Hartland Controls CON-3/24/75 Contactor

The Hartland Controls CON-3/24/75 is a heavy-duty 3-pole definite purpose contactor engineered for high-demand commercial HVACR and industrial applications. Built to handle a 75-amp inductive load and up to 90 amps resistive, this component is frequently used for controlling large compressors, condenser fans, and resistive heating elements in rooftop units and chillers. Operating with a 24Vac 50/60Hz coil voltage, it features silver cadmium oxide contacts to maintain superior conductivity and minimize pitting under high switching frequencies. This model is a direct replacement for 8910DPA73V14 and DP3075A5016, offering a reliable drop-in solution for service technicians. Its robust construction includes an arc cover as standard and box lug terminations (screw terminals with quick-connect options) for secure chassis mount installation. When diagnosing high-amperage cooling systems, ensure the contactor coil resistance is within spec to avoid premature coil burnout and system downtime.

Key Benefits

• High-capacity 75 FLA rating ensures reliable performance in heavy-duty 3-phase commercial motors.
• Silver cadmium oxide contacts provide enhanced durability and long-term cycling reliability.
• Features direct compatibility with major OEM brands, simplifying contactor replacement in the field.
• Integrated arc cover protects internal components and improves safety during high-voltage switching.
• Versatile lug terminals allow for quick, secure electrical connections for both power and control circuits.

Common Questions

What are the signs that my 3-pole contactor needs replacement?
Watch for visible pitting or welding on the contacts, an audible "chatter" or humming from the 24V coil, or a failure of the compressor to engage despite receiving a call for cooling. If the contactor is stuck closed, the unit may continue to run after the thermostat is satisfied.

Can I use a 75-amp contactor to replace a 60-amp model?
Yes, in a definite purpose contactor application, you can typically "size up" the amperage rating (FLA) as long as the coil voltage (24Vac), number of poles, and physical mounting footprint match the original specs.

What causes a contactor coil to burn out prematurally?
Premature coil failure is often caused by low control voltage (below 18Vac), which prevents the armature from seating fully, causing the coil to draw excessive current and overheat. Environmental factors like moisture or debris between the poles can also contribute to failure.

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.