Zinsco QB243015 Molded Case Circuit Breaker
- 15A
- 3 Pole
- Bolt-On
Quantity
Zinsco QB243015 - 15A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for legacy commercial distribution systems, the Zinsco QB243015 is a 3-pole molded case circuit breaker rated for 15 amps. It utilizes proven thermal-magnetic trip technology to defend against electrical faults. Designed specifically for Zinsco panelboards, this bolt-on breaker ensures a seamless installation to keep older infrastructure operational. It serves as an equivalent to the UBIZ243015 substitute model.Specifications
| Brand | Zinsco |
|---|---|
| Part Number | QB243015-R |
| Series | QB |
| Amperage | 15A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | QB2430 |
|---|---|
| Terminal Type | Lugs |
| For Use With | Zinsco Panelboards |
| Wire Gauge | 14-8 AWG (Al/Cu) |
| Max Wire | 8 AWG |
| Min Wire | 14 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 | Magnetrip, Color Coded Handle (Blue), Common Trip |
Product FAQs
6 answersWhat panelboards accept the Zinsco QB243015 breaker?
This breaker is compatible with legacy Zinsco commercial and industrial panelboards designed for QB series bolt-on breakers. It is not compatible with standard plug-on residential Zinsco load centers.
Does this breaker plug onto the bus bar?
No, the QB243015 features a bolt-on connection. It must be mechanically fastened to the panelboard bus with screws or bolts, which provides a secure connection for commercial and industrial applications.
What are the wire gauge requirements for the load side lugs?
The terminals accommodate 14 AWG to 8 AWG conductors and are rated for both copper and aluminum wiring.
What type of protection does the thermal-magnetic trip unit provide?
The fixed thermal-magnetic mechanism provides dual protection: a long-time delay for standard overloads and an instantaneous trip response for short circuits.
Can this 3-pole breaker be used in a standard single-phase residential panel?
No, 3-pole breakers like the QB243015 require a 3-phase panelboard architecture. They cannot be installed in standard split-phase residential load centers.
Is it safe to install replacement breakers in legacy Zinsco panels?
While exact replacements like the QB243015 allow for the continued operation of existing panels, legacy Zinsco systems have known historical reliability issues. Many licensed electricians recommend evaluating the overall condition of the panelboard to determine if a complete system upgrade is a safer long-term solution.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
- MCMarcos C.Verified BuyerReviewingEaton / Cutler-Hammer QB1030GF - 30A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars11/20/25circuit breakers
good product and showed up on time