Relays are an important component in the circuit, and the pins are interfaces through which relays connect to the outer circuit. Once damaged, they can directly affect the normal operation of equipment. If the relay pins are damaged, the whole circuit may not work. The causes, repair methods, and how to prevent similar issues of relay pin damage are described in detail below.
What are relay pins?
The relay pins are important parts in the connection of the circuit, which is usually divided into two parts: one is the control circuit, and the other is the load circuit. Some common relay pins include a coil terminal for inputting a control signal.
- Public end (COM): This is the default connection point in a circuit.
- Constant Starting (NO): On energization, the relay connects the circuit.
- Normally closed end (NC): The on state is maintained when the relay is not triggered.
Common causes of relay pin damage
- Pin corrosion: The pin can rust or corrode because of moisture or chemicals in the atmosphere.
- Welding point detachment: In cases of prolonged use or heavy mechanical pressure, the welding can become weak.
- Mechanical damage: The pins can get bent or broken during installation or even in transport.
- Current overload: If the current load is beyond the specification rating, overheating and sometimes burning out may occur with the pins.
How to check if the relay pins are damaged
Use a multimeter to check
Measure the on/off status between the pins and check for any open or short circuits.
Check if the resistance value is within the normal range according to the relay specification table.
Check the physical state of the pins
Observe whether there are signs of corrosion, oxidation, rust, or breakage on the pins.
Confirm whether the pin soldering points are secure, without looseness or poor contact.
Solution for damaged pins
1. Methods for repairing pins
- Clean corroded pins: Gently sand the corroded parts with fine sandpaper to restore their conductivity.
- Welding loose pins: Use an electric soldering iron to re weld the detached pins to ensure a secure connection.
- Temporary repair of broken pins: If the pins are broken but not completely detached, conductive adhesive or metal wires can be used for temporary repair.
2. Methods for replacing relays
- When the pins are damaged and cannot be repaired, replacing the relay is a more reliable option
- Confirm the specifications of the relay (voltage, current, pin configuration).
- Remove the old relay after a safe power outage.
- Install the new relay correctly according to the circuit diagram and secure the wiring.
Comparison of the cost of repairing and replacing relay pins
| Method | Advantages | Disadvantages |
|---|
| Repairing Pins | Low cost, simple operation | May not fully restore function, reduced durability |
| Replacing Relay | More reliable, restores original performance | Higher cost, requires more complex procedures |
If the relays of the equipment are no longer repairable and need to be replaced, you can choose QIANJI, a factory direct supplier that provides high-end quality and low prices. It supports customized demand services. You can send us circuit diagrams or visit our product categories to see if there is the type you need. If not, you can contact us to provide you with more information.
FAQ
What do I do if the relay pins rust or corrode?
Clean the corroded area using fine sandpaper and apply antioxidant to protect the surface.
Can I fix the broken pin myself?
Though conductive adhesive or welding is possible for temporary repairs, the replacement of the relay is highly recommended.
Is it better to repair or replace the relay?
If the relay is lightly damaged, you can try to repair it; If it is severely damaged, it is recommended to replace it.
How to protect relays from moisture?
Use waterproof casing or moisture-proof coating to ensure a dry installation environment.
What tools are needed to repair the relay?
Multimeter, soldering iron, fine sandpaper, conductive adhesive, etc.
