1. Rated voltage and rated current
Rated voltage: The rated voltage of the UL Plug Inser should match the rated voltage of the connected electrical equipment to ensure that no safety problems caused by overload or voltage fluctuations occur under normal working conditions.
Rated current: The rated current of the Plug Insert should be greater than or equal to the maximum rated current of the connected electrical equipment to ensure that the plug core can work stably when the electrical equipment is running at full load and will not be damaged due to excessive current.
2. Resistance and insulation resistance
Resistance value: The resistance value of the Plug Insert should meet the product specifications provided by the manufacturer to ensure that no excessive heat or energy loss is generated due to excessive resistance when transmitting electrical energy.
Insulation resistance: Insulation resistance is an important indicator for measuring the electrical insulation performance of the plug core. The UL standard requires that the insulation resistance of the Plug Insert in a cold state should be no less than a certain value (the specific value may vary depending on the product category and grade) to ensure that no safety hazards such as leakage or short circuit occur under normal working conditions.
3. Withstand voltage and insulation strength
Withstand voltage test: By applying a certain high voltage (such as AC or DC voltage) to the insulation part of the plug insert, test whether it can withstand without breakdown or excessive leakage current. This is to verify the insulation performance of the plug insert under extreme conditions such as overvoltage or lightning strike.
Insulation strength: Similar to the withstand voltage test, the insulation strength test is also an important means to evaluate the electrical insulation performance of the plug insert. It requires that the plug insert can maintain sufficient insulation strength under the specified test conditions to prevent faults such as current leakage or short circuit.
4. Contact resistance
Contact resistance test: Contact resistance is an important indicator to measure the conductive performance of the contact surface of the plug insert. The UL standard requires the contact resistance test of the contact surface of the plug insert to ensure that its contact resistance value is within the specified range (such as not greater than a certain value) to reduce the loss or attenuation of signals and energy during transmission.
5. Other electrical performance requirements
Temperature rise test: After working for a period of time at the rated current, measure the temperature rise of the plug insert and its surrounding environment to ensure that its temperature rise does not exceed the specified limit to avoid fire or damage to electrical equipment due to overheating.
Electromagnetic compatibility (EMC): For certain types of electrical products, UL standards may also require that the plug insert meet electromagnetic compatibility requirements to prevent the electromagnetic interference it generates from affecting the normal operation of other devices or being affected by electromagnetic interference from other devices.