Best Starter Relays for Refrigerators: 4.7 Ohm PTC Options
For a refrigerator owner, choosing the right starter relay is essential to ensure a reliable compressor start and long-term performance. This guide highlights 5 top 4.7 Ohm PTC starter relays, each paired with an overload protector. It helps buyers decide which kit best fits their model and power needs. The focus is on common mini-fridge and compact refrigerator setups, especially those using 110V compressors. The sections below compare what makes each product distinct and who should choose them.
| Product | Best For | Key Benefit |
|---|---|---|
| 1Pcs QP-02-4.7 3Pin Starter Kit | Tip-in repairs for 3-pin QP-02 relays | 3-pin compatibility with overload protector included |
| QP2-4.7 Starter Relay Kit (1 Pin) | Labelled 1-pin systems in compact fridges | Includes overload protector for 1/2HP units |
| Mudder QP2-4.7 Kit (2 Pieces) | Replacement parts for older units | Two-piece kit with universal PTC relay and protector |
| QP2-4.7 Starter Relay Kit | Mini fridges and coolers needing 4.7-ohm relay | Simple, compact replacement option |
| QP2-4R7 4.7 Ohm 3-Pin Kit | 3-pin relays in small appliances | Explicitly lists compatible pin configuration |
1Pcs QP-02-4.7 3Pin Starter Kit
- Brand: TUAIC
- Content: 1 x 4.7 ohm 3Pin starter relay + 1 x overload protector (1/2HP)
- Compatibility note: Only works with QP-02-4.7 3-pin relays
- Current limit: 12A maximum for the 4.7 ohm relay
Best for: Buyers with a QP-02 3-pin relay setup who need a direct replacement kit. It is ideal for 110V compressors and compact refrigerators. Choose this if your model uses the 3-terminal configuration and you require both relay and protective overload in one package. Caution: Do not exceed 12A to avoid overheating or damage to the relay.
QP2-4.7 1 Pin Starter Relay Kit
- Includes: 4.7 Ohm 1-pin relay + 1/2HP overload protector
- Replaces common part numbers like AP4439459, 1357963, AH3529540, EA3529540, PS3529540
- Compatibility: Fits refrigerators using a 1-pin QP2-4.7 relay
- Note: Suitable for many mini fridges and coolers
Best for: Consumers with a 1-pin QP2-4.7 configuration seeking a straightforward replacement kit. Better for smaller units where space is limited and a compact relay is preferred. Caution: verify the model compatibility to ensure a proper fit with your unit’s refrigerant circuit.
Mudder QP2-4.7 Kit (2 Pieces)
- Package: 1× 4.7 Ohm 1-pin PTC starter relay + 1× 6750C-0005P overload protector
- Compatibility: Only compatible with QP2-4.7 one-terminal relays
- Overload protector: Max 15A; helps prevent compressor overheating
- Model notes: Replacements for several listed part numbers; check refrigerator model before purchasing
Best for: Buyers updating older mini fridges that use a single-terminal QP2-4.7 relay. This kit provides a spare relay and protector, useful for DIY replacements. Caution: high-current units may require a higher-rated protector than 15A.
QP2-4.7 Starter Relay Kit
- Includes: 4.7 ohm 1-pin PTC starter relay + 6750C-0005P overload protector
- Compatibility: Works with most brands that use a 1-pin QP2 4.7-ohm resistor
- Replacements: Fits part numbers AP4439459, 1357963, AH3529540, EA3529540, PS3529540
- Note: Confirm fridge model before buying to ensure compatibility
Best for: Those replacing a 1-pin QP2-4.7 setup across various brands. Choose this if you want a widely compatible, compact kit with a built-in overload protector. Caution: compatibility varies by model; verify before purchase.
QP2-4R7 4.7 Ohm 3-Pin Kit
- Type: 3-pin PTC starter/start relay with overload protector
- Note: Explicit compatibility with QP2-4R7 three-terminal relays
- Replaces: QP2-4R7 / QP2-4.7 / QP2-4.7G12 and related part numbers
- Material: Plastic construction for durability
Best for: Buyers with a 3-pin QP2-4R7 relay need a direct match for their compressor start circuit. This kit simplifies replacement with a clearly stated compatibility. Caution: not suitable for non-QP2-4R7 relays.
Buying Guide
What to check before buying
Identify your refrigerator model and the pin configuration of the existing start relay. Check whether your unit uses 1-pin, 3-pin, or a specific QP2-4.7 variant. Confirm that the overload protector matches the compressor’s horsepower (often 1/2HP in these kits).
One-pin vs three-pin considerations
One-pin relays are common in smaller mini-fridges, offering compact form factors. Three-pin relays may be required for certain compressor circuits. Match the relay’s pin count to your OEM part to avoid incompatibility.
Current rating and safety
Most 4.7 ohm relays tolerate up to about 12–15A. Exceeding this limit risks overheating or damaging the relay. Always use the included overload protector when provided and ensure the protector’s rating aligns with the compressor’s current draw.
Compatibility notes and model checks
Product listings often list compatible models or part numbers. Use these as a guide, not a guarantee. If your refrigerator is older or uses a unique model, verify compatibility with the seller or a专业 technician before purchase.
Installation tips
Power off the appliance before any replacement. Remove the old relay and overload protector, noting wiring configuration. Install the new relay with the correct orientation and secure connections to prevent arcing. If unsure, seek professional assistance.
Summary of key differences
- 3-pin vs 1-pin: affects compatibility with your compressor wiring
- Overload protector included: simplifies safety in one kit
- Horsepower compatibility: some kits target 1/2HP units
- Model-specific notes: verify fridge model and part numbers
Frequently Asked Questions
- Q: Will any 4.7 ohm relay work in my fridge?
- A: Not necessarily. Check pin count, model compatibility, and whether an overload protector is included.
- Q: What is the purpose of the overload protector?
- A: It helps prevent compressor overheating by interrupting current if the load is too high.
- Q: How do I know which relay to buy for a mini fridge?
- A: Compare the relay’s pin configuration (1-pin or 3-pin) and the model’s compatibility notes with your fridge’s OEM part numbers.
- Q: Can I install these relays myself?
- A: If you are comfortable with appliance repair work and proper safety procedures, you can replace relays; otherwise, consult a technician.
- Q: Do these kits guarantee a longer compressor life?
- A: They replace worn parts and can restore proper start function, but overall compressor life depends on multiple factors including usage and seal integrity.