Connecticut Electric UBIF0250N 50 Amp Circuit Breaker for Level 2 EV Charging
The Connecticut Electric UBIF0250N is a 50A, 2-pole circuit breaker designed for Federal Pacific Electric panels. It ensures reliable performance for 240V 40 A Level 2 EV chargers, offering safety and compliance with NEC standards.
The Connecticut Electric UBIF0250N is a 50 Amp, 2-pole, thin-series Stab-Lok circuit breaker I recommend for installing 240V 40A Level 2 EV chargers or amperage adjusted Level 2 EV chargers that support 40A adjustments – especially for installation in older homes with original Federal Pacific Electric (FPE) load centers that still use Stab-Lok breaker panels.
As an EV charger installer, I often run into homeowners looking to upgrade to a 9.60 kW EV charger or a 240V 40A Level 2 EV charger, but their homes still rely on outdated FPE panels. Replacing the panel isn’t always feasible, and that’s where the UBIF0250N becomes the ideal solution. This breaker is newly manufactured, not refurbished or salvaged by Connecticut Electric, and it’s ETL listed to UL Standard 489 for both the U.S. and Canada. It’s a safe, compliant choice when wiring EV charging circuits for a 40A EV charger in legacy FPE panels.
The UBIF0250N is classified as a direct replacement for the FPE NC250 thin-style 2-pole breaker, making it fully compatible with older Stab-Lok panels. This eliminates the guesswork during installs and helps ensure compliance with NEC requirements for residential EV charging. Its 10,000 AIC interrupt rating adds another layer of safety and reliability when wiring circuits in older homes with limited electrical upgrades.
We tested the UBIF0250N on a dedicated 50A plug-in EV charger branch circuit using a NEMA 14-50 outlet and an Evgoer J1772 40A EV Charger, rated for a full 9.60 kW EV charging load at 240V.
We installed the UBIF0250N in a dedicated 50A EV charging circuit with a NEMA 14-50R outlet housed in a NEMA 14-50 weatherproof cover. The circuit used 6 AWG solid copper THHN conductors in ¾-inch conduit, with grounding bonded to the panel’s busbar as shown in the wiring diagram below:
Installation into the original Federal Pacific Electric (FPE) Stab-Lok panel was seamless, the breaker snapped firmly into place, avoiding the loose fit common with many aftermarket replacements.
Its plug-in design suitable for DIY 40 A EV charger installations created a secure connection, and the high-quality copper internals handled the 9.60 kW EV charger load from our 240V 40A Level 2 EV charger without the 50A EV charger circuit breaker tripping, heat buildup, or voltage drop. Over 25–30 full charging sessions using the Evgoer J1772 40A EV charger – including overnight charges in high ambient temperatures – the breaker delivered a stable, uninterrupted performance with no chatter or thermal fatigue. That kind of consistent, cool operation is especially critical in older Federal Pacific panels, which are known for contact degradation and reliability issues under sustained high-current loads.
Recommended 40A Level 2 EV Chargers for UBIF0250N Breaker
Here’s a list of top-rated 40A Level 2 EV chargers that pair perfectly with the Connecticut Electric UBIF0250N breaker, providing safe, efficient, and NEC-compliant charging at 240V.
The Connecticut Electric UBIF0250N breaker is also compatible with adjustable 40A Level 2 EV chargers, offering flexibility for higher charging demands while maintaining safety and efficiency. Explore the full list of 40A Adjustable Level 2 EV Chargers.
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