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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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28 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
96 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
53 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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10 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
37 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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44 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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79 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
35 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
68 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.
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90 views

Software controlled variable voltage AC supply with SSR relays

I have an autotransformer like this one : I would like to control it with an arduino solid state relay like this one: What would happens if I wire every output of the transformer together to the ...
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2answers
127 views

Do I need to limit logic current into this SSR

This Opto22 OAC5 (datasheet link below) relay has a logic input current of 12mA. I am building a transformer/rectifier to feed the logic switch. Can I just connect the power to the input or does it ...
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36 views

Analog Switches for decoupled Signal

I am currently working on a small board just for learning about PCB-Design and some analog stuff. Hence, I am pretty much a noob in this domain. I want to measure the impedance of a device, however ...
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33 views

Rectify 6VAC to DC for solid state relay [duplicate]

I need to rectify 6VAC to DC to trigger a solid state relay that needs 2.5-8vdc, can I use 4 diodes and if so does it need a "smooth ing capacitor" and what value? Thank You
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29 views

Achieving minimum load current for a zero crossing SSR relay for weak loads

I'm trying to achieve the minimum load current for this AC SSR which is 50mA. My previous question revealed that zero crossing SSRs need minimum load current operate. I didn't want to ask many ...
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1answer
27 views

Circuit to a/b switch like a relay would. So an analog or digital signal can be turned on or off or routed

I need to build an arduino-based switcher / router for a multi-arcade to route controls to different game boards, and also switch 2 vga inputs into one output. Without introducing any lag also. 3 ...
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2answers
62 views

A question about using optocoupler instead of FET for longer signal wires

After my previous question I had concluded to use the following circuitry to operate this solid state relay: But now I found out that, from the micro-controller(Arduino UNO) digital output pin to the ...
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2answers
72 views

How to size these resistors for the MOSFET gate or are they redundant for this case?

I want to control this solid state relay through a 0/5V digital output. The digital output should not draw more than 10mA so I will use this FET transistor. 12V DC power supply is used to switch the ...
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1answer
106 views

Electronically connecting/disconnecting device from a CAN bus

What I'm trying to do can be best described by the following circuit based on an electromechanical relay: simulate this circuit – Schematic created using CircuitLab However, is there a simpler ...
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2answers
103 views

Component values

Can somebody clarify the following points for the MOC3041 sample circuit given at their datasheet: What are the wattages of resistors at the HOT side What is the difference between 360Ω and just 330 ...
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1answer
57 views

Replace a relay with an analog switch

I'm trying to replace a relay with a SPDT cmos analog switch MAX4678 for switching a sine wave, The switch is powered with dual power supply +5/-5 and +5 to its V_logic pin. This is what i got in ...
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0answers
39 views

Need help in understanding connecting a relay with an IR receiver

I am trying to follow and wire up the circuit given here. The explanation is in this page. In the circuit, IR1 is the component which has an IR receiver connected to a relay. From my understanding ...
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1answer
33 views

25A SIP Solid State Relay Question

I have been testing with the SSRF-240D25R to see his application on shutting down a load current that in my case is mains powered from the grid. In order to see if the relay stops the currents flow ...
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1answer
74 views

Command Solid State Relay using NPN transistor 2N2222 [duplicate]

I'm trying to command a Solid State Relay with the HV1 pin, I can't connect it directly(HV1 to CH1) due to the fact that the impedance on that pin is too low and I only obtain 2.8V when connected. So,...
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1answer
65 views

Bidirectional Logic Translator translates to 2.8V instead of ~5

Considering the below PCB with the following scheme, with components inserted, with DC+ connected to a relay's DC+, DC- to DC-. When CH1 is connected to the relay, the voltage between HV1 and HGND is ...
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3answers
43 views

Can I connect DC12v on VAC output (2A 100-240V) relay?

Solid State Relay G3MB This relay's output says "2 A at 100 to 240 VAC". If I wanted to connect something like DC12v 2A to this relay output, It is not going work? It might work, but it will ...
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1answer
77 views

Solid-state relay to control 120v with 2v

I need a solid state relay to control 120v AC with about 2v DC. What I'm trying to do is control a light string with the relay. I just need something simple, where I can stick wires in and out. What ...
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2answers
67 views

Make a one-way switch with a BJT or relay?

I've been trying to figure out how to make a one-way switch with some analogue electronics. i.e.: my first idea was to use a BJT. What I'm trying to find is a design that when the base current is ...
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1answer
108 views

Problem with Solid State Relay based on MOC3061

I was experimenting the circuit below. In the load, I placed the input of a full bridge rectifier. The issue is that the power triac is never activated. Sounds like the zero cross is not working. Is ...
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0answers
31 views

Low Voltage Marx Generator Switch

I have a low voltage Marx generator which is connected to a coil inductor, eventually forming an LC oscillator. I want to find a way to switch the circuit on, but because the voltage is low I cannot ...
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1answer
74 views

Bridge Rectifier as Load for an SSR Circuit

Somehow, I wanted to control the power to a bridge rectifier. I had two ideas in my mind: 1- Using a PCB mounted power relay driven by a transistor (is isolation maintained?) 2- Using a SSR, i.e, a ...
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3answers
722 views

Would I need a zero-crossing SSR for a reflow oven controller?

