This CR Magnetics CR9380-NPN split core current switch has an NPN transistor, normally open (NO) contacts, a maximum off-state voltage of 30VDC, and is suitable for use in applications that require an "on" or "off" indication of current flow. This current switch has a 0.4" diameter window for routing the current-carrying wire. When current levels rise above the low fixed trip point, the switch will turn the output to full on. This switch is recommended only for applications where the continuous operating current is above the rated full on level of .350 AAC RMS. This current switch is Restriction of Hazardous Substances (RoHS) compliant and is suitable for use in monitoring electrical loads in power-using equipment such as heating elements and motors.

Specifications

*H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back

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.