The Eaton GFCBB120 miniature circuit breaker, from the Cutler-Hammer NSB family, is a 1‑pole, 20‑amp device designed for 50/60 Hz electrical systems. As a GFCBB120 model, it sits within Eaton’s NSB MCB lineup and is configured to protect a single branch circuit in compatible panels. Identified by the GFCBB120 part name, this compact 1‑pole breaker provides a standard solution for panel installations requiring a 20‑amp protective device.
