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Contactors (Electromechanical)

CC18/4SD24 Application Field and Working Principle

Contactors (electromechanical) are a type of switch used for controlling high wattage electrical devices. A CC18/4SD24 contactor is a specific type of contactor manufactured by ABB. It is part of their System Pro product family, and it typically has a coil voltage ranging between 24-28V AC/DC and can handle an AC-3 current of up to 18A. CC18/4SD24 contactors can be used in a wide range of applications, from furnaces, air conditioning systems, and water heaters to lighting panels, pumps, and compressors.When a user supplies the appropriate voltage to the coil of the contactor, this magnetically actuates a pivoting arm and the resulting force causes a set of contacts within the contactor to close, and thus supplies power to the circuit controlling the device. This magnetically actuated arm is generally referred to as an “armature” since it is magnetically-actuated. When the armature is activated, the contacts open and the power is cut to the device. The contactors are rated by the manufacturer for a specific AC-3 current. This means that contactors with a strength of 18A are designed to carry 18A continuously without overworking, and hence are referred to as “CC18” contactors. The 4SD24 coil refers to the coil voltage, in this case 24V AC/DC. This designates the voltage range to which the contactor is rated to function in. It should be noted that, with this design, the contactor springs back to the open position (“off”) when the current is interrupted, making it the ideal choice for applications that require frequent on/off cycles. It is also important to note that the CC18/4SD24 contactor is not designed for hazardous areas and should not be used in such applications. It is always advisable to consult the manufacturer’s specifications in order to determine the correct rating for the required application. Generally speaking, contactors have relatively large and bulky dimensions and correspondingly large contact surfaces, which allows them to switch higher currents without overheating. They are rated according to their withstand voltage, breaking capacity and power dissipation. The CC18/4SD24 offers a wide range of features, including AC coil design, quick make and break times, high breaking power, high insulation rating, dustproof and waterproof construction, and a wide operating temperature range (-40°C to +70°C). As with any contactor, the CC18/4SD24 should be sized appropriately for the application in order to ensure maximum performance. In conclusion, the CC18/4SD24 contactor is a reliable and efficient switching solution for a wide range of electrical applications. With its wide operating temperature range and robust design, it is the ideal choice for many applications. When paired with the appropriate coil voltage, it offers the highest level of performance and reliability.

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