Detailed explanation of the characteristics of power relay RF sensor

　　When the input voltage, current, temperature, etc. reaches the specified value, the controlled output circuit is switched on or disconnected. Can be divided into electrical (such as current, voltage, frequency, power, etc.) relay RF sensor and non-electrical (such as temperature, pressure, speed, etc.) power relay RF sensor, characteristic relay RF sensor two categories. It has the advantages of fast action, stable operation, long service life and small size. Widely used in power protection, automation, motion, remote control, measurement and communication devices.

　　Relay RF sensor is an electronic control device, it has a control system (also known as input loop) and power relay RF sensor is controlled system (also known as output loop), usually used in automatic control circuit, it is actually a small current to control the larger current of an "automatic switch". Therefore, it plays the role of automatic regulation, safety protection and conversion circuit in the circuit.

　　1. Electromagnetic relay RF sensor is generally a power relay RF sensor composed of iron core, coil, armature, contact reed, etc. As long as a certain voltage is added to both ends of the coil, a certain current will flow through the coil, resulting in an electromagnetic effect, and the armature will overcome the pull of the return spring under the action of electromagnetic force attraction to attract the iron core, thereby driving the moving contact of the armature and the static contact (normally open contact). When the coil is powered off, the electromagnetic suction power relay RF sensor, the characteristics also disappear, the armature will return to the original position in the spring reaction force, so that the moving contact and the original static contact (normally closed contact) suction. This suction, release, so as to achieve the purpose of conduction in the circuit, cut off. For the "normally open, normally closed" contact of the relay RF sensor, it can be distinguished in this way: the static contact of the relay RF sensor coil when it is disconnected is called the "normally open contact"; The static contact in the connected state is called "normally closed contact".

　　2, the power relay RF sensor is a new type of thermal switch that uses thermal sensitive magnetic materials to detect and control temperature. It is composed of a temperature-sensing magnetic ring, a constant magnetic ring, a reed pipe, a heat-conducting mounting piece, a plastic substrate and some other accessories. Power relay RF sensors do not use coil excitation, but the magnetic force generated by the constant magnetic ring drives the switching action. Whether the constant magnetic ring can provide magnetic force to the power relay RF sensor reed tube is determined by the temperature control characteristics of the temperature-sensing magnetic ring.

　　3, the power relay RF sensor is a four-terminal device with two terminals as input terminals and the other two terminals as output terminals, and the isolation device is used in the middle to achieve electrical isolation of input and output.

　　Power relay RF sensors can be divided into AC and DC types according to the load power supply type. According to the type of switch can be divided into normally open type and normally closed type. According to the isolation type, it can be divided into hybrid type, transformer isolation type and photoelectric isolation type, and photoelectric isolation type is the most.

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