Square D Q1L2125 Molded Case Circuit Breaker
- 125A
- 2 Pole
- Unit Mount
Quantity
Square D Q1L2125 - 125A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for reliable power distribution, the Square D Q1L2125 provides 125A of thermal-magnetic protection with a 10kAIC rating at 240VAC. It utilizes a Q-Frame unit mount design with feed-thru lug terminals, making it suitable for Q1L enclosures and various OEM panelboards. For modern retrofits, this exact frame is frequently replaced by the QOU2125. The breaker delivers fixed long-time and instantaneous (LI) protection and features a Visi-Trip indicator for quick fault identification.Specifications
| Brand | Square D |
|---|---|
| Series | Q1L |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | Q1L |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Q1L Enclosures, OEM Panels |
| Wire Gauge | 4-2/0 AWG (Al/Cu) |
| Max Wire | 2/0 AWG |
| 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 | Padlock Attachment |
|---|---|
| Accessories | Lugs (Factory Installed) |
| Standards | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Common Trip |
Product FAQs
5 answersWhat enclosures are compatible with the Q1L2125 circuit breaker?
This unit-mount breaker is designed for installation in legacy Square D Q1L enclosures and compatible OEM panels.
How does the Q1L2125 connect to the electrical system?
It features a feed-thru connection design and mounts as a standalone unit rather than plugging directly onto a panelboard busbar. The factory-installed lugs accept 4 AWG to 2/0 AWG aluminum or copper wire.
Is there a modern replacement for the legacy Q1L2125?
Yes, the Square D QOU2125 is often used as a functional substitute for modernizing infrastructure. Electricians should verify mounting configurations and space requirements for their specific OEM panel before retrofitting.
What type of trip mechanism does the Q1L2125 use?
It utilizes a fixed thermal-magnetic trip unit, providing both long-time overload protection and instantaneous short-circuit protection for 240VAC networks.
Is the Q1L2125 suitable for heating and cooling equipment?
Yes, breakers in this legacy Q-Frame family are HACR rated, making them suitable for group motor applications like heating, air conditioning, and refrigeration equipment.
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