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Square D Q2L3125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Square D
Q2L3125
Molded Case Circuit Breaker
Brand
Square D
SKU
Q2L3125
Quantity
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Square D Q2L3125 - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Quantity
Square D Q2L3125 - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | Q2L3125-R |
| Series | Q2L |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Individual Enclosures, Switchboards, NQOD Panelboards |
| 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 |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, Common Trip, HACR Rated |
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Quantity
Square D Q2L3125 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Series | Q2L |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Individual Enclosures, Switchboards, NQOD Panelboards |
| 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 |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, Common Trip, HACR Rated |
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Description
Built for robust industrial applications, the Square D Q2L3125 is a 125A, 3-pole molded case circuit breaker operating at 240VAC. It delivers reliable thermal-magnetic protection to safeguard facility infrastructure. This unit mount breaker integrates into Square D individual enclosures, switchboards, and NQOD panelboards. As a legacy Q-frame device, it is replaced by the QBL32125. Equipped with fixed long-time and instantaneous (LI) trip functions, it provides a 10kAIC rating and Visi-Trip.Specifications
| Brand | Square D |
|---|---|
| Part Number | Q2L3125-R |
| Series | Q2L |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Individual Enclosures, Switchboards, NQOD Panelboards |
| 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 |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, Common Trip, HACR Rated |
Product FAQs
5 answersWhich panelboards and enclosures are compatible with the Q2L3125 breaker?
The Q2L3125 is designed for unit mounting and installs directly into legacy Square D NQOD panelboards, switchboards, and individual enclosures.
Is there a modern replacement for the legacy Q2L3125 circuit breaker?
Yes, the Square D PowerPact Q-frame QBL32125 is the current direct substitute. However, installing an exact Q2L3125 replacement is often preferred to preserve the original UL listing of legacy NQOD panels.
What wire sizes are accepted by the lugs on the Q2L3125?
The factory-installed lugs on this breaker accept aluminum or copper conductors ranging from 4 AWG up to 300 kcmil.
What type of trip unit is equipped on the Q2L3125?
This breaker features a non-interchangeable thermal-magnetic trip unit that provides fixed long-time (overload) and instantaneous (short circuit) protection.
How does the Q2L3125 mount into the electrical system?
It is a unit-mount, feed-thru circuit breaker that secures via mounting fasteners rather than plugging onto a busbar, making it suitable for cabled applications.
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