Square D FH-16020-B Single Pole Circuit Breaker

Square D FH16020-B is a 1-pole, 20-amp molded‑case circuit breaker designed for 277 VAC I‑Line panelboard installations. It uses a thermal‑magnetic trip mechanism to provide overload and short‑circuit protection and carries a 25 kA interrupting rating at 277 VAC. The device accepts 14‑4 AWG aluminum or copper conductors on the load side and uses a line‑side I‑Line connection with a phase connection suffix (the “B” in FH16020‑B). Rated for 80% continuous operation, it fits within Square D’s FH family of breakers used in industrial and commercial distribution panels to protect branch circuits such as lighting and general power at 277 VAC.