Eaton C25DNF340T (42CF35AJ) Contactor

The Eaton C25DNF340T is a heavy-duty 3-pole definite purpose contactor engineered for rigorous HVACR and industrial motor control applications. This unit features a 40A inductive full load rating and a 50A resistive rating, making it a reliable physical and electrical cross-reference for the Siemens/Furnas 42CF35AJ. Designed with a 24VAC control coil, the C25DNF340T utilizes double-break contacts and a Class B magnetic coil to ensure consistent switching under high-cycle demands. The open frame design includes a metal mounting plate and versatile box lug terminals with side-by-side quick-connects, facilitating straightforward integration into existing control panels. Built for longevity, the housing is designed to limit dust and contaminant ingress, reducing common vibration issues and mechanical "chattering." This 40 amp 3 pole contactor is a critical component for compressors, motors, and resistive heating loads where performance and specification matching are non-negotiable for field technicians.

• High Amperage Capacity: Rated for 40A inductive and 50A resistive loads to handle demanding compressor and fan motor startups.
• Direct Cross-Reference: Serves as a precise substitute for the 42CF35AJ, ensuring total compatibility with existing electrical footprints and 24V coil signals.
• Flexible Connectivity: Features box lugs with side-by-side quick connects, allowing for fast field wiring and secure terminations.
• Contaminant Resistance: Optimized housing protects the internal magnet structure from dust, significantly reducing operational noise.
• Industrial Durability: Robust metal mounting base and double-break contact design extend the service life in high-cycle HVACR environments.

Can I use this contactor to replace a 30A or 35A unit?
Yes. While you should never downsize amperage, the Eaton C25DNF340T can safely replace contactors with lower amperage ratings, provided the 24V coil voltage and 3-pole configuration are identical.

Why is my contactor making a loud buzzing or chattering noise?
Chattering is typically caused by low control voltage (less than 24V) reaching the coil or debris trapped between the contacts. Verify your transformer output and check for pitted contacts or pest intrusion.

Is the 42CF35AJ a direct match for this part?
The 42CF35AJ shares the same 3-pole, 40A, 24V specs as the C25DNF340T. Always verify the terminal type and physical dimensions to ensure a smooth drop-in replacement.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.