Contactor vs Relay: What's the Difference? - Physics Forums
2005年1月22日 · A contactor is designed for high-power use in industrial settings, while a relay is used for low-power applications in household appliances and electronic circuits. The main difference between the two is the amount of current they can handle, with contactors being able to handle larger loads.
Coil Voltage/Current: Understand Resistance in Relay Circuits
2022年9月30日 · 781-1C-24A Relay is listed as having ##177 \Omega## Coil Resistance. I'm assuming that figure will give the Real Power dissipated by the coil (entire relay circuitry) for some current ##I##, or some voltage ##V_{ac}## across its terminals? Just an ME here, my circuits knowledge is a little rusty, small, and minimally applied. Be Gentle!
Definite purpose and general purpose contactors - Physics Forums
2018年4月13日 · When selecting a contactor, consider the electrical load requirements, environmental conditions, and reliability needs of your application. For specific or harsh applications, a definite purpose contactor may be more suitable, while a general purpose contactor may be a better choice for more versatile applications.
Preventing Arcing Across Relay Contacts - Physics Forums
2008年11月27日 · Arcing can also cause contact welding, where the contacts become stuck together, preventing the relay from functioning properly. What are some common causes of arcing in relay contacts? The most common cause of arcing in relay contacts is high levels of inrush current, which occurs when a large amount of current is drawn when the contacts close.
Understanding Relay Ratings for Controlling Motors: A …
2016年8月22日 · A pilot duty rating is a contact rating intended for contacts that control the coil of another relay or contactor. These ratings are applicable when controlling loads like relay coils, contactor coils, solenoids, and other similar inductive loads.
Relay Chattering: Causes & Prevention - Physics Forums
2007年12月4日 · 1. When the relay 'makes' the new system load causes a step current drop in the relay drive coil due to an insufficiently sourced system power supply. This causes the relay to 'break', the open load allows the coil current to recover closing the relay again an so on.
Understanding Spark in Relay Contacts: Causes and Solutions
2016年8月2日 · Spark in relay contacts refers to the electrical discharge that occurs between the contacts when they open or close. This spark can cause damage to the contacts and affect the reliability of the relay. What causes spark in relay contacts? Spark in relay contacts is caused by the high voltage and current that is present when the contacts open or ...
Solenoid vs Relay: Uses & Differences - Physics Forums
2005年12月3日 · A relay, on the other hand, is an electrical switch that is controlled by an external signal. It uses an electromagnet to open or close a set of contacts, allowing or interrupting the flow of electricity. The main difference between a solenoid and a relay is that a solenoid produces linear motion, while a relay produces switching action.
Power electronic switches VS dc contactor - Physics Forums
2012年5月21日 · As we know the contactor in power circuit make spark when it open and so its contacts may damage and aging Is it possible to replaace the contactor by... Insights Blog -- Browse All Articles -- Physics Articles Physics Tutorials Physics Guides Physics FAQ Math Articles Math Tutorials Math Guides Math FAQ Education Articles Education Guides Bio ...
Relay and Capacitor circuit - blinking LED - Physics Forums
2020年1月16日 · The capacitor voltage, Vc across the relay, sets the relay current, Ir = Vc/Rr. The current Ir, needed to pull in the relay armature is significantly greater than the current needed to hold the relay armature in. C1 charges through R2 until the relay pulls in, then C1 discharges through the relay until the relay drops out, and the cycle repeats.