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Connecticut Electric UBITBA250 50A Challenger Type A Breaker for Level 2 EV Chargers

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Connecticut Electric UBITBA250 is a new, UL-listed 50 Amp 2-pole breaker for Challenger Type A panels. Ideal for 240V 40A Level 2 EV chargers like the Mustart 9.6 kW Level 2 EV charger.

The Connecticut Electric UBITBA250 New Challenger MH250 Type-A Replacement Two Pole 50 Amp Clip Circuit Breaker is an ideal solution for replacing outdated breakers in Challenger Type-A panels – especially when installing a 240V 40A Level 2 EV charger or a 9.60 kW EV charger. This breaker is specifically designed for use in Challenger Type-A load centers and is manufactured brand new, not refurbished, by Connecticut Electric. The circuit breaker is ETL listed to UL Standard 489 and rated for 10,000 AIC, offering the reliability required for a high-load Level 2 EV charger.

Challenger Type-A breaker panels were commonly installed in homes from the 1960s through the 1980s. While they were compliant at the time, many of these panels now pose challenges due to aged busbars, loose contact points, and limited compatibility with modern UL-listed breakers. Some older breakers in these panels are known for failing to trip under fault conditions, which is why it’s critical to replace them with new safety-certified units when installing a 40 A Level 2 EV charger.

As a certified EV charger installer, I often come across Challenger panels in homes that need a safe and robust 50A circuit to support high-amperage Level 2 EV chargers. While many homeowners opt for panel upgrades or replacements, if the existing panel has enough capacity to support a 240V 40A Level 2 EV charger, the Connecticut Electric UBITBA250 2-pole 50 Amp breaker is a recommended option, Its slim, 1-inch profile and secure clip-in mounting make it a great fit for tight panels with limited space, and delivers the performance needed to safely run a 40A EV charger – such as the Mustart 40 Amp EV Charger, which we tested extensively in this setup.

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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.

We tested the UBITBA250 using the Mustart 40 Amp EV Charger installed on a dedicated 50A EV charging circuit wired with 6 AWG solid copper conductors in ¾-inch conduit (Schedule 40 PVC) from the main panel to a NEMA 14-50 outlet. The neutral and ground conductors were properly terminated at the panel’s neutral and bonded ground busbars as shown in the wiring diagram below. This circuit was built specifically to power a Mustart 40 Amp EV Charger, rated for 9.60 kW of continuous output at 240V.A detailed wiring diagram illustrating the connection of a 40A Level 2 EV charger to a single-phase Federal Pacific electrical panel, using a Connecticut Electric UBITBA250 50A 2-pole breaker in compliance with US National Electrical Code (NEC) standards. Electrical Panel (Left): Power input from the utility is shown, with L1 (Hot 1 - black wire), L2 (Hot 2 - red wire), and Neutral (N - white wire). Active lugs on the main breaker are highlighted, with a warning indicating they are always live. The main panel breaker is located at the top. The dedicated EV charger circuit breaker is a CB1-50A 2P Connecticut Electric (UBITBA250), connected to L1 and L2 busbars. The neutral busbar connects the utility neutral and the EV circuit neutral (white wire). The ground (G) busbar connects the EV circuit ground (green wire) and the main earth conductor. Electrical bonding between the neutral and ground busbars is shown. The earth conductor connects the ground busbar to an external ground rod, which is connected to Ground/Earth. A warning advises keeping branch circuit wiring neat and away from breakers and gutter posts. Wiring and Conduit (Center): Wires (L1 - black, L2 - red, N - white, G - green) run from the panel breaker (L1, L2), neutral busbar (N), and ground busbar (G) through a 3/4" conduit. Specified wiring is 6 AWG 90C Copper Wire for the EV charger circuit. A note addresses voltage drop, advising upsizing wires on long runs to maintain a voltage drop of less than 3% per NEC guidelines. EV Charger Connection (Right): The four wires (L1, L2, N, G) terminate at a NEMA 14-50 style receptacle, depicted with four prongs. An icon represents the 40A Level 2 EV charger and its plug. The text indicates a 9.6kW EV charger (240V = 40A). A prominent warning states: "40A charger needs a 50A breaker per NEC 80% rule." Overall title: "40A EV Charger Wiring Diagram with UBITBA250 Breaker - Connecting a 40A EV Charger to a Federal Pacific Panel." Includes the "Electric Vehicle Geek" logo and the label "Single Phase Panel Wiring (US-NEC)."

Over several full charging sessions – from near-empty to 80% and from 80% to full, we monitored the performance of the 50A EV charger circuit closely. There was no tripping, voltage drop, breaker hum, overheating, or contact instability experienced during our test. The UBITBA250 maintained stable power delivery across all test cycles. The breaker remained cool to the touch even after continuous 8- to 10-hour Level 2 EV charging sessions at 40 amps, showing no signs of heat or mechanical wear.

Top-Rated 40A Level 2 EV Chargers for the UBITBA250 Breaker

Looking for the best 40A Level 2 EV chargers that work seamlessly with the Connecticut Electric UBITBA250 breaker? We’ve handpicked the top chargers that deliver safe, efficient, and NEC-compliant performance at 240V, ensuring a hassle-free charging experience for your electric vehicle.

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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
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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 UBITBA250 breaker isn’t just limited to standard chargers, it’s also compatible with adjustable 40A Level 2 EV chargers. This gives you the flexibility to accommodate higher charging needs while still ensuring top-tier safety and performance. Browse our full selection of amperage adjustable 40A Level 2 EV chargers to find the perfect match for your EV charging requirements.

9Expert Score
For 240V 40A Level 2 EV charger installations—especially using a Mustart 40 Amp EV Charger or other 9.60 kW EV chargers—the UBITBA250 is a dependable, code-compliant solution. We tested it in real-world conditions, and it performed exactly as expected: solid, safe, and stable. It’s the go-to 50A breaker for anyone working with Challenger Type-A panels in need of EV-ready power.
Features
8.5
Real World Usage
9.5
Materials
9
Durability
8.5
Craftsmanship
9
Design
9
Monetary Value
9
Product Value
9
Brand Reputation
8.5
Expert Valuation
9.5
PROS
  • Narrow 1-inch width saves panel space.
  • Installs easily in Challenger Type A panels.
  • Supports 240V 40A Level 2 EV chargers.
  • New and UL-listed.
  • 10,000 AIC rating.
CONS
  • Only fits Challenger Type A panels.

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