Connecticut Electric UBIF250N 50 Amp Circuit Breaker for Level 2 EV Charging
The Connecticut Electric UBIF250N is a reliable 50A 2-pole replacement breaker for FPE NA panels. ETL listed, it handles 40A continuous EV charging loads and installs cleanly without panel mods.
The Connecticut Electric UBIF250N is a 50 Amp, 2-pole, thick-series Stab-Lok breaker made to replace Federal Pacific Electric NA-style breakers. It’s an ideal choice when installing a 240V 40A Level 2 EV charger or a 40A adjusted amperage Level 2 EV charger, especially in older homes with original Federal Pacific Stab-Lok panels. This breaker is newly manufactured—not reconditioned, and is ETL listed to UL 489 for use in the U.S. and Canada.
We recommend the UBIF250N when setting up a 240V 40A EV charger on a dedicated 240V 50A circuit. It fits securely in FPE load centers designed for NA-style thick breakers. The 2-inch body plugs in cleanly without looseness or poor contact, which are common in older Federal Pacific Electric panels. With a 10,000 AIC rating, this breaker meets the safety demands of high-powered charging loads required for Level 2 EV charging.
The UBIF250N is designed to replace the original Federal Pacific Electric NA250 breaker. That makes it a plug-and-play upgrade for NEC-compliant EV charger circuits in garages, carports, or dedicated EV charging subpanels.
We also tested this breaker with the Battery Tender eCharge 40 AMP EV Charger. This NEMA 14-50 plug-in charger delivers 9.6 kW when powered through a 50A circuit and plugged in a 14-50R outlet, the Battery Tender eCharge 40 AMP EV Charger performed flawlessly with no EV charger voltage dips, no 50A dedicated EV charger circuit breaker tripping, just steady, reliable 40A continuous loads charging even on extended durations of time. The breaker handled both the 32A and 40A EV charger loads with no performance issues.
In our wiring setup, we routed two #6 AWG hot wires and a #10 ground from the breaker to the NEMA 14-50R outlet that connects the Battery Tender eCharge 40 AMP EV Charger. The EV charger circuit wires ran through ¾” PVC conduit to the NEMA 14-50R outlet. No neutral was required for the 240V-only EVSE as shown in the wiring diagram below. The circuit was tested over 40+ charging hours with the Battery Tender eCharge 40 AMP EV Charger, and the breaker held firm with zero signs of wear or EV charging instability.
Installation was quick and clean. The terminals on the UBIF250N are clamped down securely, there was no need to modify the panel, upgrade/replace the old panel, or worry about code violations—this breaker is made for FPE thick NA-style slots and installs without fuss.
This breaker is perfect for powering 9.60 kW EV chargers in homes where panel space and compatibility are tight, whether you’re using a plug-in EVSE like the Battery Tender eCharge 40 AMP EV Charger, or a hardwired 40A Level 2 Level 2 EV charger, the UBIF250N is a safe, reliable breaker option.
Top 40A Level 2 EV Chargers Compatible with the UBIF250N Breaker
Discover the best 40A EV chargers engineered to work seamlessly with the Connecticut Electric UBIF250N. These chargers deliver fast, safe, and code-compliant 240V charging for your home setup.
The Connecticut Electric UBIF250N breaker also supports adjustable 40A EV chargers (Level 2 EV Chargers) ideal for homeowners needing flexibility in high-power EV charging due to limited amperage panels without compromising safety or NEC compliance. Browse the full selection of 40A Level 2 EV Chargers.
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