Mini Refrigerator Wiring Diagram Explained (According to Given Circuit) | by HELPER7

 

Mini refrigerator wiring diagram with thermostat, overload protector, switch, PTC relay, and compressor terminals explained for beginners and technicians.

Mini Fridge wiring Diagram

Kelon Room size Mini Fridge wiring Diagram

Mini Refrigerator Wiring Diagram – Full Explanation (According to Your Diagram)

The uploaded diagram shows a basic mini-refrigerator electrical system that uses a thermostat, overload protector, switch, PTC starting relay, and a single-phase compressor with terminals C (Common), S (Start), M (Run). This simple wiring makes troubleshooting easy for any technician.

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1. Power Plug Connection

The circuit begins at the Power Plug.

• Line wire (L) goes to the thermostat.

• Neutral wire (N) goes directly to the compressor run terminal (M) and also to the PTC relay.

This direct neutral connection ensures the compressor always has a neutral path.

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2. Thermostat Wiring

The thermostat controls the cooling operation.
When the fridge temperature rises, the thermostat closes its contacts, sending power to the Overload Protector.

Function

• Turns the compressor ON/OFF

• Prevents unnecessary cooling when the desired temperature is reached

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3. Overload Protector (OLP)

After the thermostat, the current goes to the Overload Protector, which connects directly to the Common (C) terminal of the compressor.

Purpose

• Protects the compressor from high current

• Opens the circuit if the compressor overheats

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4. Compressor Terminals (C – S – M)

The compressor has three terminals:

• C (Common) – Comes from the Overload Protector

• M (Run) – Connected to Neutral directly

• S (Start) – Connected to the PTC Relay, which helps the compressor start smoothly

This is the standard mini-refrigerator wiring configuration.

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5. PTC Starting Relay

The PTC relay is connected between Neutral and the Start (S) terminal of the compressor.

How It Works

• At startup, the PTC passes current to the start winding (S)

• After a few seconds, resistance increases and cuts off the start winding

• Compressor then runs only on the Run (M) winding

This makes the compressor efficient and safe.

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6. Switch (Optional Accessory)

The diagram also shows an inline Switch connected to the supply.
It may be used for:

• Turning the fridge ON/OFF

• Controlling a lamp or indicator inside some mini-fridges

This switch simply interrupts or allows the power supply.

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How the Complete Circuit Works

1. Power enters from the plug

2. Line goes to the Thermostat

3. Thermostat sends power to the Overload Protector

4. Overload connects to Compressor Common (C)

5. Neutral goes straight to Run (M) and PTC Relay

6. PTC sends temporary power to Start (S)

7. Compressor starts → PTC cuts off → compressor runs normally

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