Helpful latch relay circuit for High-Risk Applications
Reliable latch relay circuit Styles for Commercial and Industrial Applications
CHINA – ?¡ãAny Electronics?¡À proudly presents their whole range of latch relay circuit . They provide a complete set of latch relay circuit products and also other interrelated items. These units are noticed in diverse applications including commercial applications, industrial control circuits as well as OEM Panels. These devices include great precision and repeatability. The typical latch relay circuit which are designed lately call for really small panel space.
latch relay circuits
latch relay circuit diagram
CR Magnetics CR7310-LH-120-.11-X-CD-ELR-I Ground Fault Sensor Relay with Internal Transformer, 120 VAC, Latch on High Trip, 0.1 to 1.0 AAC Trip Range
This CR Magnetics ground fault sensing relay has an internal transformer, requires a supply voltage of 120VAC, and is used for monitoring ground faults in power supply applications. This current sensing relay has a window for routing the current-carrying wire and a calibrated dial for setting the trip point. An adjustable delay-on timer provides stability. When current levels rise above the adjusted set point, the relay is tripped and starts the timer. Once the timer cycles, the relay is energized and turns the output to full on. The relay remains tripped (latched) until supply power is removed. It has an internal transformer for scaling the current up or down and a voltage reference circuit that provides a repeatable trip point. This ground fault sensing relay has an LED indicator that alerts the user when the relay is tripped and is suitable for monitoring motor ground faults, sensing early failure of heater elements, and protecting equipment.
|Contact form||1 Form C (SPDT)|
|Contact material||Silver-cadmium oxide|
|Power-on delay||100 ms. maximum|
|Input supply power||80 mA normal; 100 mA maximum|
|Rated output||20 amps maximum|
|Maximum sensed current||Continuous 200% full scale|
|Mechanical life||10 million operations at normal rated load|
|Electrical life||100,000 operations at normal rated load|
|Initial contact resistance||50 milliohms maximum at 500 mA, 12VDC|
|Frequency (at 60 Hz)||50 to 400 Hz|
|Operating temperature||-30 to +70 degrees C|
|Storage temperature||-55 to +85 degrees C|
|Terminals||3 1/4" male QC|
|Standards met||UL (Underwriter's Laboratories)|
RoHS (Restriction on Hazardous Substances)
CSA (Canadian Standards Association)
Relay switches (also called an electrical relay or an electrical relay switch) use a small amount of power to control a larger source of power connected to electrical devices such as car motors, computers, and lighting installations. A basic relay switch has a control circuit with an electromagnetic coil and a load circuit with contacts and a lever. When current flows into the relay switch, it moves through the coil and a magnetic field is created, which causes the lever in the load circuit to move between contacts, either turning the device on or off. In a normally open (NO) relay switch, when power is supplied to the relay, the load circuit is closed and the power source connected to the relay is turned on. In a normally closed (NC) relay switch, when power is supplied to the relay, the load circuit is open and the power source connected to the relay is turned off. In other types of relay switches, non-moving parts such as transistors or semiconductors can be used as the control circuit to operate the switching mechanism. Relay switches can be controlled with an external switch, such as a light switch, or they can be connected to an automatically switched power source, such as a car ignition. One relay can operate multiple switches, and multiple relays can be operated with a single switch, with each relay operating independently from the other relays in the system.
CR Magnetics manufactures electrical sensors, indicators, and displays. The company, founded in 2004, is headquartered in Saint Louis, MO.
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I am using a simple 12v dc motor circuit with the following items wired into it. I have tried to provide as much information as possible. So far the circuit works great but I want to be able to adjust the motor speed. The motor is on a H-bridge type relay to allow me to reverse the direction. 12vDC lead acid battery Motor 12v - power rating 6.21w relay 1 12v latching relay (max voltage 220v) 100mΩ contact resistance relay 2 max DC 240v maximum current 10A contact resistance 50mΩ I want to add a potentiometer/variable resistor to the circuit to ramp the voltage between 9v and 12v to adjust the motor speed. I have tried a few pots but keep burning them out due to my lack of voltage/current/resistance knowledge. Can someone suggest a simple way of doing this and show me the working so I can work it out myself in future. No 'see a proper electrician' comments please - not helpful! Thanks in advance. Any rating details I should look for on my pot would be great. Thanks!
And got the following answer:
If the motor is rated 6.21W at 12V, the rated current is 6.21/12 or about 0.5A. At 9V it could still draw 0.5A depending on what it is driving. If you want to reduce the voltage by 3V at 0.5A, the resistance should be 3/0.5 or 6 ohms. The potentiometer or variable resistor should be able to carry 0.5 amps. If you use a 10 ohm resistor, it would need to be rated for at least 10 ohms X 0.5A squared or 2.5W (5W would be better). If you use a 25 ohm resistor it will need to be rated for at least 6.25W (10W would be better). If you calculate the wattage of the variable resistor using the maximum current and add a safety factor, the resistor should be able to carry that current as a variable resistor regardless of what resistance it is set for. If you connect it as a potentiometer, you will need a higher power rating because one end of it will need to carry current to both the motor and the other end of the potentiometer.
The latch relay circuit work incredibly nicely with diverse applications which might be precise to power distribution and protection. The relays come with wide adjustment ranges having a scale that may be simple to read either in 3 or four digits in accordance with the model. These latch relay circuit help in growing the flexibility of the applications, decrease the general power and maintenance charges. You will find relays that are used for common purposes which come in trustworthy designs with swift replacement alternatives. And there are models which are utilised for industrial applications and heavier duty applications that function on huge loads. These goods are created to meet the lifetime industrial handle requires from the applications.
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