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Questions tagged [solid-state-relay]

A solid-state relay (SSR) is a switching device that accepts a small control signal to control a larger load current and/or voltage. In many ways they perform the same function as an electromechanical relay without any moving parts, they have many advantages but also some disadvantages compared to a mechanical relay.

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1answer
36 views

Correct way to add LED in front of SSR?

Looking at at adding a simple LED indicator in front of an solid state relay. Not sure if its more correct to put it in series or use two different resistors as shown in the example. The indicator LED ...
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44 views

Solid State Relay Input Current

The keying circuit buffer I was using failed while using my Ham radio. The radio outputs 12VDC 10mA max. current. When the external keying circuit transistor failed, the RF board in the radio where ...
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3answers
720 views

How to control the output voltage of a solid state relay

Considering this solid state relay: The output voltage can be from 24 to 380V. How can I control this voltage? Is it proportional to the input voltage? What I need is a voltage regulator that can be ...
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1answer
33 views

is it necessary add snubber network for a SSR made by mosfets?

I am designing a control circuit for AC/DC loads. To achieve this, I am using a SSR made by mosfets https://datasheet.lcsc.com/szlcsc/Vishay-Intertech-LH1546AEF_C142599.pdf However this is not a ...
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1answer
53 views

Choosing a Solid State Relay for an AC air compressor application

I just started working with/reading about solid state relays last week, so bear with me here. I have an air compressor -- 120 V | 60 Hz | 2.8 A -- that I would like to operate with a control signal ...
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53 views

RC Snubber for Air Conditioner SSR

I have a window/Wall AC 2 Ton (240V X 15A = 3600W) I'm trying to control it via SSR to use Central AC thermostat board on it which is working good on fan level and all but I need a relay to switch the ...
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1answer
105 views

Designing an analog high voltage multiplexer

I'm putting together a design for a vacuum tube tester and curve tracer. The circuit I want to build is capable of powering up a tube and measure the voltage and current at the tube's pins. I would ...
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1answer
96 views

How to switch 220 VAC? (Magnetic relay, SSR relay or triac)? [closed]

I want to switch 220V AC with a microcontroller. Before I used magnetic relays or SSR relays, but now I want to use a triac for this function (like in this circuit) and my load can be any 220 V AC ...
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1answer
28 views

Solid State relay and Limit switch

I'm building my first CNC machine, it's a 40W Laser Cutter. I'm planning on adding a security feature that cuts the laser power supply if the enclosure door is open during while operating. I want to ...
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1answer
52 views

Switch LED with Solid state relay (PhotoMOS)

The SSR is a PhotoMOS AQY211EHAX rated to drive 1 amp. I seem to be shorting the output side of the SSR. Is a pull down resistor normally required on the output side or am I missing something ...
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1answer
144 views

Why does this Mosfet get Hot?

I have an IRF740 mosfet that doesn't get hot in one circuit but then gets completely hot in another identical circuit and for the life of me can not figure out why. Well the circuits aren't exactly ...
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2answers
44 views

Using a step by step relay along with a solid state relay

I have a step by step relay which is connected to a light bulb and to a manual switch. In parallel with the manual switch I put a SSR. I command the SSR to be on for 0.5 seconds, however the light ...
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1answer
36 views

Help with wiring a temperature controller and a solid state relay

I have a problem that's probably patently obvious to someone in the know but alas, that's not me. Long and short- I have a 240v heating table (aluminum table with silicone heating pads underneath) ...
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1answer
78 views

MOSFET relay as an alternative for TRIAC relay

I use a 2 A TRIAC relay with non zero crossing from sharp in one application. Unfortunately I couldn't find this type of relay, and I want to use another relay (MOSFET relay 2A from TWOARD). Theses ...
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1answer
85 views

Two state switch using transistor (bi-directional)

I have an existing pair of wires driving a servo motor. One of them is +12V, the other one 0V. Depending on the rotation direction of the motor, the voltage flips. I now want to put an optional ...
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117 views

How to measure ON Resistance of a Solid state relay?

