Overview
The Eaton Cutler-Hammer FDB3045L is an industrial-grade molded case circuit breaker engineered for three-phase power distribution. This Series C breaker delivers fixed thermal and magnetic trip protection at 45 amperes, supporting 600 volts AC and 250 volts DC. The FDB3045L combines proven durability with straightforward field installation, making it a standard choice for machinery control centers, power panels, and backup protection systems across manufacturing, mining, and utility applications.
Key Features
- 45A Rated Current — Fixed thermal-magnetic trip unit with responsive protection at 40°C ambient
- Dual Voltage Rating — 600 VAC and 250 VDC enables flexibility in DC-backup and hybrid power systems
- 3-Pole Configuration — Symmetric three-phase breaking for balanced load protection
- F-Frame Size — Compact footprint fits standard Series C mounting hardware and panel layouts
- Load-Side Terminals — Standard pressure lugs simplify installation and ensure tight connections
- Non-Interchangeable Trip Unit — Factory-set protection reduces field misconfiguration risk
Technical Specifications
- Manufacturer: Eaton Corporation (Cutler-Hammer division)
- Part Number: FDB3045L
- Poles: 3
- Current Rating: 45 Amperes
- Voltage Rating: 600 VAC; 250 VDC
- Frequency: 50/60 Hz
- Trip Type: Thermal-Magnetic (Fixed)
- Interrupting Capacity (Typical): 14 kAIC at 480 VAC; 18 kAIC at 240 VAC
- Operating Temperature: 40°C rated
- Frame Size: Frame F (F-Frame)
- Terminal Style: Load-side pressure terminals
- Actuator Type: Handle
- Weight: Approximately 4.5 lbs
- Dimensions: Approximately 4.13″ W × 3.38″ D × 6″ H
- Standards & Certifications: UL 489, CSA C22.2 No. 5, IEC 60947-2, NEMA AB1
Typical Applications
The FDB3045L is commonly deployed in the following scenarios:
- Industrial Machinery — Main and branch protection in machine tool centers and assembly lines
- Power Distribution Panels — Three-phase motor and feeder circuit protection in main service equipment
- Backup and Standby Systems — DC voltage compatibility supports 250 VDC battery backup systems in mission-critical facilities
- Heavy Manufacturing — Automotive, aerospace, and metal fabrication plants requiring robust overcurrent protection
- Utility and Infrastructure — Substation switching and remote power distribution equipment
Compatibility & Replacements
Compatible With
- Eaton Series C molded case circuit breaker mounting hardware and enclosures
- Standard three-phase 600V industrial power distribution systems
- DC systems rated for 250 volts (battery backup, renewable energy systems)
- Thermal-magnetic protection schemes in 45A–60A range applications
- Load centers and switchboards accepting F-frame breakers
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The FDB3045L may interchange with other Eaton Series C 45A 3-pole units of the same frame size (FDB, FD, HFD variants), but always confirm against original equipment documentation and interrupting capacity requirements.
Works With
- Eaton/Cutler-Hammer enclosure and busway systems
- Standard industrial control panels and MCC (Motor Control Center) layouts
- Shunt trips and auxiliary switches (field-installable options)
- Rating plugs and adjustable trip units (if supported by specific variant)
- Line and load lug terminals for flexible conductor sizing
