Best Overload Relays for 2026 That Keep Systems Safe

A good overload relay acts like a circuit guardrail, helping keep a compressor from entering damage when conditions turn harsh.

You need the right current range, trip class, and motor fit, whether you are looking at a Wehhbtye 4 piece set, a 4387913 kit, or a PTC option like the QP2 4R7.

The details matter more than they first appear, and a small mismatch can determine how long your system lasts.

More Details on Our Top Picks

1. Wehhbtye Refrigerator Starter Relay and Overload Protector (4-Piece)

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   Best for LG

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   If you need a reliable LG compressor fix, this Wehhbtye 4-piece relay set is designed for the job. It includes two 4.7-ohm QP2-4.7 start relays and two 6750C-0005P overload protectors for quick replacement in LG compressors, mini fridges, wine coolers, and freezers. The plug-in, one-terminal design makes installation straightforward, and the overload protector helps prevent overheating. Made with durable plastic and brass, it resists rust and supports long-term use. Check your model before you buy, and restore cooling quickly. Builder support is available 24 hours if you need help.

   • Relay Type:1-pin PTC
   • Resistance:4.7 ohms
   • Compatibility:LG compressors
   • Overload Rating:Compressor protection
   • Mounting:Plug-in
   • Material:Plastic/brass
   • Additional Feature:4-piece set
   • Additional Feature:1-pin PTC relay
   • Additional Feature:24-hour customer support

2. Refrigerator/Freezer Overload Relay Kit (4387913)

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   Best Universal Fit

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   If you are matching a 4387913 kit, this overload relay is a strong universal fit option. It can be used with select Whirlpool, Maytag, Frigidaire, GE, KitchenAid, LG, and Magic Chef models. It also crosses with part numbers 7020935, 4387766, 4387836, and 4241370, which gives you several reference points when comparing parts. The overload is rated for 1/4 hp, and the 4 prong relay supports up to 4.7 ohms. If your kit includes a capacitor, connect the hot lead to the overload, the neutral to prong 2, and the capacitor to prongs 1 and 3. Always verify the photo, part number, and physical fit before ordering.

   • Relay Type:Overload relay kit
   • Resistance:4.7 ohms
   • Compatibility:Whirlpool/GE/LG
   • Overload Rating:1/4 hp
   • Mounting:Prong-based
   • Material:Not specified
   • Additional Feature:1/4 hp rating
   • Additional Feature:Capacitor included
   • Additional Feature:Wiring diagram provided

3. Refrigerator Compressor Relay and Overload Kit (5 Sets)

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   Best for Bulk Replacements

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   If you are swapping out multiple fridge starts, this 5-set kit keeps repairs moving fast. You get five QP2-4R7 4.7-ohm PTC relays and five 6750C-0005P overload protectors, so you can service several units at once. It fits most mini fridges, beverage coolers, wine refrigerators, deep freezers, and similar compressors from brands like Whirlpool, Frigidaire, Danby, and Haier. The plastic relay and stainless steel overload are built for reliable operation, and the direct replacement design makes installation easy. With automatic action, 4.7 amp ratings, and solid user feedback, you can keep systems protected.

   • Relay Type:1-pin PTC
   • Resistance:4.7 ohms
   • Compatibility:Mini fridges
   • Overload Rating:1/6 hp
   • Mounting:Through hole
   • Material:Plastic/stainless steel
   • Additional Feature:5 sets included
   • Additional Feature:1/6 HP overloads
   • Additional Feature:Through-hole connector

4. PTC Starter Relay and Overload Kit for Refrigerator Compressor

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   Best for 3-Prong Units

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   Need a replacement for a 3-prong compressor relay? Use the QP-02-4.7 PTC starter relay and overload protector kit for 110V, 60Hz refrigerator compressors. It fits only 3-terminal QP2-4R7 style relays with a 4.7 ohm black plastic design. It replaces part numbers such as QP2-4.7, WS-EP14F, AP4565041, and 1206682. You may need it when your compressor will not start, overheats, or clicks every few minutes. Before installing, unplug the refrigerator, wear gloves, and confirm the compressor model. It is best for 1/12 HP to 1/2 HP systems, and it is not universal.

   • Relay Type:3-pin PTC
   • Resistance:4.7 ohms
   • Compatibility:LG 3-terminal
   • Overload Rating:1/12–1/2 hp
   • Mounting:Through hole
   • Material:Plastic
   • Additional Feature:3-pin relay
   • Additional Feature:110V, 60Hz
   • Additional Feature:Professional installation recommended

5. QP2-4R7 PTC Starter Relay and Overload Kit

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   Best 3-Pin Option

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   If you need a reliable 3-pin replacement, the QP2-4R7 kit is a good fit. It includes a 4.7-ohm PTC starter relay and overload protector for mini fridges, beverage coolers, wine and beer refrigerators, deep freezers, and compressors. It is designed for 1/12 HP to 1/2 HP systems at 110V 60Hz and uses silver contacts with a through-hole, normally open design. CORINTH/CoKoou supplies the black plastic kit for straightforward installation. Be sure to match the QP2-4R7 three-terminal style, since it will not solve every cooling problem.

