Cutler Hammer QOB250 Bolt-on Circuit Breaker 50A 2P 240V

Product Description

The CUTLER HAMMER QOB250 is a 2-pole, bolt-on thermal magnetic circuit breaker rated for 50 amps at 120/240 volts. It is designed to provide overcurrent and short-circuit protection in residential and light commercial panelboards that accept bolt-on style breakers. The thermal magnetic trip mechanism responds to both sustained overloads and instantaneous fault currents, protecting downstream wiring and connected equipment. Lug terminals accommodate aluminum or copper conductors ranging from 8 AWG to 2 AWG. Licensed electricians install this breaker during new construction, panel upgrades, or branch circuit replacement work.

The QOB250 is suited for 240-volt branch circuits in residential and light commercial applications, including HVAC equipment feeds, water heater circuits, subpanel feeders, and similar double-pole loads. Its bolt-on mounting style is required in panelboards specifically designed for bolt-on breakers, as opposed to plug-on configurations. The 10 kilo-amp interrupting rating is appropriate for typical residential and small commercial service entrance fault current levels.

Key Features

• 50-amp current rating for double-pole 240-volt branch circuits
• Thermal magnetic trip mechanism provides overload and short-circuit protection
• Bolt-on mounting style for compatible panelboards
• Lug terminals accept aluminum or copper wire from 8 AWG to 2 AWG
• 10 kilo-amp interrupting rating suitable for residential and light commercial panels
• 2-pole design handles 120/240-volt single-phase loads

Compatibility

Designed as a bolt-on style replacement circuit breaker for panelboards that accept bolt-on two-pole breakers in the QOB series configuration.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize the panel and verify the absence of voltage with a meter before handling any breaker or wiring connections. Confirm that the panelboard is rated for bolt-on breaker installation before proceeding. Torque all lug connections to the value specified on the panelboard's labeling or the breaker's documentation.