什么是电磁继电器？电磁继电器的工作特性

What is an electromagnetic relay? Working characteristics of electromagnetic relays
Electromagnetic relay is an electronic control device that has a control system (also known as input circuit) and a controlled system (also known as output circuit). This control device is usually used in automatic control circuits, which use smaller current and lower voltage to control large current and high voltage "automatic switches". Therefore, it plays a role in automatic adjustment, safety protection, and conversion circuit in the circuit.
Electromagnetic relay (electronic relay)
电磁继电器一般由电磁铁、衔铁、弹簧片、触点等组成。工作电路由低压控制电路和高压工作电路组成。电磁继电器还可以实现远程控制和自动控制。只要在线圈的两端施加一定的电压，就会有一定的电流流过线圈，产生电磁效应。在电磁力的吸引下，电枢将克服反弹力并吸引铁芯，从而使磁芯的运动联系我们 (常开联系我们) 吸引磁铁。一旦线圈失电，电磁吸力也随之消失，衔铁就会在弹簧的反作用力下回到原来的位置，使运动联系我们脱离原来的静止联系我们 (常闭联系我们)。这样就实现了吸放，达到了电路中导通与断开的目的。对于继电器的常开和常闭触点，在继电器线圈不通电时处于断开状态的静电触点，可称为常开触点; 处于接通状态的静电联系我们称为 “常闭联系我们”。
Thermal reed relay
Thermal reed relay is a new type of thermal switch that uses thermal sensitive magnetic materials for temperature detection and control. The device consists of temperature sensing magnetic ring, constant magnetic ring, reed tube, thermal conductive mounting plate, plastic substrate and other accessories. The thermosensitive reed relay does not use coil excitation, but is driven by magnetic force generated by a constant magnetic ring to operate the switch. The ability of the constant magnetic ring to provide magnetic force to the reed tube depends on the temperature control characteristics of the temperature sensing magnetic ring.
Solid state relay (SSR)
A solid-state relay consists of a four terminal device with two terminals as input and the other two terminals as output, with an isolation device used in the middle to achieve electrical isolation between input and output.
Solid state relays can be divided into two types based on the type of load power supply: AC and DC. According to the type of switch, it can be divided into normally closed and normally closed. According to the isolation type, it can be divided into hybrid type, transformer isolation type, and photoelectric isolation type, with photoelectric isolation type being the main type.
Solid state relays are a branch of relay products that use semiconductor devices to replace traditional coil manufacturing, without relying on the movement of mechanical components to control the opening and closing of switches, effectively improving reliability and service life. Because there is no need to wrap around, there will be no electromagnetic interference or contact with sparks, which greatly improves safety. Solid state relays have low power and are more suitable for high-end products, meeting national energy-saving and environmental protection requirements.
Nominal operating voltage.
The voltage required by the coil when the relay is working properly. It can be AC voltage or DC voltage, depending on the model of the relay.
Direct resistance.