Zinsco QB243060 Molded Case Circuit Breaker
- 60A
- 3 Pole
- Bolt-On
Quantity
Zinsco QB243060 - 60A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Facility managers relying on older distribution networks will appreciate this exact-fit 60A three-pole breaker. Manufactured for 240VAC commercial applications, it provides dependable protection for legacy Zinsco panelboards. Designed to eliminate compatibility guesswork, the bolt-on mounting style fastens into original busbars without modification. The unit incorporates Zinsco's proprietary Magnatrip technology and a white handle, delivering a 10kA short-circuit current rating for safety.Specifications
| Brand | Zinsco |
|---|---|
| Series | QB |
| Amperage | 60A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Zinsco Panelboards |
| Wire Gauge | 14-4 AWG (Al/Cu) |
| Max Wire | 4 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 | Magnatrip, Color Coded Handle (White) |
Product FAQs
5 answersWhat type of panelboards are compatible with the QB243060?
As a 3-pole breaker, it is designed for 3-phase legacy Zinsco panelboards that accept QB-series bolt-on frames. It cannot be used in standard single-phase residential load centers.
How does the bolt-on connection work for this Zinsco breaker?
Unlike plug-on residential breakers that snap into place, this unit must be mechanically fastened directly to the panelboard busbar using screws. This ensures a secure, high-amperage connection that resists vibrating loose over time.
What is the maximum fault current this breaker can handle?
The QB243060 has a maximum interrupting rating of 10kAIC at 240VAC. It must not be installed in commercial or industrial systems where the available fault current exceeds 10,000 amps.
Does the QB243060 offer arc fault or ground fault protection?
No, this is a standard thermal-magnetic breaker equipped with long-time and instantaneous (LI) trip functions for basic overload and short-circuit protection. It does not contain AFCI or GFCI safety circuitry.
Are Zinsco QB series breakers still manufactured?
Zinsco is a legacy electrical brand, meaning original OEM production has ended. Sourcing this exact QB243060 frame requires finding specialized inventory to safely maintain existing Zinsco infrastructure without performing a full panel upgrade.
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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