1, expand the control range.
For example, when the control signal of multi-contact relay reaches a certain value, multiple circuits can be switched, disconnected and connected at the same time according to different forms of contact groups.
Step 2 zoom in
Such as sensitive relays, intermediate relays, etc. With a small amount of control, you can control a high-power circuit.
3. Integrated signal
For example, when a plurality of control signals are input into a multi-winding relay in a specified form, a predetermined control effect is achieved through comparison and synthesis.
4, automatic, remote control, monitoring
For example, the relay on the automatic device can form a program control circuit together with other electrical appliances, so as to realize automatic operation.
Extended data
Working principle and characteristics of relay
When the input quantity (such as voltage, current, temperature, etc. ) reaches the specified value, the controlled output circuit is turned on or off.
Can be divided into electrical relays (such as current, voltage, frequency, power, etc. ) and non-electrical relays (such as temperature, pressure, speed, etc.). ).
It has the advantages of fast action, stable work, long life and small size. Widely used in power protection, automation, sports, remote control, measurement and communication equipment.
Relay is an electronic control device, which has a control system (also called input loop) and a controlled system (also called output loop).
Usually used in automatic control circuits, it is actually an "automatic switch" that uses small current to control large current. Therefore, it plays the role of automatic adjustment, safety protection and conversion circuit in the circuit.
Technical parameters of main products of relay
1, rated working voltage
Refers to the voltage required by the coil when the relay works normally. Depending on the model of the relay, it can be AC voltage or DC voltage.
2. DC resistance
Refers to the DC resistance of the coil in the relay, which can be measured by multimeter.
3. Pull-in current
Refers to the minimum current that relay can produce pull-in action. In normal use, the given current must be slightly larger than the pull-in current before the relay can work stably.
In general, the working voltage applied to the coil should not exceed 1.5 times of the rated working voltage, otherwise a large current will be generated and the coil will be burned.
4. Discharge current
Refers to the maximum current that the relay produces release action. When the current in the pull-in state of the relay decreases to a certain extent, the relay will return to the non-energized release state. At this time, the current is much less than the pull-in current. ?
5, contact switching voltage and current
Refers to the voltage and current allowed by the relay to the load. It determines that the relay can control the voltage and current, and cannot exceed this value when it is used, otherwise it will easily damage the contacts of the relay.
Refer to Baidu Encyclopedia-Relay