Contactors and Relays

HVAC Contactors & Relays

The HVAC Contactors & Relays category focuses on the switching components that start and stop compressors, fan motors and auxiliary loads in residential and light-commercial systems. A reliable contactor or relay makes and breaks circuits thousands of times over its life, handling inrush current, voltage fluctuations and outdoor environments. When these parts wear out, they cause nuisance trips, intermittent operation and equipment damage, which is why having the right replacements on your truck is critical for same-day repair.

Here you’ll find definite-purpose contactors, single-pole and two-pole contactors, compressor contactors, fan relays, sequencing relays and control relays used throughout air conditioners, heat pumps, furnaces, air handlers and rooftop units. Many designs include clearly visible contacts, noise-reducing coils, screw or quick-connect terminals, DIN-rail or base mounting and coil voltages suited to common HVAC control circuits. From simple fan relays to heavy-duty multi-pole contactors, this section is designed to support both quick change-outs and planned upgrades.

• HVAC contactors – 1-pole, 2-pole and multi-pole definite-purpose contactors for compressors and outdoor fans.
• Fan and blower relays – switching indoor blowers, electric heat strips and accessory loads.
• General-purpose control relays – for low-voltage interlocks, staging and add-on equipment.
• Sequencers – staged electric heat control in air handlers and package units.
• Socket bases & accessories – mounting hardware and terminal options for panel work.

When selecting HVAC contactors and relays, confirm coil voltage, number of poles, full-load amp (FLA) and locked-rotor amp (LRA) ratings, contact configuration (NO/NC) and mounting style. Outdoor contactors must be sized to handle compressor inrush and environmental exposure, while indoor control relays must be compatible with low-voltage circuits and panel layouts. Use the Compare tools on this page to review ratings, terminal type, enclosure style and application notes before ordering.

Pro tip: Before condemning a contactor, check for proper coil voltage, tight terminal connections, pitted or welded contacts and signs of overheating or insect debris. For relays and sequencers, verify control voltage, continuity across contacts and correct timing or staging sequence. Document equipment nameplate data, breaker size and measured amp draw so you can select a properly rated HVAC contactor or relay that reduces callbacks.