Zinsco
Zinsco UBIZ 45 A 2-pole 120/240 VAC plug-in circuit breaker
A 45 A two-pole plug-in breaker rated 120/240 VAC with a 10 kA interrupting rating for Zinsco load centers
- 45 A rating protects circuits up to 45 amps
- Two-pole design handles 120/240 V AC systems
- 10 kA interrupting rating stops fault current safely
- Plug-in mounting fits Zinsco ML12 load centers directly
- Compact 5.6 in length saves panel space
Zinsco UBIZ 45 A 2-Pole Breaker
This Zinsco UBIZ miniature circuit breaker plugs directly into compatible ML12 load centres. It provides 45 A over-current protection for single-phase 120/240 V AC branch circuits. The two-pole toggle actuator disconnects both legs simultaneously. It suits electricians and homeowners maintaining existing Zinsco panels.
Thermal and Interrupting Performance
The breaker carries a 10 kA AIR rating at 120/240 V AC for short-circuit interruption. Standard thermal-magnetic trip units respond to sustained overloads and instantaneous faults. No DC voltage rating is assigned, so use is limited to AC systems. Operating temperature range begins at 0 °F.
Lug Terminals and Compact Footprint
Plug-in mounting secures the breaker without bolts, speeding installation in ML12 series panels. Terminal lugs accept standard copper conductors for the 45 A frame. The unit measures 5.6 in long, .8 in wide and 2.5 in deep within a 125 A HACR frame size. No DC rating restricts application to AC loads only.
Highlights
- 45 A rating protects circuits up to 45 amps
- Two-pole design handles 120/240 V AC systems
- 10 kA interrupting rating stops fault current safely
- Plug-in mounting fits Zinsco ML12 load centers directly
- Compact 5.6 in length saves panel space
Specifications
| Brand | ZINSCO |
|---|
Questions about this item
How do I install this 2-pole plug-in breaker in a Zinsco ML12 load center, and what step is commonly missed?
Align the breaker with the panel bus, press firmly until fully seated, then verify the toggle moves freely; the step often missed is confirming the lug terminals are torqued to spec after seating.
What maintenance or replacement will this 45 A UBIZ breaker need over time?
No routine maintenance is required; replace the breaker if it trips repeatedly without overload, shows discoloration at the lugs, or fails to reset after a fault.
What limit appears first when this breaker runs at 45 A continuously in a 120/240 VAC circuit?
The 10 kA interrupting rating at 120/240 V AC is the first hard limit; sustained loads above 45 A will trip the thermal element before the magnetic rating is reached.
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