Westinghouse 4975D71G5 Molded Case Circuit Breaker

The Westinghouse FB3020 style 4975D71G5 molded case circuit breaker is a 20‑amp, 600‑VAC three‑pole device built for industrial power distribution. As part of the FB Frame family, it provides thermal magnetic overcurrent protection for three‑phase circuits in motor control centers, industrial switchboards, automation panels, and other manufacturing equipment requiring reliable branch‑circuit and equipment protection. Rated for 50/60 Hz operation, this molded case breaker mounts in panel or switchboard installations and is designed for use where motor loads and process equipment demand fast, dependable interruption during overcurrent or short‑circuit events. Key specifications include: Brand Westinghouse; Part Number FB3020; Style Number 4975D71G5; Current Rating 20 A; Voltage Rating 600 VAC; Number of Poles: 3; Phase Compatibility: 3 Phase; Breaker Series: FB Frame; Protection Type: Thermal Magnetic; Application: Branch circuit and equipment protection; Frequency Rating: 50/60 Hz. Common replacements in industrial practice include Eaton FB3020, Siemens HFB3020, and Square D FA3420, reflecting the breaker's role in power distribution and motor control schemes.