Eaton / Cutler-Hammer QBHW2030V Miniature Circuit Breaker

This bolt-on miniature circuit breaker is designed specifically for use in Eaton and Cutler-Hammer Pow-R-Line panelboards. It is not compatible with standard residential load centers that require plug-on breakers.

The "V" suffix indicates that the breaker is specially calibrated for a 50°C (122°F) ambient temperature. Standard Quicklag breakers are calibrated for 40°C. This high-ambient calibration is typically used in marine, naval, or hot industrial environments to prevent nuisance tripping.

Yes. Eaton acquired the Cutler-Hammer and Westinghouse electrical distribution lines. The current Eaton QBHW2030V is a direct, exact replacement for legacy breakers bearing the same catalog number.

While QBHW and BAB breakers share the same physical footprint and bolt-on mounting for Pow-R-Line panels, they differ in interrupting capacity. Standard BAB breakers are rated for 10kAIC, whereas the QBHW series provides a higher 22kAIC rating for systems with higher available fault current.

It utilizes a bolt-on connection type. The breaker physically bolts directly to the panelboard bus, providing a highly secure, vibration-resistant connection that is required in many commercial and industrial applications.

No. If your panel or environment requires a 50°C calibrated breaker like the QBHW2030V, using a standard 40°C breaker can lead to premature nuisance tripping due to the higher ambient heat. Always match the temperature calibration required by your specific application.

The LI designation indicates that the thermal-magnetic trip unit includes both Long-Time (thermal) and Instantaneous (magnetic) protection. The long-time function protects against sustained overloads, while the instantaneous function clears short circuits immediately.