Smartele SE3707M Contactor 40 Amp 3 Pole 24V Coil

Product Description

The SMARTELE SE3707M is a 40-amp, 3-pole contactor with a 24-volt coil, designed for switching high-voltage load circuits in HVAC and light commercial electrical systems. The contactor uses low-voltage coil control to open and close its three main power poles, allowing a thermostat or control board to switch compressor and motor loads without direct high-voltage switching at the control circuit. At 40 amps and 3 poles, it is suited for larger single-phase or three-phase loads where a standard 2-pole contactor does not provide adequate pole coverage. Licensed HVAC technicians and electricians are the typical installers.

This contactor is used in residential and light commercial HVAC equipment including air conditioning condensing units, heat pumps, rooftop units, and packaged systems that require a 3-pole switching arrangement. It is also applicable in fan coil units, compressor circuits, and motor control panels where a 24-volt control signal is used to energize the coil. The 40-amp rating accommodates the locked-rotor and full-load amperage demands of mid-to-large capacity compressors and fan motors commonly found in these applications.

Key Features

• 40-amp continuous current rating supports mid-to-large compressor and motor loads
• 3-pole configuration provides switching for all three load conductors simultaneously
• 24-volt coil voltage is compatible with standard low-voltage HVAC control circuits
• Direct OEM-style replacement form factor for 3-pole, 40-amp contactor positions

Compatibility

Designed as an OEM-style replacement contactor for HVAC condensing units, heat pumps, and packaged equipment requiring a 3-pole, 40-amp, 24-volt coil contactor.

Installation Notes

Installation should be performed by a licensed HVAC technician or electrician. Disconnect and lock out all power to the unit before removing or installing the contactor, following NFPA 70E arc flash and OSHA lockout/tagout procedures. Verify that the replacement coil voltage and pole ampacity match the equipment nameplate requirements before energizing. Inspect contactor contacts for pitting or carbon buildup during replacement and replace any burnt or welded contacts rather than attempting to resurface them.