Eaton / Cutler-Hammer QC3090H Miniature Circuit Breaker

It is designed for use in Eaton Quicklag panelboards, industrial control panels, and custom enclosures. It can also be mounted on a standard 35mm DIN rail when paired with the appropriate adapter.

This is a cable-in/cable-out, or feed-through, breaker. It features factory-installed box lugs on both the line and load sides for direct wire connections, eliminating the need for a busbar connection. It can be surface-mounted or DIN rail-mounted using an adapter.

Yes. In addition to its AC ratings, this breaker is rated for DC applications. It provides a 5 kAIC interrupting capacity at 48VDC and 3.8 kAIC at 62.5VDC, making it suitable for specific control and battery circuits.

The load lugs on the QC3090H accept 8 AWG to 1/0 AWG aluminum or copper wire. Always verify that your selected wire gauge meets National Electrical Code (NEC) requirements for a 90-amp circuit based on insulation temperature and run length.

Yes. Eaton acquired Cutler-Hammer, and the QC3090H is the exact same Quicklag series breaker under both brand names. It may also be found under the legacy Westinghouse brand.

No, the QC3090H is a standard thermal-magnetic circuit breaker providing overload and short-circuit protection. It does not include Ground Fault Circuit Interrupter (GFCI) or Arc Fault Circuit Interrupter (AFCI) functionality.

Thermal-magnetic breakers like the QC series can generally be mounted vertically or horizontally without affecting their trip characteristics. However, always ensure the ON and OFF markings are clearly visible and comply with NEC 240.81, which requires the ON position to be up when mounted vertically.

The LI code indicates that the breaker features Long-Time and Instantaneous trip functions. The long-time function protects against sustained overloads, while the instantaneous function provides immediate tripping during a short-circuit event.

No, this breaker features fixed thermal and fixed magnetic trip settings. It cannot be adjusted in the field to alter the trip curve or amperage rating.