A relay is an electronic control device, which can automatically switch a controlled circuit to make a difference when given an input value like electrical, magnetic, optical or thermal signals. When the input value drops to a certain extent, it will return to the initial state and then the controlled circuit will also go back to the original state. It has the interaction between control system (input circuit) and the controlled system (the output circuit).
Relays are usually used in automatic control circuits, as the automatic switches which actually can control a larger current by placing a smaller current. Therefore, it plays a role of automatic adjustment, safety protection, conversion circuit in the electric circuit. As one of the most important control elements, it is widely applied in remote control, telemetry, communication, automatic control, mechatronics and power electronics.
Electromagnetic relay (EMR) consists of electromagnetic system, contact system and release spring. Since the relay is used in the control circuit, the current flowing through the contact is relatively small (generally below 5A), so an arc extinguishing device is not required. Electromagnetic relay works in a way of driving the movable part in the magnetic circuit by the electromagnetic suction produced by the control current going through the coil, to achieve the function of contact open, closed and conversion. ATO provides compact-size electromagnetic relays with common coil voltages of 12V/24V/110V/220V for your choice.
The solid state relay (SSR) is a four-terminal device with two terminals as the input terminal and the other two terminals as the output terminal, and an isolation device is used in the middle to realize the electrical isolation of the input and output. Solid state relays are made of semiconductor devices instead of traditional coils, and do not need to rely on the movement of mechanical parts to control the opening and closing of switches, which effectively improves reliability and service life. Since coils are no longer used, problems such as electromagnetic interference and contact "sparks" are not encountered, and safety has also been greatly improved. ATO provides single phase and three phase solid state relays, including DC-AC and AC-AC, with load current from 10A to 120A.
Thermal relays are mainly used for overload protection of motors, and are usually selected according to the type of motor, working environment, starting conditions and load properties. When the motor windings are connected, the thermal overload relay of two-phase structure can be selected. If the grid voltage is seriously unbalanced and the working environment is bad, the thermal relay of three-phase structure can be selected; when the motor winding is connected by △, it should be Choose a three-phase structure thermal relay with a phase failure protection device.
Signal relays are commonly used devices in automatic control systems. They are used to connect and disconnect circuits to issue control commands and reflect equipment status to form automatic control and remote control circuits. All fields of automatic control use relays. ATO signal relays are available from 1.5V ~ 24V. Signal relays play an important role no matter as the core part of the relay signal system or as the interface part of the electronic or computer signal system. The reliability of the action of the relay directly affects the reliability and safety of the signal system.
The safety relay is used in the safety circuit, it's protective barrier upstream the devices in the general control system. Safety relay can be integrated with multi protection, it can even have a safety mode. For a large scale system, safety relay circuit is an important part. The common relay can be used for general overvoltage, voltage conversion, speed and coordination. Safety relay involves safety certification and level, safety relay provides extensible and functional conventional safety assurance, it's commonly used in the expansion of relay. Safety control over the system is higher than ordinary control, which is necessary and widely accepted. Safety relay is generally used for combination of switches, while relay is mostly used for linkage of contacts.
Monitoring relay is a protection device for phase and voltage monitoring of power system or equipment. The relay can be used to monitor important parameters in the power supply system including over-voltage, under-voltage, phase loss (phase failure), three-phase voltage imbalance and phase sequence. Thus, it provides reliable relay protection for motors, pumps, fans, cranes, blowers, elevators, power distribution cabinet and air-conditioning system.
Filter by:Clear All