Overview
The Siemens 42CF35AF is a Class 42 definite purpose contactor designed by Furnas for OEM and industrial switching applications. This 40-ampere, 3-pole unit provides reliable electrical control in HVAC systems, refrigeration units, compressors, fans, blowers, and pump-driven equipment. The contactor is rated for 120V AC coil operation at 50/60 Hz and comes with a metal base mount for secure installation in control panels or standalone enclosures.
Key Features
- 40-ampere maximum load rating across three poles
- 120V AC coil voltage (110V 50 Hz, 120V 60 Hz compatible)
- 3-pole electrically held switching for motor and load control
- Double quick-connect terminals for simplified wiring and fast replacement
- Metal base mount included for panel and open mounting
- Class 42 Furnas definite purpose design—proven in OEM equipment for decades
Technical Specifications
- Poles: 3 (three power contacts)
- Amperage: 40A maximum load, 50A resistive current per pole
- Coil Voltage: 120V AC, 50/60 Hz (110V 50 Hz, 110–120V 60 Hz)
- Horsepower Rated: 3 HP (120V), 7.5 HP (240V), 10 HP (480V), 20 HP (600V)
- Terminal Type: Double quick-connect
- Mounting: Metal base mount
- Operating Temperature: Ambient air 40°C (104°F) standard
- UPC: 783087144958
Typical Applications
The 42CF35AF excels in definite-purpose switching for:
- HVAC and air-conditioning systems
- Refrigeration and walk-in cooler controls
- Pump and compressor motor starters
- Fan and blower speed control
- Conveyors and material handling equipment
- Lighting and power distribution circuits
- Pool and spa pump controls
- Welding equipment and industrial ovens
Compatibility & Replacements
Compatible With
- Siemens / Furnas Class 42 and Class 45 definite purpose contactors
- Standard 3-pole motor contactor control circuits
- 120V AC single-phase and three-phase coil systems
- OEM HVAC and refrigeration control assemblies
- Industrial electrical enclosures and control panels rated for 120V AC coil voltage
Replaces / Drop-In Replacement For
The 42CF35AF directly replaces other Furnas Class 42 40A 3-pole definite purpose contactors with identical 120V AC coil and quick-connect terminal configuration. Verify your existing unit’s coil voltage and horsepower rating before ordering to ensure compatibility.
Works With
- Siemens / Furnas definite purpose contactor lineups (Class 42, Class 45 series)
- 120V AC control transformer circuits
- Standard motor overload relays and protection devices
- Commercial and industrial control system wiring schemes
- Quick-connect terminal wiring harnesses and male pin connectors
