Zinsco Q243070 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Plug-On
Quantity
Zinsco Q243070 - 70A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Restoring functionality to aging infrastructure, the Q243070 is a three-pole 70A breaker built for commercial applications. It utilizes the classic Magnetrip thermal-magnetic mechanism for reliable overload protection. This plug-on unit mounts into original Zinsco panelboards, providing a seamless fit for discontinued systems. It serves as an authentic alternative to aftermarket substitutes like the UBIZ370. Rated for 10kA at 240VAC, it features a distinctive black color-coded handle.Specifications
| Brand | Zinsco |
|---|---|
| Part Number | Q243070-R |
| Series | Q |
| Amperage | 70A |
| 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 | 4-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 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 |
Product FAQs
5 answersWhat panels are compatible with the Zinsco Q243070?
This 3-pole breaker is designed specifically for legacy Zinsco load centers and panelboards that accept Type Q plug-on circuit breakers.
What wire gauge is required for the lugs on this 70A breaker?
The terminal lugs on the Q243070 accommodate 4 AWG to 1/0 AWG wire and are compatible with both copper (Cu) and aluminum (Al) conductors.
Is there an aftermarket replacement for the Zinsco Q243070?
Yes, Connecticut Electric manufactures the UBIZ370, which serves as a direct aftermarket replacement for this 70-amp, 3-pole Zinsco breaker.
What type of protection does the Q243070 provide?
It features a fixed thermal-magnetic trip mechanism that delivers long-time response for overloads and instantaneous response for short circuits, with a 10kAIC rating at 240VAC.
Does this breaker require bolting to the busbar?
No, the Q243070 features a plug-on mounting design that pushes directly onto the busbar of compatible Zinsco panels without the need for mounting screws.
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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.