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Connecticut Electric UBIF250N 50 Amp Circuit Breaker for Level 2 EV Charging

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9.1
Expert ScoreRead review

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.

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Battery Tender eCharge 40 AMP EV Charger - Level 2 Mounted Indoor Outdoor Fast Electric Vehicle Charging Station with Flexible 25ft Cable NEMA 14-50 - 022-3018-DL-WH
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The Battery Tender eCharge 40 AMP EV Charger is a high-performance Level 2 electric vehicle charger, designed for 240V power to deliver fast and efficient charging. Compatible with NEMA 14-50P or hardwired setups, this robust charger is perfect for both home and public use, offering reliable, high-speed charging for your EV.

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.This is a wiring diagram titled "40A EV Charger Wiring Diagram with UBIF0250N Breaker," illustrating how to connect a 40 Amp Level 2 Electric Vehicle charger to a Federal Pacific brand single-phase 240V electrical panel, following US National Electrical Code (NEC) guidelines. The diagram shows power entering the top of the main panel from the utility via three wires: L1 (Hot 1, black wire), L2 (Hot 2, red wire), and N (Neutral, white wire). These wires connect to the "Active Lugs on Main Breaker" located at the top of the panel interior. A yellow caution icon warns that these lugs remain electrically live regardless of whether the main breaker switch is on or off. Inside the electrical panel, the incoming power feeds the "Main Panel Breaker." Below the main breaker are vertical busbars where circuit breakers are installed. A "Neutral Busbar" is shown connected to the incoming neutral wire. A separate "G (Ground Busbar)" is also depicted. An "Electrical Bonding" jumper connects the Neutral Busbar to the Ground Busbar, which is standard practice in a main service panel. The Ground Busbar is connected via a green wire labeled "Earth Conductor" to an external "Ground Rod" driven into the "Ground/Earth," establishing the safety ground for the system. A specific circuit is set up for the EV charger using an "EV Charger Dedicated Circuit Breaker" identified as a "CB1 - 50A 2P Connecticut Electric (UBIF0250N)". This is a double-pole breaker, connecting to both hot busbars. The "240V EV Charger Branch Circuit" wiring exits this breaker. It consists of L1 (black wire), L2 (red wire), N (Neutral, white wire - though its connection to the neutral busbar isn't explicitly drawn, it's labeled as part of the circuit), and G (Ground, green wire connected to the Ground Busbar). These wires are specified as "EV Charger Circuit Wiring 6 AWG 90C, Copper Wire". The wires exit the panel through a "3/4" Conduit" fitting, shown being tightened by a hand in an inset photo. A note advises to upsize wires on long runs to mitigate "Voltage Drop" and keep it under 3% per NEC. Another caution sign advises keeping branch circuit wiring away from gutter posts and avoiding crossing wires over breakers inside the panel. The branch circuit wires (black, red, white, and green) are shown running towards a yellow NEMA 14-50 style receptacle, labeled "To EV charger (current flow)". To the right, an icon represents the "40 A Level 2 EV Charger" with its plug. This charger is noted as providing "9.6kW (240V = 40A)". A crucial yellow warning sign below this states, "40A charger needs a 50A breaker per NEC 80% rule," explaining why a 50A breaker is used for a 40A continuous load device. The bottom right confirms the diagram depicts "Single Phase Panel Wiring (US-NEC)". The logo for "Electric Vehicle Geek" appears in the bottom left corner.

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.

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EG evgoer Level 2 EV Charger, 40A 240V Portable EV Home Charging Station, Schedule Time 8-40A Adjustable Current Electric Vehicle Charger Compatible with All J1772 EVs (20 ft)
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Evgoer J1772 40A Level 2 EV Charger delivers fast, safe charging with an adjustable 8A-40A current. The 20ft cable ensures flexibility. IP66's waterproof design supports indoor and outdoor use. Compatible with all J1772 electric vehicles.
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Battery Tender eCharge 40 AMP EV Charger - Level 2 Mounted Indoor Outdoor Fast Electric Vehicle Charging Station with Flexible 25ft Cable NEMA 14-50 - 022-3018-DL-WH
Deal
The Battery Tender eCharge 40 AMP EV Charger is a high-performance Level 2 electric vehicle charger, designed for 240V power to deliver fast and efficient charging. Compatible with NEMA 14-50P or hardwired setups, this robust charger is perfect for both home and public use, offering reliable, high-speed charging for your EV.
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MUSTART Level 2 EV Charger, 40 Amp, 240 Volt, 25ft Cable, Electric Vehicle Portable Charger Plug-in EV Charging Station with NEMA 14-50P, ETL Certificated
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The Mustart 40 Amp EV Charger delivers fast 240V charging with a 25-foot cable and NEMA 14-50P plug for easy installation. ETL-certified for safety, this portable plug-in station is ideal for home use, providing reliable, high-speed charging for all-electric vehicles with convenience and efficiency.
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Enphase 32 Amp Plug-in EV Charger, HCS-40 with NEMA 14-50 Plug (Formerly ClipperCreek): 7.7kW Power, 5-Year Warranty, 25 ft Cable, J1772 Ruggedized Connector
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The Enphase 32 Amp Plug-in EV Charger (HCS-40) with NEMA 14-50 plug offers 7.7kW power for fast, reliable charging. Featuring a durable 25 ft cable and J1772 ruggedized connector, it ensures compatibility with all EVs. Backed by a 5-year warranty, this charger provides robust, long-term performance for home use.
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JuiceBox 40 Smart Electric Vehicle (EV) Charging Station with WiFi - 40 amp Level 2 EVSE, 25-Foot Cable, UL & Energy Star Certified, Indoor/Outdoor Use (NEMA 14-50 Plug, Gray)…
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The JuiceBox 40 Smart EV Charging Station delivers 40 amps of Level 2 charging with a 25-foot cable and NEMA 14-50 plug. UL and Energy Star certified, it provides efficient, safe charging for both indoor and outdoor use. WiFi connectivity enables smart features for optimized performance and energy management.
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Wallbox Pulsar Plus Level 2 Electric Vehicle Smart Charger - 40 Amp, Ultra-Compact, WiFi, Bluetooth, Alexa/Google Home, UL Certified, 25ft Cable, Indoor/Outdoor EVSE, Assembled in USA
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The Wallbox Pulsar Plus 40 Amp Level 2 EV Charger is an ultra-compact, smart charging solution with WiFi, Bluetooth, and voice control via Alexa/Google Home. Featuring a 25ft cable, it’s UL-certified for safety and suitable for both indoor and outdoor use. Assembled in the USA for reliable performance.

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.

9.1Expert Score
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.
Features
9
Real World Usage
9.5
Materials
9.5
Durability
9
Craftsmanship
9
Design
9
Monetary Value
9
Product Value
9
Brand Reputation
8.5
Expert Valuation
9.5
PROS
  • Plug-and-play fit for thick-style FPE Stab-Lok NA panels.
  • Supports continuous 40A loads with zero nuisance tripping.
  • ETL listed to UL 489—certified for North American safety.
  • Installs cleanly without modifying legacy panels.
CONS
  • Only fits thick-series NA-style FPE breakers—limited compatibility.
  • Does not support AFCI or GFCI protection out-of-the-box.
  • Pricier than other 50A circuit breakers from the same brand.

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