Westinghouse NSB FB3045SMRL Molded Case Breakers (MCCBs)

Description:

The Westinghouse NSB FB3045SMRL Molded Case Breaker is a molded case circuit breaker used in industrial electrical distribution and branch circuit protection systems. Commonly installed in motor control centers, switchboards, industrial automation panels, and manufacturing equipment requiring reliable three-phase overcurrent protection. Maintenance teams, OEMs, and electrical integrators use this breaker for replacement, retrofit upgrades, and maintenance of existing industrial electrical infrastructure.

Applications:

The Westinghouse FB3045SMRL molded case breaker is commonly used in industrial and commercial electrical systems where dependable branch circuit protection is required for medium-amperage three-phase equipment and connected power systems. It is suitable for motor control systems, conveyor equipment, HVAC infrastructure, automation machinery, industrial processing systems, and electrical distribution panels operating in demanding industrial environments.

Technical Specifications:

• Brand: Westinghouse
• Part Number: FB3045SMRL
• Product Type: Molded Case Circuit Breaker (MCCB)
• Breaker Series: FB Frame
• Current Rating: 45 Amp
• Number of Poles: 3 Pole
• Protection Type: Thermal Magnetic
• Application: Branch circuit and equipment protection
• Mounting Style: Panel or switchboard mounted
• Function: Overcurrent and short-circuit protection
• Industrial Use: Power distribution and motor control systems
• Phase Compatibility: 3 Phase
• Frequency Rating: 50/60 Hz
• Typical Installation: MCCs, switchgear, industrial control panels
• Condition Notes: NSB (New Surplus Box)

Common Replacements:

• Eaton FB3045
• Siemens HFB3045
• Square D FA3445