The VME420 is Multi-functional monitoring relays made by Bender.
Brief overview of the content in a VME420 PDF file
Bender Incorporated 700 Fox Chase Coatesville PA 19320 Tel 800 356 4266 Fax 610 383 7100 VME420 Multi functional monitoring relays for overvoltage undervoltage and frequency monitoring in AC DC systems with external supply voltage Product description The voltage relays of the VME420 series are designed to monitor the frequency undervoltage overvoltage and the voltage between two threshold values window discriminator function in AC and DC systems The voltages are measured as r m s values The currently measured value is continuously shown on the LC display The measured value leading to the activation of the alarm relays will be stored Due to adjustable response times installationspecific characteristics such as device specific start up procedures short time voltage fluctuations etc can be considered Device version VME420 requires an external supply voltage Typical applications Single VME420 3 1 phase voltage and frequency monitoring of machines and electrical installations Earth fault monitoring in medium voltage systems via voltage transformers Monitoring of battery systems Switching on and switching off at a certain voltage level Function Once the supply voltage is applied the start up delay t
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Q: What is a relay, and how does it work? A: A relay is an electromagnetic switch that uses an energized coil to open or close a circuit. When the coil is energized, it creates a magnetic field that pulls a contact armature towards it, closing a set of electrical contacts. When the coil is de-energized, the magnetic field collapses, and the contact armature returns to its original position, opening the contacts. Q: What are the types of relays? A: There are many types of relays, including electromagnetic relays, solid-state relays, thermal relays, reed relays, and time-delay relays, among others. Each type of relay has its unique design and application. Q: What is the purpose of a relay? A: The primary purpose of a relay is to switch electrical circuits on and off. It is commonly used in control circuits to control high-power loads or where a signal from a low-power circuit is used to control a higher power load. Q: What are the advantages of using a relay? A: Relays offer several advantages, including isolation of the controlling circuit from the controlled circuit, the ability to switch high power loads with low power circuits, and the ability to switch multiple circuits simultaneously. Manufacturers : Bender  |
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