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This CR Magnetics AC output current switch has normally open (NO) contacts, a maximum off-state voltage of 240VAC RMS, and is suitable for use in applications that require an "on" or "off" indication of current flow. This self-powered, electrically isolated current switch has a fixed set point and the current-carrying wire is routed through an aperture. The normal state of the switch is "on" when the current level is zero. When the current level rises above the rated full-off level, the switch will turn the output to "off." This current switch is only recommended for applications where the continuous operating level is above the full-on rated level of 350 mA and is suitable for use in monitoring electrical loads in power-using equipment such as heating elements and motors.
Specifications
Contact formNormally open (NO)Off state voltage240VAC RMS maximumOn state current0.8AAC RMS maximum continuousRated full-on level350 mATurn-on time100 ms. maximum at rated full-on levelTurn-off time250 ms. maximum to 80% of VceMinimum holding current10 mAMaximum sensed currentContinuous at 100AAC; 1 second at 500AACOff state leakage50 ua at 240VAC maximumFrequency (at 60 Hz)50 to 400 HzOperating temperature-30 to +60 degrees CStorage temperature-55 to +85 degrees CWeight0.08 lb.Standards metRoHS (Restriction on Hazardous Substances)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.
rachelj
Reviewed in Canada on May 9, 2019
use it to turn on inline exhaust fan whenever the hood fan is turned on. Works well in my case.
Steve W.
Reviewed in the United States on April 18, 2016
I purchased 2 of these and they work fine. I noticed the following sentence in the description: "The normal state of the switch is "on" when the current level is zero." This is not correct. The switches are normally open (off). That is, they are open when there is no current detected. I have verified this by using them in my circuit which requires NO switches. See the CRMagnetics data sheet at: [...].While double checking the data sheet I remembered reading a caution that the switch should only be used when the current sensed is above the rating of 350mA. Since the sentence is nonsensical when describing a two state device like a switch, I suspect the company might just be engaging in a little clumsy CYA. I was a somewhat worried by this spec and tested the switches I received and found that there was at least 20% hysteresis in current sensing. My experience was that the switch was full off (100mA) above the hysteresis band. I did not test the on state beyond the 100mA @ 120VAC that my circuit draws.I tried to add a data sheet to this review but Amazon didn't offer the option to attach anything other than photos and videos.
J. Eaton
Reviewed in the United States on May 28, 2015
Worked 10 times then quit. Customer service was very helpful providing diagnostics and reviewing wiring diagrams, but quit responding once it was obvious the unit wasn't working......
hd94
Reviewed in the United States on March 1, 2015
I have bought a number of the these over the years and everyone has worked perfectly.
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