251
Molded Case Circuit Breaker
Brand
Square D
SKU
QGA221251
Quantity
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Square D QGA221251 - 125A 2 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty environments, the Square D QGA221251 provides 125A of robust overcurrent protection. As part of the PowerPacT Q-Frame lineup, this 2-pole MCCB utilizes fixed thermal-magnetic trip technology for Long-Time and Instantaneous (LI) functions. Designed with an AB phase connection, the breaker mounts into Square D I-Line panelboards and switchboards. It replaces the discontinued Q22125 model. With a 65kAIC rating at 240VAC, it features a visual trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | QGA221251 |
| Series | QGA |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 208Y/120VAC, 240VAC |
| Phase | 1 |
| AIC Rating | 65kA @ 208Y/120VAC, 65kA @ 240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards (HCN, HCM, HCW, HCWM), Square D I-Line 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, Alarm Switch, Undervoltage Release, Padlock Attachment |
|---|---|
| Accessories | Phase Connection AB (Factory Configured) |
| Standards | CSA C22.2 No. 5, HACR Rated, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, Phase Connection AB, 80% Rated |
Product FAQs
8 answersWhich panelboards accept the QGA221251 circuit breaker?
This breaker is specifically engineered for Square D I-Line panelboards, including the HCN, HCM, HCW, and HCWM series, as well as I-Line switchboards. It will not fit standard QO or Homeline load centers.
What does the 1 at the end of the QGA221251 catalog number indicate?
The 1 suffix indicates that this 2-pole breaker is factory-configured for an AB phase connection on the I-Line bus stack.
What is the difference between Square D QBA, QDA, QGA, and QJA breakers?
The third letter in the PowerPacT Q-Frame catalog number indicates the interrupting capacity at 240VAC. QBA is rated for 10kA, QDA for 25kA, QGA for 65kA, and QJA for 100kA.
Can the QGA221251 replace older Square D breakers?
Yes, this PowerPacT Q-Frame breaker serves as the direct replacement for the discontinued Square D Q22125 model, maintaining the same 125A capacity and I-Line mounting footprint.
What type of load-side connections does the QGA221251 have?
The load side is equipped with mechanical box-type lugs that accept 4 AWG to 300 kcmil aluminum or copper wire. The line side uses the I-Line plug-on bracket, so no line-side wiring is required.
Is the trip unit on the QGA221251 adjustable?
No, this breaker features a fixed thermal-magnetic trip unit. Both the Long-Time (overload) and Instantaneous (short circuit) trip thresholds are factory-set and cannot be adjusted in the field.
Is the QGA221251 suitable for HVAC equipment?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires group-motor protection.
How can I manually test the tripping mechanism on the QGA221251?
You can use the integral push-to-trip button located on the front cover of the breaker. Pressing this button manually exercises the mechanism to ensure it is functioning correctly.
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