ABB / General Electric TJJ436400 Molded Case Circuit Breaker

This J-Frame breaker installs directly into GE A-Series panelboards, Spectra Series switchboards, standalone J-Frame enclosures, and compatible motor control centers.

The standard terminal lugs accept either one conductor from 6 AWG to 600 kcmil, or two conductors from 2/0 AWG to 250 kcmil. Both aluminum and copper wiring are permitted.

The thermal long-time overload setting is fixed at 400 amps. However, the instantaneous magnetic short-circuit trip is adjustable via a dial on the front cover to coordinate with downstream protection devices.

TJJ breakers have a standard 30kA interrupting capacity at 480VAC. The TJK and THJK series share the exact same physical J-Frame dimensions and mounting footprint but are built to handle higher available fault currents.

ABB acquired GE Industrial Solutions in 2018. Legacy GE product lines, including the J-Frame molded case circuit breakers, are now manufactured and supported under the ABB brand name.

Yes, auxiliary contacts, shunt trips, and undervoltage releases can be field-installed. This is accomplished by removing the front cover and inserting the modules into the designated accessory pockets inside the breaker frame.

Standard GE thermal-magnetic J-Frame breakers can generally be reverse fed. They do not have directional dependencies for line and load connections unless specifically stamped with line/load side markings on the casing.