Zinsco QFL23125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Plug-On
Quantity
Zinsco QFL23125 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for three-phase commercial and industrial environments, this 125A plug-on MCCB functions as a reliable main breaker. It integrates seamlessly into vintage Zinsco panelboards and switchboards, eliminating the need for complex panel upgrades or retrofits. Often cross-referenced with the UBIZ23125, this legacy component provides an exact physical match for older enclosures. The thermal-magnetic trip unit delivers standard 10kAIC protection at 240VAC, keeping classic systems operational.Specifications
| Brand | Zinsco |
|---|---|
| Part Number | QFL23125 |
| Series | QFL |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Zinsco Panelboards, 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 |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Main Breaker |
Product FAQs
5 answersWhich electrical systems are compatible with the QFL23125 circuit breaker?
This plug-in breaker is engineered specifically for legacy three phase Zinsco panelboards and switchboards. It serves as a direct replacement to maintain existing infrastructure without requiring retrofitting.
Are Sylvania and Zinsco QFL23125 breakers the same?
Yes. Sylvania manufactured these breakers under the QFL series. A breaker labeled as Sylvania QFL23125 is an exact match and fully interchangeable with the Zinsco version.
What are the conductor requirements for wiring the QFL23125?
The breaker is equipped with lugs that accommodate either aluminum or copper wire. The acceptable wire range is from 4 AWG to 300 kcmil, providing flexibility for standard 125 amp commercial applications.
How does the trip unit function on the QFL23125?
It utilizes a fixed thermal magnetic mechanism. The thermal component provides long time protection against sustained overloads, while the magnetic component offers instantaneous protection against short circuits.
Can the QFL23125 be used to upgrade a modern electrical panel?
No. This breaker is strictly intended as a replacement component for aging Zinsco or Sylvania enclosures. It is not compatible with modern panels from other manufacturers.
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