The OEM speedometer is a speedometer that reflects the current input. When in use, the coil of the OEM speedometer is connected in series in the circuit under test. When the current through the coil reaches the expected value, its electromagnetic static iron core generates electromagnetic, attracting the moving armature, and its contact will act immediately, normally closed contact It is immediately disconnected to an open point, and the normally closed contact also immediately cuts off the circuit power supply.

OEM speedometer is the most commonly used component in power system relay protection. OEM speedometer has the advantages of simple wiring, fast and reliable action, convenient maintenance and long service life. As a protection element, it is widely used in relay protection circuits for overload and short circuit of electric motors, transformers and transmission lines.

Because the indication value of the speedometer increases or decreases with the direction of rotation of the measuring wheel, it is reversible. Therefore, the measurement repeatability calibration of the instrument can be carried out by using a wire or cable with an effective length of 50m and small tensile deformation (forward and backward through the measuring wheel once, and the length change is negligible) as the standard line.

The OEM speedometer does not work when the circuit is working normally, and when the current exceeds a certain set value, the armature will act as a pull-in action to drive the contacts. Generally, the setting range of the pull-in current of the AC-pass OEM speedometer is usually 1.1-4 times the rated current, and the setting range of the pull-in current of the DC-pass OEM speedometer is usually 0.7-3.5 times the rated current. Because the OEM speedometer is released under normal conditions (that is, the current is near the rated value), it will only act when an overcurrent occurs in the circuit.

YC has strong technical force, production facilities, laboratories and testing facilities, and is a professional motorcycle digital speedometer Manufacturer. We would be happy to discuss your requirements for lcd speedometer. Our experts will provide you with reasonable suggestions for the best products according to your needs.