I am new to use Solid state relays (SSR). For my application i am using Panasonic 'AQV252G3' relay. i want to measure ON Resistance of this relay, according to the datasheet it ranges between 0.033 ...
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1answer
50 views

Questions about an on-off control comparator circuit driving an SSR

I was doing on-off temperature control for around 40‎°C for an enclosed unit manually by switching on and off a 1100W heater(with a fan) with my hand. The accuracy is not very important roughly 40‎°C ...
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27 views

TRIAC based SSR output wiring COMPARISON

I want to use a triac based SSR (AQH-3213), I checked the datasheet wiring diagram, and it seemed simple. The problem is that its construction is the same as the triac driver optocoupler (MOC3041), ...
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0answers
63 views

Solid State Relay is giving off voltage even when turned off

I'm currently creating a circuit according to this schematics i made. I have removed some irrelevant parts for simplification sake. The SSR in question is a 861SSR210-DC-1. When 5v is applied between ...
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1answer
19 views

Esp8226 with opto mosfet switch LBA110

I want to switch AC load by LBA110 because it has NC switch pole and tiny side. I tried to read datasheet, but with my bad knowledge about electric, I can not find out how to make it work. Is it work ...
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1answer
65 views

How to improve flash time on lights controlled by solid-state relay via Arduino?

My goal is to flash lights around the house on and off to the beat of a song. When doing this with a mini LED and an arduino, it works perfectly with a "flash_time" of ~.1 seconds. This means ...
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2answers
88 views

Why SSRs for heaters?

In the context of building PID controllers for very large heater systems (ovens, kilns, etc.) nearly all the designs I encounter use an SSR to switch the load, a choice I don't understand. The power ...
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1answer
35 views

Can AC voltage phase change across an SSR?

I got an SSR (Picker PCS15-D-240A-25ZL) to control a single phase 240VAC North American circuit going to a heating element on a homebrew setup. One of the load wires goes through the SSR and the other ...
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2answers
60 views

Solid state relay Crydom D1D07 closes and remains closed

I have a Crydom D1D07 solid state relay and the control side is a +5 V DC on terminal 3 and a +3.4 V DC (don't ask) on terminal 4. When terminal 4 is switched to ground (from +3.4 V ...
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1answer
50 views

Asynchronous single phase Motor do not start

I have got from my company scrap an old Alcatel Vacuum Pump. After taking apart the pump and cleaning everything, I tried to make the motor run. Unfortunately apart a noisy 50 Hz the motor don't turn....
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0answers
65 views

Controling a Washing Machine AC Motor Using a Relay

I would like to control the motor of my washing machine using an Arduino. It's an old washing machine with a mechanical controller and an AC motor connected to a 12.5 uF run/start capacitor. According ...
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2answers
267 views

Would it be possible to use a solid state relay as a dimmer switch?

I wanted to make a smart switch with a dimmer using an arduino and a solid state relay. I was wondering if this would be possible and if their would be any problems if I tried to do so. Also, the ...
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1answer
147 views

Circuit Board Design…Getting Rid Of A Relay and Adding a Choke and Capacitor Filter?

simulate this circuit – Schematic created using CircuitLab Figure 1. Original Schematic Is there any way to get rid of the relay in this circuit? And would it be wise to add in a power ...
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43 views

Usuing P_channel mosfet to make o normally closed switch

Hi, I am trying to implement a normally closed switch. In the shown circuit: Vcc = 16..60V (Vcc>>Vz) The characteristics of the P-mos are: Vth = -1V Rdson = 0,055ohm The circuit works correctly: in ...
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1answer
98 views

Sizing Flyback Diode

I'm working on a project to run a 12 volt 12 amp DC gearmotor via PWM output from a controller. I am using a Crydom solid state relay to power and motor and trying to figure out what diode is correct ...
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2answers
56 views

Creepage on SMT DIP package with an NC pin

I'm having trouble understanding how the CPC1972GSTR can have the specs it does. Here's the datasheet. In particular, it has a blocking voltage spec of 800V, but if you look at the recommended ...
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1answer
152 views

Sequentially driving multiple stepper motors with 1 driver and 1 controller

I am trying to control multiple stepper motors sequentially (only one at a time) with one controller, one driver a multiplexer and a dedicated "relay" circuit (shown in red). The idea is instead of ...
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0answers
94 views

What does Low level and High level mean on a Solid State Relay

I wand to control some 220V lights with 12V but don't want the noise of s normal relay. So I saw these SSR but do not understand what Low level and High level mean. Is high level normally closed or ...
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1answer
54 views