I'd like to follow this guide to create a reflow oven controller: https://apollo.open-resource.org/mission:resources:picoreflow But I am confused on the zero-crossing SSR. Does it need to be zero-...
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0answers
71 views

TVS protection burnt too easily

It's about an year that I'm using TVS diodes to suppress spikes from the AC motors (240V - max 240W) that drives my roller shutters and protect the solid state relay that actuate the motor. What is ...
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1answer
32 views

Relay circuit not working

I have connected my relay with a nodeMCU so that when I give commands to relay through nodeMCU the led connected to relay gets powered up. But after proper connection also it doesn't power up.
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1answer
444 views

Can a Solid-State Relay Control AC Powered Fan Speed Via PWM

I'm working on a project where I'd like to control the speed of an AC powered box fan using a microcontroller. I am wondering if this can be accomplished by using a PWM output to control a solid-...
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3answers
260 views

Solid state relay voltage current rating

I am looking to use a solid state relay like this one . This relay has a peak load voltage of 350v and continuous dc current rating of 110mA. My question - if I wanted to control 12v @ 1A DC through ...
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2answers
136 views

A Drone 1900w led lightning flasher with a ssr problem. Help please

I'm a lighting technician that works in the UK film industry. I was really hoping some one could help me with a SSR switching issue. I have built a led lightning flasher to simulate storm lightning ...
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1answer
89 views

Relay model for controlling the Air Conditioner power supply

I am trying to control my Air conditioner via MQTT protocol. I just want to make the power on and off. How can I calculate the relay current rating for 1126 Watts of power? Link to AC model: https://...
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82 views

Should I use a mechanical or solid state relay for a hairdryer

I have a device that needs to use a controllable source of hot air. I want to use a hairdryer as they're available everywhere and very cheap too. I have a board with these relays on it (and I'd be ...
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1answer
50 views

Resistor for solid state relay (CPC1008N)

I have solid state relay (CPC1008N) Dataheet here. What is the resistor I need to use to connect it to a power supply with an output voltage of 4.5 volts?
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2answers
789 views

What symbol to use for a solid state relay in a schematic?

What symbol should I use to indicate a solid state relay in a schematic? The internal schematic of the solid state relay is shown in the data sheet, but showing all of the internal components in the ...
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1answer
185 views

Connect two different sources with two Digital Ouptuts using an Adam 4055

I would like to operate an Adam 4055 module to control two different applications having their own power supply. Adam 4055 is Digital Input/Output control module over RS-485, I use only the DO part ...
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3answers
2k views

Can we switch ground in relay

I am having a 3 pin relay used in bike horns. My need is to turn on and off ground using the positive as trigger. That means the positive terminal of the device is connected to the 12v supply. Usually ...
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1answer
58 views

Help with circuit to alternate a light switch with solid state

I have designed a PCB that allows me to turn a light on with a mechanical relay. The difference between your average implementation here is that I also wired the board up to a wall light switch which ...
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1answer
47 views

Discharge of a coil powered by parallel transformers

I have the following circuit: I basically have 2 transformer, one is 230V-8V the other one has a ratio of 1:1, so 230V on the secondary. I'm rectifying the two signals with two full bridge ...
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2answers
172 views

Relay or optocoupler to switch thermostat wires

I'm doing a project to replace my thermostat with a DIY one. I'm trying to figure out how to switch the heating/cooling/fan/humidity wires. I'm inclined to go with an optocoupler like the 4N35. It ...
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2answers
347 views

Replacing a relay with an SSR

What to replace a relay with? I read the above article and its links, and the main article is from 2002. I wonder if they haven't solved all/most of those issues with SSR's by now. Also I watched ...
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2answers
128 views

SSR to replace the contactor

Can I use SSR to replace the contactor for a water pump? So that one hour works and one hour is off. Does this work damages SSR?(for example pool purification pump)
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1answer
58 views

Electromagnetic Relay versus G-Force

I have an electromagnet-based SPDT relay that I am considering using inside a model rocket. It is estimated to experience between 10-20G of acceleration. Should I worry about the acceleration ...
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2answers
255 views

Controlling millivolt fireplace with Wi-Fi wall switch

My whole house is setup with Wi-Fi wall switches. They're just like basic 110V wall switches, but they can be controlled via Wi-Fi. I'm in the U.S. I'd now like to enable my fireplace. The fireplace ...
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2answers
69 views

Electromechanical or Solid State Relay Low Duty Cycle 1/2 HP Motor

i'm hoping someone can help me decide the best relay (in my scenario) for controlling a 1/2hp inductive load from 110-120v motor. I've spent numerous days researching this and hoping someone with more ...