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Power Relays

Over 2 Amps

A power relay is an electromechanical device, the switching of which is electrically controlled. It consists of a coil, a contact system, an iron core and a spring. When power is applied to the coil, an electromagnetic field is created and the iron core is pulled into the coil, thus allowing current to flow. When power is removed from the coil, the force of the spring causes the core to move away and open the circuit.

Power relays are used in a variety of applications, generally those which require a discrete, mechanical switch rather than a digital one. Common uses for power relays include controlling the power supply to motors and other equipment, providing protection to circuit breakers, and triggering alarms or other notifications.

Power relays with ratings of over 2 amps are typically used in applications which require higher current. Higher current relays are often used for controlling and supplying power to motors and other high current equipment, such as HVAC systems. They are also used to provide protection for high current equipment, such as circuit breakers, from damage in the event of an overload or short circuit. Additionally, higher current relays can be used to trigger alarms or notifications in the event of an overload or short circuit.

Higher current relays typically consist of a coil, a contact system, and an iron core, much like their lower current counterparts, but the construction differs in that the core is typically thicker and made of magnetic steel. This allows the relay to open and close at higher speeds and carry larger currents. Additionally, the contact system is typically designed for higher current applications, commonly containing silver, gold, or other precious metals, since these metals have higher resistivity and can withstand higher temperatures due to their higher melting points.

When selecting a power relay for a particular application, factors such as VA rating, current rating, coil resistance, and contact rating should be taken into consideration. VA rating refers to the voltage-amp combination of a particular relay, and is usually provided in the form of VA or Watts. Current rating is the maximum current that a particular relay can handle, generally between 10 and 100 A. Coil resistance is the resistance of the relay\'s coil and is typically provided in ohms. And contact rating is the amount of current the contacts of a particular relay can carry and is commonly provided in amps.

Power relays can provide a great benefit in many applications, due to their fast switching times, reliable operation, and ability to carry higher current than other types of relays. They are an invaluable component in many circuits, and can be found in almost any device which requires switching of large currents.

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