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PTC P4-4.7 refrigerator start relay
Resistance: 4.7 Ohm
Connection: 4 terminals 6.3 mm + 2 male-type contacts (for compressor)
Dimensions: 22x33x29 mm
Description and operation principle
The P4-4.7 start relay is a key component for starting refrigerator compressors. It connects the motor's start winding to the power supply, ensuring its startup, and then automatically disconnects it, switching the motor to the run winding. This device helps maintain stable operation of the refrigerator and protects the compressor from overloads and damage.
Operation principle:
- When the refrigerator is plugged in, the relay connects the compressor's start winding.
- After the motor successfully starts, the start winding is automatically disconnected.
- After the compressor shuts off, the relay returns to its initial state, preparing for the next startup.
Technical specifications
| Specification | Value |
|---|---|
| Voltage and frequency | 220-240 V, 50-60 Hz |
| Housing material | Heat-resistant plastic |
| Manufacturer | China |
How to choose the right start relay
When selecting a start relay, it is important to consider the following aspects:
- Relay resistance - ensure it matches 4.7 Ohm.
- Number and type of terminals for connection to avoid incompatibility.
- Relay dimensions - they should fit the installation space in the refrigerator.
It is also recommended to check compatibility with your refrigerator model, if possible.
Reasons for relay replacement and prevention methods
The start relay may fail for the following reasons:
- Overload or short circuit in the system.
- Mechanical damage to the housing or contacts, which can lead to malfunction.
- Natural wear of the component due to prolonged use.
To prevent premature wear of the relay, it is recommended to:
- Regularly check the condition of electrical connections in the refrigerator.
- Avoid overloading the refrigerator and monitor its operation.
Difficulty of replacing the start relay
Replacing the P4-4.7 start relay requires certain skills and tools. The process includes the following steps:
- Disconnect the refrigerator from the power supply.
- Remove the back panel to access the compressor and relay.
- Disconnect the old relay, noting the order of wire connections.
- Install the new relay, connecting the wires in the same order.
- Ensure the connections are secure and reassemble the refrigerator.
Difficulty rating: from low to medium, depending on the user's experience. If you lack experience with electrical components, it is recommended to consult professionals for replacement.
