ABB / General Electric TJJ436300 Molded Case Circuit Breaker

This J-Frame breaker is designed to mount in GE A-Series panelboards, Spectra Series switchboards, and GE motor control centers. For standalone applications, it requires a compatible GE J-Frame enclosure.

The standard mechanical lugs accept either a single conductor ranging from 6 AWG to 600 kcmil or dual conductors ranging from 2/0 AWG to 250 kcmil. Both aluminum and copper (Al/Cu) wires are supported.

The TJJ436300 features a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short-circuit protection. The magnetic trip dial allows you to set the instantaneous pickup threshold to coordinate with specific load requirements or downstream devices.

Yes, this J-Frame breaker is suitable for reverse feed applications. Because it does not have dedicated line and load markings, it can be back-fed to serve as a main breaker, provided you install the appropriate retaining bracket or hold-down kit required by the NEC.

This unit is part of the legacy GE J-Frame molded case circuit breaker family. Following ABB's acquisition of GE Industrial Solutions, these breakers may carry either GE or ABB branding depending on the manufacturing date, but they are physically and electrically identical.

The LI designation indicates that the thermal-magnetic trip unit provides Long-Time (L) and Instantaneous (I) protection. The fixed long-time function protects against sustained overloads, while the adjustable instantaneous function trips the breaker immediately during a short-circuit event.

This is a bolt-on circuit breaker. It secures directly to the panelboard bus using bolted connections, providing a secure, vibration-resistant connection suitable for commercial and industrial environments.