Connecticut Electric UBITBA250 50A Challenger Type A Breaker for Level 2 EV Chargers
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New Challenger MH250 Type-A Replacement Two Pole 50 Amp Clip Circuit Breaker is an ideal solution for replacing outdated breakers in Challenger Type-A panels – especially when installing a 240V 40A Level 2 EV charger or a 9.60 kW EV charger.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.
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.
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.
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.
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