What do you think of the symbol on the SSR housing? 30

Answer: 1 Figure is like this: SSR-75AA is AC control solid state relay. The rated current is the load side, and the operating voltage I ranges from 24 to 380 volts AC.

The end is the AC control end, and the operating voltage is between 80 and 250 volts. 2 Figure SSR-25A is a direct control solid state relay, rated current AC load terminal, rated voltage from 24 volts to 380 volts. The end is the DC control end, and the rated voltage is from 3V to 32V.

The control circuit is selected according to the actual circuit.

It is a kind of contactless electronic switch, which is assembled by discrete components, membrane fixed resistance network and chip, using a mixed process to realize the galvanic isolation and signal coupling of the control loop (input circuit) and the load loop (output circuit), and the on-off switching function of the load is realized by the solid-state device, without any movable parts inside.

The end is the solid-state switch normally open contact The end is the solid-state switch control contact, the first is AC control, the second is DC control, DC control has the direction to pay attention to the polarity, and finally all the voltage parameters should not exceed the marked range.

Solid State Relay: SSR Solid State Relay (also known as Solid State Relay) is known as Solid State Relay, referred to as SSR. Solid state relays are a type of non-mechanical as compared to electromechanical relays.

The meaning of normally open, solid state is generally normally open.

The model produced by the manufacturer is different, followed by the current.

See what you think, what model you're looking at, whatever you want.

In general, this symbol represents the model of the relay.

How to look at the symbol on the SSR shell of the solid state relay, you look at this, it shows that he will generally teach you how to look at it.

SSR solid state relays are in the form of triggers, which can be divided into zero voltage type (Z) and phase modulation type (P). When a suitable control signal VIN is applied to the input, the P-type SSR is immediately turned on. When the load current is lower than the triac maintenance current (AC commutation) after VIN is revoked, the SSR is turned off.

The Z-type SSR includes a zero-crossing detection circuit, which can only be turned on when the load supply voltage reaches the zero-crossing zone when the input signal VIN is applied, and may cause a maximum delay in the half-cycle of the power supply. The shutdown condition of Z-type SSR is the same as that of P-type, but it is widely used because the load working current is similar to a sine wave and the interference of higher harmonics is small.

Similar to the basic principle of relays, it has one main control end and one controlled end; When the main control terminal and the controlled end of the SSR are separated by optical coupling, and when the main control terminal and the DC or AC signal reach the critical voltage value or critical current value, the controlled end can be transformed from an open circuit to a path state, so the low-power signal can control the path or open of the controlled end, and then control the opening or closing of high-power loads.

Because the SSR is controlled by an optocoupler between the master and the controlled end, interference and insulation problems between the master and the controlled end can be blocked. When the load is large, the varistor can be connected in parallel at both ends of the load to absorb the surge to avoid damage to the SSR. The voltage specification of the parallel varistor needs to be selected according to the voltage of the load.

Here is an introduction to both the copy of the solid-state relay.

A solid state relay (SSR) is a type of relay that has no mechanical movement and does not contain moving parts compared to an electromechanical relay, but it has essentially the same function as an electromechanical relay. SSR is a contactless switching element composed of solid-state electronic components, which uses the point, magnetic and optical characteristics of electronic components to complete the reliable isolation of input and output, and uses the switching characteristics of high-power transistors, power MOSFETs, single thyristors and bidirectional thyristors to achieve contactless and non-spark connection and disconnection of the controlled circuit.

Solid State Relay BAI

The role of the device du! (Advanced Optoelectronic Semiconductors) zhi

Solid state relays are isolated work.

Therefore, in addition to having the same function as electromagnetic relays, the solid-state relay also has the compatibility of logic circuits, vibration resistance and mechanical impact, unlimited installation position, good moisture-proof, mildew-proof and anti-corrosion performance, excellent performance in explosion-proof and ozone pollution, small input power, high sensitivity, small control power, good electromagnetic compatibility, low noise and high working frequency!

Southern Advanced Electronics.

Advanced optoelectronic semiconductors.

Solid state relays are used in the same way as traditional relays, but the difference is that the principle is different.

The main function of a solid state relay is to achieve contactless switching and disconnection, that is, it does not have an arc when it is turned on, unlike an AC contactor.

Solid state relays also have 4 ports, 2 inputs, and 2 outputs. The output is also turned on when the input interface is powered, and the output is also turned on when the input is disconnected from the power supply. As with conventional relays, DC is the control coil and the AC output controls the load.

Solid-state relay (hereinafter referred to as "SSR") is a new type of contactless switching device composed of solid-state electronic components, which uses the switching characteristics of electronic components (such as switching transistors, bidirectional thyristors and other semiconductor devices) to achieve the purpose of making and disconnecting the circuit without contact and spark, so it is also called "contactless switch".

A solid-state relay is a four-terminal active device with two terminals for input control and the other two terminals for output control. It has both amplified driving effect and isolation effect, which is very suitable for driving high-power switching actuators, which is more reliable than electromagnetic relays, and has no contact, long life, fast speed, and small interference from the outside world, and has been widely used.