   • Relay Type:3-pin PTC
   • Resistance:4.7 ohms
   • Compatibility:LG 3-terminal
   • Overload Rating:1/12–1/2 hp
   • Mounting:Through hole
   • Material:Plastic/silver
   • Additional Feature:UL certified
   • Additional Feature:Silver contact material
   • Additional Feature:1.6-ounce unit

Factors to Consider When Choosing Overload Relays

When choosing an overload relay, ensure it fits your setup, matches the electrical rating, and has the correct pin count and wiring. Also check the material and durability to confirm it can handle your operating conditions. Finally, install it safely and verify that it works with your system before putting it into service.

Compatibility And Fit

Compatibility and fit matter just as much as electrical performance, because an overload relay has to drop into the compressor circuit cleanly and work exactly as the system expects. Verify the pin count, terminal layout, and connector style so the relay plugs into the compressor socket or harness without adapters. Check the mounting style, pin spacing, housing size, and overall package dimensions to make sure it fits the available space and mounting points. Confirm that the relay’s resistance and coil characteristics match the start circuit, especially if the compressor uses a PTC starter. Also, choose a relay built for the appliance’s voltage, frequency, temperature, and humidity conditions. When the physical fit is right, you reduce installation headaches and support reliable startup.

Electrical Rating Match

Once the relay fits the compressor circuit physically, make sure its electrical rating matches the motor it protects. Choose an overload relay whose current range matches or slightly exceeds the motor’s full-load current. For example, a 4.7 A relay suits a motor near 4.7 A. Check that its horsepower or thermal trip range fits the driven load, such as 1/12 to 1/2 HP for small refrigeration compressors. Verify that the voltage and frequency ratings align with your supply, such as 110 V and 60 Hz, so the relay does not trip incorrectly or fail. Also confirm that the trip class and time-delay profile can handle startup inrush while still stopping sustained overload. Finally, match the contact and terminal configuration so current flows through the correct thermal element.

Pin Count And Wiring

After you confirm the relay’s electrical rating, check the pin count and wiring layout so it matches the compressor circuit. A 1 pin PTC relay usually plugs into the start terminal, while a 3 pin relay gives you separate run, start, and common connections. You need to match the relay’s pin configuration to the compressor cabling exactly, because the wrong count or layout can stop the unit from wiring correctly and could damage the compressor or control circuit. Follow the system diagram and verify which pins serve the start capacitor, run winding, and common or neutral. Also, see whether the relay employs an integrated overload connection or needs an external overload with its own terminals. Whenever you replace a relay, compare terminal numbering and physical orientation, not just pin count.

Material And Durability

When selecting overload relays, focus on materials and build quality that can withstand the environment where they will operate. Choose corrosion resistant metals such as stainless steel or brass for contacts and housings if the system is exposed to humidity, washdown conditions, or refrigeration. Look for thermoset or rugged plastic housings with high thermal stability so they do not warp or lose insulation during repeated heat cycles. Check that contacts and terminals use silver or brass with protective plating to limit corrosion, reduce resistance, and minimize heat buildup. Also review cycle ratings and mean time between failures to assess service life under your workload. Finally, confirm that seals, coatings, and manufacturing tolerances match your vibration, moisture, and temperature conditions so the relay remains dependable over time.

Installation And Safety

Before you install or replace an overload relay, disconnect power and unplug the equipment to avoid electric shock or an unexpected compressor start. Also apply lockout/tagout, and wear insulated gloves and eye protection before touching any refrigeration or electrical parts. Next, check that the relay’s voltage and current ratings match your appliance circuit, including 110V/60Hz systems and the correct amp or horsepower range, so you do not risk overheating or nuisance trips. Follow the wiring diagram exactly: route hot to the overload, neutral to the proper prong, and connect any capacitor leads as shown. Tighten every terminal, remove corrosion, then restore power slowly and watch the compressor for several minutes for smooth starting, quiet operation, normal temperature, and no repeated tripping.

Frequently Asked Questions

How Often Should Overload Relays Be Tested?

You should test overload relays at least annually and after any maintenance, fault, or setting change. If your system runs hard or serves critical loads, check them more often, perhaps quarterly.

Can Overload Relays Work With Variable-Speed Motors?

Absolutely, overload relays can work with variable-speed motors, but you need the right type and settings. Use relays rated for the drive, because standard ones can misread current and trip unnecessarily.

What Signs Indicate Relay Calibration Drift?

You’ll notice relay calibration drift when trips happen too soon or too late, motor current rises without warning, nuisance alarms increase, and setpoints no longer match measured values during routine testing.

Are Overload Relays Reusable After Tripping?

Yes, overload relays can usually be reused after they trip once you have fixed the fault and reset them. Inspect the relay for damage, verify the settings, and test its operation before putting it back into service.

Do Overload Relays Affect Energy Efficiency?

Yes, overload relays can improve efficiency. They help prevent motor overheating, so less energy is wasted when a motor is under stress and drawing up to 10% more current. They also reduce downtime, which can cost more than electricity itself.

Wrap Up

Choosing the best overload relay for 2026 helps keep your compressor safer and your repairs less costly. Many compressor failures can be linked to overheating or mismatched protection. When you select the correct current range, trip class, and durable materials, you protect 1/12 to 1/2 HP motors from damage. Compare the kits above, verify voltage and wiring, and install carefully. If you do that, you can expect more reliable performance and longer system life.