1 Classification by use: wave switch, band switch, recording and playback switch, power switch, preselection switch, limit switch, control switch, changeover switch, isolating switch, travel switch, wall switch, intelligent fire switch, etc.
2 According to the structure classification: micro switch, boat switch, toggle switch, toggle switch, button switch, key switch, as well as fashionable membrane switch and pointer switch.
3 Classification by contact type: Switches can be divided into three types according to contact type: A-type contact, B-type contact and C-type contact. Contact type refers to the relationship between the operating state of "the contact is closed after the switch is operated (pressed)" and the contact state. It is necessary to select the appropriate contact switch according to the application.
4 According to the number of switches: single control switch, double control switch, multi-control switch, dimming switch, speed control switch, splash box, doorbell switch, induction switch, touch switch, remote control switch, intelligent switch, access control switch and special switch for yuba.
Extended data:
Main parameters:
The rated voltage 1 refers to the allowable safe voltage when the switch works normally. If the voltage applied to the switch is greater than this value, it will lead to ignition and breakdown between the two contacts.
2 Rated current: refers to the maximum safe current allowed to pass when the switch is turned on. When this value is exceeded, the contacts of the switch will be burned due to excessive current.
Insulation resistance: refers to the resistance value of the conductor part and the insulation part of the switch, and the insulation resistance value should be above 100 mω.
Contact resistance: refers to the resistance between each pair of contacts when the switch is turned on. Generally, it is required to be below 0. 1-0.5ω, and the smaller the value, the better.
5 withstand voltage: refers to the highest voltage that the switch can withstand between the conductor and the ground.
6? Life: refers to the number of times the switch can be operated under normal working conditions. The general requirement is about 5000-35000 times.
Classification by structure
According to the structure, photoelectric switch can be divided into three types: amplifier separation type, amplifier built-in type and power supply built-in type.
1) separated amplifier is made by separating the amplifier from the sensor, using special integrated circuit and mixed installation process. Because the sensor has the characteristics of subminiature and diversity, the amplifier has more functions.
Therefore, this model adopts terminal station connection mode and can be used for AC and DC power supply. It has the function of on-off delay, can set the switch between light and sound, can control six output States, and has two output modes: contact and level.
2) The built-in amplifier integrates the amplifier with the sensor, and is made of special integrated circuit and surface mount technology, and works with DC power supply. Its response speed (0. 1ms and 1ms) can detect narrow and high-speed moving objects.
Changing the polarity of power supply can switch between bright and dark motion, and self-diagnosis and stable working area indicator light can be set. It has two output modes of voltage and current, which can prevent mutual interference and is very convenient for system installation.
3) Built-in power supply is integrated by amplifier, sensor and power supply device, using application specific integrated circuit and surface mount technology. Generally, AC power supply is used, which is suitable for replacing contact travel switch in production site and can be directly used in high voltage control circuit. You can also set a self-diagnosis stable work area indicator light, and the output is equipped with SSR solid-state relay or relay normally open and normally closed contacts to prevent mutual interference, which can be closely installed in the system.
Switching power supply generally has three working modes: constant frequency variable pulse width mode, constant frequency variable pulse width mode and variable frequency variable pulse width mode. The former working mode is mostly used for DC/ AC inverter power supply or DC/DC voltage conversion; The latter two working modes are mostly used for switching regulated power supply.
In addition, the output voltage of switching power supply has three working modes: direct output voltage mode, average output voltage mode and amplitude output voltage mode. Similarly, the former working mode is mostly used for DC/ AC inverter power supply or DC/DC voltage conversion; The latter two working modes are mostly used for switching regulated power supply.
References:
Baidu encyclopedia-switch