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Connecticut Electric UBIF0250N 50 Amp Circuit Breaker for Level 2 EV Charging

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9.2
Expert ScoreRead review

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homeowners looking to upgrade to a 9.60 kW EV charger or a 240V 40A Level 2 EV charger, but their homes still rely on outdated FPE panels.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.

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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)
Deal
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.

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:This image serves as a wiring diagram titled "40A EV Charger Wiring Diagram with UBIF0250N Breaker," illustrating the connection of a 40 Amp Level 2 EV charger to a Federal Pacific single-phase 240V electrical panel, adhering to US National Electrical Code (NEC) standards. The diagram shows the main electrical panel receiving power from the utility via three wires entering the top: L1 (Hot 1, black), L2 (Hot 2, red), and N (Neutral, white). These lines connect directly to the active lugs on the main panel breaker situated at the top inside the panel enclosure. A prominent yellow warning sign highlights that these active lugs are continuously live, irrespective of the main breaker's on/off status. Inside the electrical panel, vertical busbars are shown. The incoming L1 and L2 wires feed the main breaker, which in turn feeds the hot busbars where individual circuit breakers are mounted. A Neutral Busbar is shown connected to the incoming white neutral wire. A separate Ground Busbar (labeled G) is also present. An "Electrical Bonding" connection is depicted between the neutral and ground busbars, typical for a main service panel. The Ground Busbar is connected via a green or bare copper "Earth Conductor" wire to an external "Ground Rod" driven into the "Ground/Earth," establishing the system's grounding. A dedicated circuit breaker, specified as a "CB1 - 50A 2P Connecticut Electric (UBIF0250N)", is installed in the panel specifically for the EV charger. This is a double-pole breaker, occupying two slots and connecting to both hot busbars. The wiring for the "240V EV Charger Branch Circuit" exits this dedicated breaker: a black wire (L1) from one pole and a red wire (L2) from the other pole. A green ground wire (G) is connected to the Ground Busbar. These three wires are identified as "EV Charger Circuit Wiring 6 AWG 90C, Copper Wire". They exit the panel enclosure through a fitting labeled "3/4" Conduit". An inset image shows a hand tightening this conduit fitting. A note regarding "Voltage Drop" advises upsizing wires on long runs to keep voltage drop under 3% per NEC. Another warning sign inside the panel advises to "Keep branch circuit wiring outside gutter posts and avoid crossing wires over breakers." The branch circuit wires (L1-black, L2-red, G-green, plus a white neutral wire shown heading towards the outlet, though its connection point from the neutral busbar for this specific circuit isn't explicitly drawn) are shown running towards a yellow NEMA 14-50 style electrical receptacle. Arrows indicate the direction "To EV charger (current flow)". Adjacent to the outlet is an icon representing the "40 A Level 2 EV Charger" itself, along with its charging plug. Text indicates this is a "9.6kW EV charger (240V = 40A)". A significant warning message states: "40A charger needs a 50A breaker per NEC 80% rule," explaining the use of a 50A breaker for a 40A continuous load device. The bottom of the diagram reaffirms this is for "Single Phase Panel Wiring (US-NEC)". A logo for "Electric Vehicle Geek" is in the bottom left corner.

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.

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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)
Deal
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
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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.
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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 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.

9.2Expert Score
For 240V Level 2 EV charging circuits using 40A EV chargers like the Evgoer J1772, the UBIF0250N installs securely, delivers steady performance, and handles 9.60 kW EV charger loads with ease. It’s the go-to choice for upgrading older FPE Stab-Lok panels with reliable 50A breakers—ensuring code-compliant, high-load EV charging in residential settings.
Features
9
Real World Usage
9.5
Materials
9.5
Durability
9
Craftsmanship
9
Design
9
Monetary Value
9.5
Product Value
9
Brand Reputation
8.5
Expert Valuation
9.5
PROS
  • Reliable and safe for 240V 40 A Level 2 EV chargers
  • Easy installation in Federal Pacific panels
  • High-quality copper internals for excellent conductivity
  • ETL listed and NEC compliant
CONS
  • Limited to Federal Pacific panels
  • Requires careful handling during installation

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