Overview
The Furnas 42EF35AJ is a Class 42 definite purpose contactor designed for reliable motor control in industrial and HVAC applications. This 3-pole unit is rated for 60A continuous load current and operates from a 24VAC 50/60Hz coil, making it ideal for machinery requiring precise switching in fixed-duty cycles such as compressors, pumps, and fan motors.
Key Features
- 3-pole configuration for 3-phase motor control
- Silver-cadmium oxide contacts for reliable arc suppression and extended contact life
- Double quick-connect coil terminals plus screw terminals for flexible wiring arrangements
- Side attachment rails for optional Furnas or MARS 780 auxiliary switches
- Thermoset polyester insulation (Class F) rated for 600V operation
- Metal base or DIN rail mounting options available
- Recessed push-to-test button for coil verification (standard on select models)
Technical Specifications
- Poles: 3
- Maximum Load Current: 60A continuous
- Coil Voltage: 24VAC
- Frequency: 50/60Hz
- Contact Material: Silver-cadmium oxide
- Voltage Rating: 600V
- Horsepower Ratings: 20 HP @ 240V, 40 HP @ 480V, 40 HP @ 600V
- Operating Temperature Range: –40°C to +65°C
- Enclosure Type: Open
- Mounting: Base mount or DIN rail compatible
- Insulation Class: F (Class F coils)
- Series/Classification: Class 42 Definite Purpose
Typical Applications
- HVAC equipment (air handlers, compressor units)
- Centrifugal and reciprocating pumps
- Industrial fan motors and blowers
- Chiller and refrigeration compressor control
- Fixed-duty motor starter circuits requiring non-reversing control
Compatibility & Replacements
Compatible With
- Furnas/MARS auxiliary switch systems (MARS 780 series)
- Class 42 motor control circuits rated 240–600V
- 24VAC control systems and pilot devices
- Standard 3-phase motor starters and soft-start equipment
- IEC and NEMA contactor-based control panels
Replaces / Drop-In Replacement For
- Furnas/Siemens 42EF35AJ original equipment
- MARS (Siemens subsidiary) equivalent motor control units
- Eaton C25FNF360T (modern replacement where Furnas units are obsolete)
Works With
- Electromechanical relay-based control circuits
- 24VAC control transformers and pilot devices
- Auxiliary contact blocks (30A and 60A models support side-mounted switches)
- Standard industrial push-button, selector switch, and thermostat inputs
- HVAC system controllers and compressor protection modules
