Relay is an electrical control device. It has a control system (also known as the input circuit) and the control system (also known as the output circuit) the interaction between. Often used in automatic control circuit, it is actually with a small current to control high current operation of an "automatic switch." It plays in the circuit automatically adjust security, conversion circuitry and so on. Working principle and characteristics Introduction
When the input (such as voltage, current, temperature, etc.) reach the required value, the relay output circuits to be controlled is turned on or off. Inputs can be divided into electrical quantities (such as current, voltage, frequency, power, etc.) and non-electrical quantities (such as temperature, pressure, speed, etc.) into two categories. Relay with the fast, stable and long life, small size and so on. Widely used in power protection, automation, movement, remote control, measurement and communications devices. Electromagnetic relay works and features Relay Products (19) are generally electromagnetic relay core, coil, armature, composed of reed contacts. As long as both ends of the coil with a certain voltage, coil current will flow through certain to produce electromagnetic effects, the armature will be attracted to the role of the electromagnetic force to overcome the spring tension to return to the core absorption, so as to drive the armature dynamic contact with the stationary contact (normally open contact) pull. When the coil power, the electromagnetic suction disappeared, the armature reaction in the spring will return to the original position, so that the static dynamic contact with the original contact (NC contact) release. This pull-release, so as to achieve the conduction in the circuit, cutting off the goal. For the relay "normally open, normally closed" contact, it can be to distinguish: the relay coil is not energized in a disconnected state when the static contact, known as the "normally open contact"; in a static on-state contact point known as the "normally closed contacts." Generally has two relay circuit for low voltage control circuits and high-pressure work circuit. Solid State Relay (SSR) of the working principle and characteristics of Solid State Relay [1] is a two terminal for the input, the other two terminals for the output of the four-terminal devices, the use of isolation among input and output devices to achieve electrical isolation. Solid state relays by the type of load power AC-and DC can be divided into type. The switch type can be divided normally open and normally closed type. Isolation can be divided according to type of hybrid, transformer isolated and optically-isolated, with optical isolation for the most. Thermal reed relay works and features Thermal reed relay is a magnetic material using thermal detection and temperature control of the new thermal switch. It consists of thermal magnetic, permanent magnetic ring, reed, thermal installation piece, plastic substrates and other accessories. Thermal Reed Relays do not coil excitation, generated by the permanent magnetic ring magnetic drive switching. Permanent magnetic ring can provide to the magnetic reed switch from the thermostat temperature magnetic characteristics of the decision. Reed Relay Reed relay is a coil generates a magnetic field to control actuation of the reed relay, the coil as a sensing device. Therefore, the reed relay features, small size, light weight, fast response, short beating time characteristics. When the entire ferromagnetic metal or other magnetic material with close to a time when the action open or closed circuit. By the permanent magnets and reed tube. Permanent magnet, the reed switch is not fixed in a non-magnetic with a magnetic stand. A permanent magnet poles of the connection as the axis, this axis should the axis of reed or coincidence coincident. From far and near permanent magnet and the adjustment of the distance between the reed switch, reed switch occurred just when the action (for normally open reed, into closed; for normally closed reed switch, becomes disconnected) when the position of the magnet fixed. At this time, when entire magnetic materials, such as iron and close to the magnet and the reed, the reed will happen again moves back to the state when no magnetic field; when the iron leaves, reed the action occurs in the opposite direction. Reed relays, solid structure, contact is sealed, high durability, the location of mechanical equipment can be used as limit switches, can also be used to detect iron doors and windows are in the specified location. Light Relay Optical relay for the AC / DC and used in the semiconductor relay, light-emitting devices and integrated optical devices by device. Input side and output side of the electrical insulation, but the signal can be transmitted through the optical signal. Characterized as semi-permanent life, small current driving signal, high impedance insulation, ultra-small, light transmission, no contact ... and so on. Mainly used in test and measurement equipment, communications equipment, security equipment, medical equipment ... and so on.
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