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The motor that will be turned on/off constantly will require higher current loads and thus require a larger contactor. For example, if you have two applications, both using the exact same motor, but in one case the motor will simply be turned on for long periods of time, while the other will be turned on/off constantly, you will likely use two different IEC contactors for each application. This is important because these will in part, determine which contactor you use. IEC uses utilization categories, or “codes,” to describe specifically the type of electrical load and duty cycle of the load(s).
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Generally, coil voltages are 250V or below. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes. You should next confirm the control voltage to be used to power the contactor.
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Choose your motor horsepower, input voltage, and single or 3 phase from the dropdowns, and the calculated full load amperage is displayed. Use it for guidance, but please always refer to the equipment nameplate for the specific information whenever possible as the FLA can vary greatly due to a variety of factors. If you do not have the equipment specifications or nameplate available, the NEC (National Electric Code) has created a contactor sizing chart to help determine the FLA for a given squirrel cage motor size at a given voltage according to IEC standards, and we’ve converted the NEC chart into a calculator. Generally speaking with motors and other industrial equipment, you want to look at the nameplate to confirm the input voltage and the Full Load Amperage (FLA). Since P is based on your device’s power requirements, it will remain constant, if you lower the voltage, the current must increase to balance the equation, and vice versa. I (or A) is the electric current in amperes, and V is the voltage. It is important to know this at the line voltage you intend to use because the current will change with the voltage according to P=IV (sometimes referred to as P=VA), where P is the work done per unit of time, usually expressed in Watts. This load amperage is the amount of current required to power your device at the line voltage. The first item to consider is the load, which is measured in amperes.
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There are 5 primary things to consider when determining how to size a contactor for your application: Full Load Amperage at Line Voltage Today we’re going to talk about selecting a contactor for your application requirements. NEMA and discussed the basics of a motor starter. In previous blog posts, we talked about the differences between IEC vs. Home » About Us » News » How to Select and Size an IEC Contactor How to Select and Size an IEC Contactor