Helpful ground fault relay for High-Risk Applications
Reliable ground fault relay Designs for Industrial and Industrial Applications
CHINA – ?¡ãAny Electronics?¡À proudly presents their entire variety of ground fault relay . They provide a total set of ground fault relay items as well as other interrelated merchandise. These units are observed in unique applications for instance commercial applications, industrial control circuits together with OEM Panels. These devices come with superb precision and repeatability. The typical ground fault relay which might be made nowadays call for extremely little panel space.
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CR Magnetics CR7310-EL-24D-330-X-CD-ELR-I Ground Fault Sensor Relay with Internal Transformer, 24 VDC, Energized on Low Trip, 3.0 to 30 AAC Trip Range
This CR Magnetics ground fault sensing relay has an internal transformer, requires a supply voltage of 24VDC, 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 drop below 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. 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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Don't complicate things! 🙂 asked Why is the neutral of a power system grounded?
If a live AC wire is touched, current flows through to the ground. If the system is not grounded, the circuit will not be completed. Will this mean that we won't get a shock if the system is ungrounded? Won't it be safer? "... If the neutral was not pinned to ground, one of the hots could float up to 240 volts above ground, increasing the shock hazard. " How can there be a shock if current can't flow through the body?
And got the following answer:
Power systems are grounded to control over-voltages. If the system is not grounded, then nearby lightning strikes and other events can induce high voltage onto the conductors. The voltage can exceed the rating of the conductor insulation and equipment to which the wires are attached. Possible outcomes are insulation failure and electrocution. Another issue with ungrounded systems is that when a fault eventually starts (and they start small), it often is an intermittent fault from line to ground. The wiring system naturally has some distributed capacitance to ground. The intermittent fault tends to occur on the voltage peaks in such a fashion that it acts somewhat like rectifier. The result is that the voltage can build up to about x6 the nominal line voltage. Again this will eventually cause insulation and/or equipment failure if not remedied fairly quickly. A reason for grounding the neutral (solidly) is to allow enough fault current to flow during a line-to-ground fault so that the upstream circuit breaker will trip or the fuse will blow to automatically remove power from the faulted system. In industrial systems where it is critical that equipment continue running during a first fault to ground, the neutral is grounded through a high resistance that limits the fault current to a low value that doesn't cause damage but is sufficient to drain off any overcharging from nearby lighting strikes or intermittent faults. A ground-fault detector relay is used to warn the power-system operator when a ground fault has occured so that he/she may schedule maintenance at a convenient time to correct the problem.
The ground fault relay function incredibly properly with distinctive applications which are distinct to energy distribution and protection. The relays come with wide adjustment ranges with a scale which is simple to study either in 3 or four digits in line with the model. These ground fault relay aid in rising the flexibility in the applications, decrease the all round power and maintenance charges. There are actually relays which are made use of for common purposes which come in reliable designs with swift replacement options. And there are actually models which can be made use of for industrial applications and heavier duty applications that operate on substantial loads. These products are made to meet the lifetime industrial control wants on the applications.
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