WHAT TO KEEP IN MIND WHEN DESIGNING-IN DC CONTACTORS

Aokai Intermittent DC Contactor Normally Open Type ADD Series 80A, 150A, 250A, 300A 12V, 24V

• Rated Insulation Voltage & Operating Current: When choosing a contactor it is first important to define the application requirements, considering the rated insulation voltage and rated operating current. Problems may arise when specifying the current as it is dependent on the contact resistance, material, input voltage, and contact force. When properly specified, depending on the operating conditions, the actual current value can deviate without damage being expected. 
• Inductance of the Circuit: In addition, the inductance of the circuit is important as it can influence the breaking capacity. There should also be considerations for the risk of a short circuit. If the DC contactor is not appropriately matched to the main fuse then damage to the contactor may occur. 
• Service Life Requirements: Finally, the service life requirements depend on the application. Certain contactors provide specialized capabilities for the automotive/battery industries, offering no-load switching cycles. On the other hand, for industrial applications, they are designed to handle switching cycles under defined loads.