Is There A Heating Issue With The Terminal Block? Reasons And Solutions

As a key component of electrical connections, terminal blocks often generate heat during long-term operation, which not only affects the normal operation of equipment but may also cause safety accidents. The following provides a detailed analysis from two aspects: reasons and solutions.

Causes of fever

poor contact

When connecting the terminal block to the wire, if it is not tightened or loose, it will cause an increase in contact resistance. According to Joule's law, the heat generated by current passing through a conductor is proportional to its resistance. As the contact resistance increases, the heat generated will significantly increase, leading to terminal heating.

oxidative corrosion

In a humid and corrosive gas environment, the surface of the terminal block is prone to oxidation and corrosion, forming an oxide layer or a corrosion layer. These defective layers will increase contact resistance, hinder the smooth passage of current, and lead to heat accumulation.

Overload operation

When the current passing through the terminal exceeds its rated current carrying capacity, the terminal will generate excessive heat due to the inability to withstand the excessive current, resulting in heating phenomenon. Long term overload operation may also damage the terminals and cause more serious faults.

Improper installation

If the terminal block is not installed according to the specifications, such as improper installation position, poor heat dissipation conditions, etc., it will affect the heat dissipation effect of the terminal, resulting in the inability to dissipate heat in a timely manner and causing heating.

solution

Ensure the connection is securely fastened

Regularly check the connection of the terminal blocks, use appropriate tools to press the terminals and wires tightly, ensure a secure connection, and reduce contact resistance.

Take good protective measures

For terminal blocks in harsh environments, anti oxidation and anti-corrosion coatings or sealing measures can be used to protect the terminal surface from corrosion.

Reasonable selection of terminals

According to the actual load situation, select appropriate terminal blocks with rated current capacity to avoid overload operation.

Optimize installation environment

Ensure that the terminal blocks are installed in a well ventilated and dry location to ensure their heat dissipation effect.