Connecting a space heater through an Arduino-controlled relay

I'm considering connecting a space heater to a relay such as this: http://www.handsontec.com/dataspecs/2Ch-relay.pdf The goal is to control it remotely using a GSM data connection. The relay is ...
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1answer
60 views

Digital pin connected to SS relay: voltage is 2V across control inputs when digital pin is supplying 5V

I have a digital pin, from an ED-008, with 0/5V outputs. However, when I connect the pin to the control inputs of a solid state relay, I only see 0/2V at the relay inputs; the relay requires 3.5V to ...
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1answer
149 views

SSRs influenced by physical proximity?

This is part of a two-head EVSE. The two solid-state relays are used to drive contactors that supply high current power to the vehicles. I used to use a MOC3040 based triac circuit for this job, but ...
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0answers
49 views

Using only one channel of 3-phase SSR

Is it possible to use 3-phase SSR for driving a single phase heater? The other two channels would be simply not connected. Is this going yo work as a single phase SSR? The particular model of the SSR ...
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1answer
118 views

Solid state relay (SSR40) behaves weird

I'm trying to connect a Solid state relay using Arduino Nano. I have a push button on the circuit when press, turn on a water pump (1.5hp). I was able to make the circuit and code for the push button ...
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0answers
26 views

Optocoupler or transistor.. which is good for high load relays using Arduino

I'm a newbie or a beginner with electronic stuffs. I'm trying to switch on/off a 1.5hp water pump using Arduino. I've got a 40 amps solid state relay in which the coil voltage is 12-36v. So for that I'...
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3answers
247 views

Protecting against a SSR failing closed

In a project I'd like to control a heating circuit with an SSR, and I'd need a contingency plan for when the SSR fails closed, and the microcontroller cannot turn off the heating element, which would ...
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1answer
50 views

Protection for Solid State Relay.. Advice please

Please excuse me if this question is not appropriate for this site.. I wish to switch a Pool Pump using a Solid State Relay.. The pump is rated at 10Amps, 240 Volts AC. Allowing for a safety margin, I ...
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1answer
105 views

Relay or SSR for electrical heating from tado smart thermostat?

I have a Tado smart thermostat system to switch my electrical underfloor heating. It offers a simple NO or NC switch. This is rated at up to 6A. (Aside: Tado is not a good company. They provide no ...
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2answers
308 views

Solid state relay does not reset

I replaced some old electromechanical relays by those solid state relays from Wieland to improve the switch speed of my system but I can't manage to switch off the solid-state relay. Here is the ...
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1answer
64 views

Nodemcu responds badly to power swing

I'm using NODEMCU and SSR modules to turn on / off the lamps with WiFi. Nodemcu uses I = 80mA and V = 5v as its input current and voltage (Vin pin). It worked without any problems with a single lamp ...
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0answers
15 views

SSR connection between converter and generator in wind systems.

Can I use the solid-state relay to connect the generator and converter? I want to disconnect the converter and generator at fault conditions of grid. I wonder if SSR can work well under discrete ...
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0answers
40 views

The best type of electronic switch to control the signal coming from a pickup coil on a motorcycle

So, my motorcycle has an ignition system that's not really secure, all someone has to do is pull the ground wire going to the ignition coil and anyone can start it up. The only other way to stop it is ...
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1answer
63 views

How can I determine the voltage the resistive load in this relay?

I am hoping someone can help me understand something. I'm an engineering student trying to analyze this circuit, but am finding myself not understanding and going in circles somewhat. I've searched as ...
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0answers
221 views

esp32 resets when relay switches from ON state to OFF state

When I switch a 12v relay from ON to OFF using esp32 then the ESP is restarted. Also it happens only when there is an AC load. I control 12V relay with a transistor. This is my relay How to solve ...
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2answers
120 views

Protecting a relay/SSR when driving AC window cover motor

I'm having trouble switching an AC motor. Relays spark and glue contacts, and SSRs start to flicker and not pass the full input after a while. The motor has 3 terminals for 230VAC mains. One is ...
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4answers
77 views

How to find max load limit in datasheet?

I have а datasheet but I don't understand: how to find max load limit in datasheet? Can I use this SSR to switch the load (12V DC), and what current can I count on? Thanks.