These secondary switching devices, referred to as auxiliary contacts, find their application in circuit breakers, relays, contactors, and other primary electrical equipment. Mechanically linked to the main contacts, they close and open at the same time as the main contacts, enabling additional functions without directly switching the current load of the main circuit. These are mainly of two types-Normally Open (NO), which means they will close during activation of the main device, and Normally Closed (NC), which opens when the main device is activated. Their main function is to indicate the status, interlock to prevent two devices from operating simultaneously, and integrate control circuits to perform actions such as activating alarms or indicators. Some traditional areas of application include motor starters, safety interlocks, and status monitoring, which enhance the functionality, safety, and control of electrical systems. Benefits Increased Safety: They provide an extra safety feature since they ensure that the electrical system is functioning properly and that power is indirectly turned off when something goes wrong, greatly lowering the chances of overheating and subsequent fire accidents. Preventing Electrical Failures: Overcurrent devices allow the load to be switched off through the control power circuit, hence reducing the risk of damage to equipment from electrical failures. Enhanced System Reliability: They protect the auxiliary contactors from overloads, thus limiting damage and enhancing the reliability of the entire electrical system. Operational Flexibility: They improve the control and monitoring capacities of devices, minimize operation complexity, and increase efficiency. Space Economy: Auxiliary contact blocks can be retrofitted to existing equipment to tailor its specifications without demanding too much additional space.
