Emerson Climate Technologies 90-171 3-pole Contactor

Product Description

The Emerson Climate Technologies 90-171 is a 3-pole contactor rated at 40 amps and 120 volts, designed for switching loads in HVAC and refrigeration control circuits. Contactors of this type serve as the primary switching device that energizes compressors, condenser fan motors, and other high-draw components on command from a lower-voltage control circuit. Licensed HVAC technicians install and replace this type of contactor during both scheduled maintenance and emergency service calls. The 90-171 follows standard DIN-rail or panel-mount contactor form factors common across residential and light commercial equipment.

This contactor is suited for use in packaged rooftop units, split-system air conditioners, heat pumps, and commercial refrigeration equipment where a 3-pole switching configuration and 40-amp load rating are required. Three-pole contactors are specified when all three legs of a three-phase load must be simultaneously switched, or when the application calls for multi-pole single-phase switching with additional contact capacity. Technicians select this unit as a direct OEM-style replacement when the existing contactor shows signs of pitted contacts, coil failure, or heat damage.

Key Features

• 3-pole configuration for simultaneous multi-leg switching
• 40-amp load rating handles compressor and motor starting currents
• 120-volt coil voltage compatible with standard residential and commercial control circuits
• OEM-style form factor supports direct drop-in replacement on compatible equipment
• Designed for repetitive switching duty cycles typical of HVAC compressor and fan motor applications

Compatibility

Designed as an OEM-style replacement contactor for HVAC and refrigeration systems requiring a 3-pole, 40-amp, 120-volt contactor configuration.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified electrician in accordance with applicable NEC requirements. Disconnect and lock out all power to the unit before removing the existing contactor or making any wiring connections. Verify coil voltage and pole configuration match the equipment wiring diagram before energizing. Do not operate the contactor outside its rated amperage to avoid premature contact wear or coil burnout.