The main components of the relay
Thermal Reed Relays are a new type of thermal switch that utilizes thermo-sensitive magnetic materials to detect and control temperature. It consists of temperature magnetic ring, constant magnetic ring, reed switch, thermal installation, plastic substrate and some other accessories. The thermal reed relay does not use the coil excitation, and the magnetic force generated by the constant magnetic ring drives the switch action. Whether the permanent magnetic ring can provide magnetic force to the reed switch is determined by the temperature control characteristics of the temperature magnetic ring. The reed relay is a relay that generates a magnetic field by a coil to act as a coil sensing device. So the characteristics of reed relays, small size, light weight, fast response time, short beating time and other characteristics.
Solid state relay is a two terminals for the input, the other two terminals for the output of the four-terminal device, the middle of the isolation device to achieve the input and output isolation.
Solid state relays according to the type of load power can be divided into AC and DC type. According to the switch type can be divided into normally open and normally closed type. According to the isolation type can be divided into mixed type, transformer isolation type and photoelectric isolation type, with photoelectric isolation type is the most.
Thermal Reed Relays
When the whole piece of ferromagnetic metal or other magnetic material close to the time, the action occurs, open or close the circuit. It consists of permanent magnet and reed. Permanent magnet, reed fixed to a non-magnetic or non-magnetic support. The axis of the north and south poles of the permanent magnets shall be the axis, which should coincide with or substantially coincide with the axis of the reed. From the distance and near the adjustment between the permanent magnet and the reed switch between the distance, when the reed switch just happens (for the normally open reed tube, become closed; for the normally closed reed switch, turn off) , The position of the magnet is fixed. At this time, when there is a single magnetic material, such as iron plate at the same time close to the magnet and reed, the reed switch will occur again, to return to the state when no magnetic field; when the iron plate away, the reed That is, the opposite direction of action. Reed relay structure is strong, the contact is sealed state, high durability, can be used as mechanical equipment, location limit switch, can also be used to detect iron doors, windows, etc. are in the specified location. Optical relays for AC / DC and use of semiconductor relays, refers to the light-emitting devices and light-emitting devices integrated devices. The input side and the output side are electrically insulated, but the signal can be transmitted by optical signal.
Its characteristics for the life of semi-permanent, small current drive signal, high impedance insulation voltage, ultra-small, optical transmission, no contact ... and so on.
Mainly used in measuring equipment, communications equipment, security equipment, medical equipment, and so on. Time relay is a use of electromagnetic principle or mechanical principle to achieve delay control of electrical control. It is a lot of type, with air damping type, electric type and electronic type.
In the AC circuit often used in the air damping type time relay, which is the use of air through the principle of throttling to get the delay action. It consists of electromagnetic system, delay mechanism and contact three parts.
Time relay can be divided into power delay type and power delay type two types.
Air damping type time relay delay range (0.4 ~ 60s and 0.4 ~ 180s two), it is simple structure, but the accuracy is low.
