Zinsco Q243020 Molded Case Circuit Breaker
- 20A
- 3 Pole
- Plug-On
Quantity
Zinsco Q243020 - 20A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
A drop-in replacement for older Zinsco and GTE Sylvania load centers, the Q243020 restores safe power distribution without requiring panel modifications. This 3-pole, 20-amp molded case circuit breaker features a distinctive red color-coded handle for quick visual identification. Rated for 10kAIC at 240VAC, it utilizes proven thermal-magnetic trip technology to defend commercial circuits. It serves as an exact-fit alternative to the UBIZ243020 substitute breaker.Specifications
| Brand | Zinsco |
|---|---|
| Part Number | Q243020-R |
| Series | Q |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Zinsco Load Centers |
| Wire Gauge | 14-10 AWG |
| Max Wire | 10 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Standards | UL 489 |
|---|---|
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Magnetrip, Color Coded Handle (Red), Common Trip |
Product FAQs
6 answersWhat load centers are compatible with the Zinsco Q243020 circuit breaker?
This breaker is designed as a direct plug-on replacement for older Zinsco and GTE Sylvania load centers that accept Q-series breakers.
Is there a modern aftermarket replacement for the Q243020?
Yes, the Connecticut Electric UBIZ243020 is a newly manufactured, exact-fit substitute for this 3-pole, 20-amp Zinsco breaker.
What does the red handle on this Zinsco breaker indicate?
Zinsco utilized a color-coded handle system for quick visual identification during maintenance. A red handle specifically denotes a 20-amp rating.
How many panel spaces does the Q243020 require?
As a 3-pole breaker, it requires three standard spaces on the busbar of a compatible Zinsco load center.
Can I install the Q243020 in a modern Square D or Siemens panel?
No. This breaker features a proprietary plug-on clip design that is strictly compatible with Zinsco and GTE Sylvania busbars. It will not fit panels from other manufacturers.
Are there known safety concerns with legacy Zinsco panels?
Yes. Zinsco equipment has a documented history of reliability issues, including breakers failing to trip during overcurrent events and poor busbar connections that can cause arcing or overheating. Many electricians recommend full panel replacement when feasible.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 47 reviews.
- CGCrocefissa G.Verified BuyerReviewingSiemens Q115 - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Quick delivery and great price.
The circuit breakers are at a great cost.
- JBJason B.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Great experience
The product was exactly what I needed and it arrived on time.
- DQDon Q.Verified BuyerReviewingSiemens Q3100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/14/26Siemens breaker
Great customer experience, great prices and fast shipping... Definitely will be buying her again.
- CSChristopher S.Verified BuyerRated 5 out of 5 stars8/12/26Siemens 60
Perfect new condition
- GSGeorge S.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/4/26Great service
Every time I call or go online you have the parts I'm looking for.