Eaton / Cutler-Hammer GHB2020 Molded Case Circuit Breaker

The GHB2020 is designed to bolt directly into Eaton and Cutler-Hammer Pow-R-Line C series panelboards, specifically models like the PRL1a, PRL2a, and PRL3a. It is also compatible with designated Eaton switchboards and motor control centers.

No. The 480Y/277VAC rating indicates it is strictly for use on solidly grounded wye systems where the phase-to-ground voltage is 277V. It is not rated or safe for 480V three-phase ungrounded delta applications.

The GHB2020 is rated for 14 to 10 AWG copper or aluminum wire. The correct terminal tightening torque for this specific wire range is 20 in-lbs (inch-pounds).

Yes. Eaton acquired the Westinghouse distribution equipment division, as well as Cutler-Hammer. A modern Eaton GHB2020 uses the identical G-Frame physical design and serves as a direct, interchangeable drop-in replacement for any older GHB2020 bearing the Westinghouse or Cutler-Hammer brand.

It is a branch circuit breaker that requires a bolt-on connection directly to the panelboard bus on the line side. The breaker includes pre-installed mechanical lugs on the load side to land your branch circuit wiring.

The LI designation means this thermal-magnetic breaker provides two types of protection. The Long-Time (thermal) element trips the breaker during sustained overloads, while the Instantaneous (magnetic) element trips immediately during a severe short-circuit fault. Both of these trip settings are factory-fixed on the GHB2020.

Interrupting capacity depends entirely on the system voltage. The GHB2020 can safely clear a 65,000-amp fault when installed on a 240VAC system, but its maximum fault-clearing capability decreases to 14,000 amps when operating at its maximum 480Y/277VAC rating.