The auxiliary switch is a part of the main switch, which is configured in high-voltage medium voltage circuit breaker, disconnector other electrical equipment as the opening, closing, signal control interlocking protection functions of the secondary control circuit, can also be used as combination switch transfer switch. The word "auxiliary" in the name of auxiliary switch is because it is an independent switch. It is a carrier of auxiliary breaking, connecting interlocking functions in the control system.
Service conditions of auxiliary switch:
1. Ambient air temperature: - 40 ℃ ~ + 40 ℃;
2. The altitude of the installation site shall exceed 2000m;
3. The temperature humidity conditions are as follows: the average value of relative humidity measured within 24h does exceed 95%, the average value of water vapor pressure measured within 24 hours does exceed 2.2kpa, the average value of monthly relative humidity does exceed 90%, the average value of monthly water vapor pressure does exceed 1.8kpa, the condensation on the product surface due to temperature change is considered.
The acceleration is no more than 15m / s;
5. The air is obviously polluted by dust, smoke, corrosive combustible gases, steam salt spray.
There are many kinds of auxiliary switches.
According to the number of opening closing groups, the contact can be divided into six types: five opening (50), four opening one closing (41), three opening two closing (32), two opening three closing (23), one opening four closing (14) five closing (05);
According to the different types of terminals, it can be divided into screw crimping type (y) plug-in type (c);
According to the structure of push rod, it can be divided into two types: buffer (H) connector (L);
According to the specification of the shell, it can be divided into high body (g) low body (d). other forms of classification.