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There are various types of sealed connectors, divided by frequency, including high-frequency connectors and low-frequency connectors; There are circular connectors and rectangular connectors according to their appearance; According to usage, there are connectors for printed circuit boards, cabinets, audio equipment, power supplies, special purpose connectors, and so on. There are various types of connectors, usually classified according to their operating frequency, electrical requirements, and other characteristics.

Classified by working frequency:

1. Low frequency connectors. Usually refers to connectors that transmit signal frequencies below 100MHz, and the transmission current of such connectors

2. High frequency connectors. Usually refers to connectors used in circuits with operating frequencies above 100MHz. This type of connector needs to consider issues such as leakage and reflection of high-frequency electric fields in its structure. Due to the fact that coaxial structures are generally used to connect coaxial lines, they are also commonly referred to as coaxial connectors.

3. Mixed high and low frequency connectors. Usually refers to connectors that contain both low-frequency and high-frequency contact pairs.

Classified according to electrical requirements:

According to their electrical requirements, connectors can be divided into general connectors, high-power connectors, high-voltage connectors, pulse connectors, low-noise connectors, anti-interference filtering connectors, phase modulation connectors, coaxial connectors, etc.

Classified by environmental conditions:

Connectors can be divided into sealed connectors, radiation resistant connectors, high-temperature connectors, low-temperature connectors, etc. according to their working environmental conditions.

Classified by external structure and installation method:

Connectors can be divided into circular connectors, rectangular connectors, straight connectors, bent connectors, etc. based on their external structural characteristics. According to their installation methods, they can be divided into cable connectors, panel connectors, through wall connectors, etc.

Connectors with special structures according to special requirements:

Special structural connectors include element insertion and extraction connectors, rubber connectors, rotary connectors, detachable connectors, and fiber optic connectors.