Industrial FDB4125 Molded Case Circuit Breaker

Westinghouse FDB4125 Industrial Molded Case Circuit Breaker is a 125 Amp, 4-pole device designed for 600 VAC systems, delivering reliable overcurrent protection in industrial power distribution. This molded case breaker is part of the FDB Frame series and is mounted on a panel or switchboard, making it suitable for installation in switchboards, motor control centers, industrial automation panels, and manufacturing equipment requiring high-amperage protection. It supports three-phase systems with neutral protection and uses thermal-magnetic protection to interrupt excessive current for both short circuits and overloads, at standard 50/60 Hz operation. The unit is widely used for branch circuit and equipment protection across power distribution assemblies, machinery, HVAC infrastructure, and automation systems within industrial and commercial facilities. Key specifications: Brand Westinghouse; Part Number FDB4125; Current Rating 125 A; Voltage Rating 600 VAC; Number of Poles 4; Breaker Series FDB Frame; Phase Compatibility: Three-phase with neutral; Protection Type: Thermal Magnetic; Application: Branch circuit and equipment protection; Frequency Rating: 50/60 Hz. It is commonly used by maintenance teams, OEMs, and electrical integrators for replacement, retrofit, and ongoing maintenance of industrial electrical infrastructure, with common replacements including Eaton FDB4125, Siemens HFD4125, and Square D FA36125.