Solid state relay/SSR

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Information about Solid state relay/SSR

Published on March 12, 2014

Author: chinaswitchgear



A solid-state relay (SSR) is an electronic switching device that switches states when an external voltage is applied along its n-type and p-type junctions. SSR has a small control signal that controls a larger load current or voltage. It consists of a sensor which responds to an appropriate input (control signal), a solid-state electronic switching device which switches power to the load circuitry, and some coupling mechanism to enable the control signal to activate this switch without mechanical parts. The relay may be designed to switch either AC or DC to the load. It serves the same function as an electromechanical relay, but has no moving parts.
Solid-state relays are composed of semiconductor materials, including thyristors and transistors. Solid-state relays have current ratings that extend from a few microamps for low-power packages up to around a hundred amps for high-power packages. Solid-state relays have extremely fast switching speeds usually ranging between 1 to 100 nanoseconds. Solid-state relays are not easily affected by contact wear. Solid-state relays have several shortcomings: a high susceptibility to damage (a relatively high vulnerability to overloads in comparison to electromechanical relays); limited switching arrangements (SPST switching); a need for finer tuning due to high "on" resistances.

一、DESCRIPTOPN Solid state relay is called “SSR” for. ZG3 series product made by our factory is the latest non-contact electronic switch device with good ON-OFF performance. Its input end only requires tinny control current and can be compatible with integrated circuit of TT land CMOS, etc. The output return circuit adopts two way controlled silicon or big powder transistor to cut on or cut off the loading current. The photoelectric coupler is adopted between the input and output. Because solid state relay is a non-contact switch element made up of solid state elements. Compared with electromagnetic relay, it is more reliable. It has series advantages, such as long service life, little disturbance to surrounding and strong anti-interference performance, etc. it has wide application fields. And it tends to replace the traditional electromagnetic relay and further expands to the fields which traditional electromagnetic relay is not applicable for, like input/out0put interface of computer and program control, electric stove heating constant temperature equipment, digital control machine, remote control system., industrial automatic device, signal lamp, traffic lamp, stage lighting control equipment, instrument and meter, medical equipment, duplicator, color enlarger, and rubber & plastic machine, etc. in some special devices which require damp proof, fireproof and anti-corrosion, and under bad working environment, SSR has incomparable superiority in comparison with tradition with tradition electromagnetic relay. It is an ideal product to replace the older generations of products in relay family (EMR). 二、Model explanation of solid state relay and solid state voltage regulator No. Composition Code and definition 1 Basic ZG3: solid state relay ZG1: solid state voltage regulator ZG33: three phase solid state relay 2 Outward appearance code NA、NC、M、T... 3 Load voltage 2:30-240VAC 3:90-480VAC 4:24VDC 5:50VDC 4 Load current 03:3A 10:10A 40:40A 5 Input voltage B:3-23VDC A:90-250VAC C:560KΩ/2W potentiometer potentiometer D: 0-8.8VDC Application installation for reference Color enlarger, developing & printing equipment, injection machine and air conditioning temp control. Computer embroidering machine, bank note counter and post sorting machine All kinds of packing machines Mine explosion-proof and damp-proof electric equipment Digital control and power control of all kinds of machine tools Neon lamp, stage light automatic control system Drive of all kinds of motors(reversible turn control) Radio specific equipment, refrigerator and full automatic washing machine Automatic instrument meter Power port of computer Industrial automation control; industry photograph and stove cellar automation Automatic office machine AC motor control Intermediate relay and electromagnetic valve control Copier Signal light, transport lamp, flasher Digital control machine, remoter control system Industrial automation equipment Cautions while using 1. Over-current and loading short circuit result in SSR permanent damage. Quick fuse is one of the over-current protection methods. Small capacity may also adopt fuse. Over-voltage protection adopts parallel connection metal oxide varistor (MOV) as well as RC absorbing return inside SSR. The area size of MOV determines the absorbing power. The thickness of MOV determines protective voltage value. Generally, 220V series SSR may choose varistor of 500-630 VDC, 380V series SSR may choose varistor of 700-900VDC. 2. If ambient temperature is too high, the loading capacity of SSR will descend. If the ambient temperature is high or the heat radiation is bad, the chosen SSR should be kept a certain margin. 3. The resistance load should not surpass 60% of rated current. The inductance load should not surpass 40% of rated current. Stord – more sensors , more solutions - 1 -

Category Small horizontal type Small card type Subminiature horizontal type 型号 Type ZG3T ZG3M ZG3V Outline and dimension (mm) 33×25×16 42×26×13 31×16×15.5 Function SSR Many kinds of input standards SSR Insulation Photoelectrical two-way controlled silicon Load Voltage 30~240VAC/90~480VAC/12-65VDC Load Current 1~3A 1~8A 1~3A Leakage current 5mA VoRmVceo(V) 500 di/dt(A/us) 100 dv/dt(v/us) 100 I2 t(A2 s) 18 Output Tj(℃) Max.TJ(C) 90 Input Voltage 3-24VDC/3-36VDC Input Current <40mA Off Voltage 1VDC On Voltage 3VDC Off time 0.5ms DC/10msAC Input On time 0.5ms DC/10msAC Dielectric strength 50Hz,60S 2500VAC Ambient temperature -30℃~80℃(Under non-ice/dewfall condition) Coefficient of safety of working current Dissipative load is 60%/Inductive load is 40% Wiring installation diagram Stord – more sensors , more solutions - 2 -

Category Plane installment type 3-phase AC solid state relay Type SSR ZG3NC ZG33 Outline and dimension (mm) 60×45×24 58×44×32 31×16×15.5 Function SSR Many kinds of input standards SSR With operation display Insulation Photoelectrical coupler Load Voltage 30~240VAC/90~480VAC/12-65VDC Load Current 10~40A 1~120A Leakage current · 100VAC 5mA · 200VAC 10mA VoRmVceo(V) 1000 di/dt(A/us) 200 dv/dt(v/us) 400 I2 t(A2 s) 25-3000(Bigger current, bigger consumption) Output Tj(℃)MAX 100 Input Voltage 3-32VDC/90-250VAC Input Current <40mA Off 1VDC On Voltage 3VDC Off time 0.5ms DC/10msAC Input On time 0.5ms DC/10msAC Dielectric strength 50Hz,60S 2500VAC Ambient temperature -30℃~80℃(Under non-ice/dewfall condition) Coefficient of safety of working current Dissipative load is 60%/Inductive load is 40% Wiring installation diagram Stord – more sensors , more solutions - 3 -

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