Square D Q12125 Molded Case Circuit Breaker
- 125A
- 2 Pole
- Plug-On
Quantity
Square D Q12125 - 125A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Quantity
Square D Q12125 - 125A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | Q12125-R |
| Series | Q1 |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Q1 Panelboards, NQO 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, Alarm Switch |
|---|---|
| Standards | UL 489, CSA C22.2 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Quantity
Square D Q12125 - 125A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Series | Q1 |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Q1 Panelboards, NQO 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, Alarm Switch |
|---|---|
| Standards | UL 489, CSA C22.2 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Description
Operating as a 2-pole thermal-magnetic device, the Q12125 delivers 125 amps of protection for legacy Square D systems. Built for residential and commercial distribution, it provides reliable overload defense for 120/240VAC networks. This plug-on MCCB mounts into Square D Q1 and NQO panelboards. When replacing this unit in NQO panels, the newer QO2125 substitute requires an SK5669 adapter. Rated at 10 kAIC, it features a Visi-Trip indicator for quick fault identification.Specifications
| Brand | Square D |
|---|---|
| Part Number | Q12125-R |
| Series | Q1 |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Q1 Panelboards, NQO 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, Alarm Switch |
|---|---|
| Standards | UL 489, CSA C22.2 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Product FAQs
6 answersWhich panelboards are compatible with the Square D Q12125 circuit breaker?
This legacy breaker is specifically designed to mount into older Square D Q1 load centers and NQO panelboards. It provides an exact physical fit for aging infrastructure that originally used the wider Q1 frame.
Can I use a modern QO breaker to replace the Q12125?
Yes, the newer QO2125 can serve as a substitute for this legacy breaker. However, if you are installing the QO2125 into an older NQO panelboard, you will need an SK5669 adapter kit to complete the installation.
Does the Q12125 require bolt-on connections?
No, this is a plug-on molded case circuit breaker. It snaps directly onto the busbar of compatible Q1 and NQO panelboards, eliminating the need for bolted connections.
Are the thermal and magnetic trip settings adjustable on the Q12125?
No, this breaker features fixed thermal and fixed magnetic trip settings. It provides standard long-time and instantaneous (LI) protection that cannot be field-adjusted.
What wire material is compatible with the terminals on this breaker?
The built-in lugs are dual-rated for both aluminum and copper conductors, accepting wire gauges from 4 AWG up to 300 kcmil.
Does the Q12125 include a Visi-Trip indicator?
Yes, this breaker features a Visi-Trip indicator that provides clear visual confirmation when the breaker has tripped, allowing for quick fault identification in the panel.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
- JTJeff T.ReviewingSquare D Q12100 - 100A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/23/18Refurbished breaker
Found the correct breaker, it was very easy to find. Great price and shipped out on time. Definitely recommend this company.