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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 ...

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52 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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34 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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30 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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36 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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58 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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40 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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72 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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63 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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59 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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29 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
33 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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616 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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51 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
29 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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141 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
196 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
125 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
69 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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70 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
45 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
194 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
158 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
535 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
53 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
44 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
87 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
159 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
65 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
49 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
67 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
48 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 ...
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2answers
174 views

Omron G3MB-202P SSR reset loop

I am using an Omron G3MB-202P SSR to switch an AC outlet on and off as depicted in the below sketch. This works fine. However, when connecting a phone charger to the "controlled" AC outlet while the ...
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1answer
117 views

Effects of rapidly pulsing DC inductive load on solid state relays

I'd like to use some solid state relays to turn on and off a high voltage, low current DC inductive circuit (120-150VDC, 20-60ma). The SSR would only be switched on and off at a maximum of once every ...
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1answer
140 views

Am I using AC relays correctly?

My original question was put on hold because a number of people found it confusing. Drew figured it out, however, and set me down the right path with relays (not diodes). There is still one issue ...
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68 views

Recommendations on gate driver circuit to pass +/-230V AC?

I am looking for recommendations on how i would implement a circuit to drive a mosfet that will pass 230V+/- AC. I was thinking of using a gate drive transformer but i am unsure on how to approach ...
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1answer
123 views

Thermocouple noise causing spurious reading with SSR

I have a thermocouple PID SSR heater as shown, based on the MAX31855 ( datasheet ). I get spurious readings when the arduino is plugged into my laptop, my laptop is plugged in to its charger, and the ...
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259 views

Using TRIAC to switch AC load at specific phase

I have built a simple circuit to switch an AC load. Here is the setup: 230 VAC transformed down to 8,5 VAC. 8,5VAC fed into H11AA1 using current limiting resistors. The pulses from the zero crossing ...
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3answers
212 views

Light bulbs are blinking when controlling powerful heater with PWM via SSR

I'm creating a diy sous-vide rig using esp8266, a tubular heating element (1.5 kW) and a solid state relay (zero- cross, Fotek SSR-25DA) I use a relatively powerful heating element, so that the water ...
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1answer
97 views

What could have gone wrong with my TLP222A?

I'm using a TLP222A to switch a 24V load that never pulls more than about 200mA. My circuit looks like this, ignore that the chip name is wrong. I have 4 of these connected to 4 GPIO pins. 2 of them ...
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1answer
91 views

Sizing Resistors for Voltage Divider Circuit Feeding Solid-State Relay

I need some assistance in sizing the two resistors for a voltage divider circuit in order to drop from 48V DC to somewhere in the 4V-32V control voltage range of the Crydom DC100D40C solid-state relay....
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3answers
455 views

Selecting Flyback Diode for Inductive Load

I intend to run a 48V DC water pump which uses this motor (http://www.leeson.com/leeson/searchproduct.do?invoke=viewProductDetails&motorNo=098382.00&productType=0) through a solid-state relay ...
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1answer
72 views

Transistor switch - extra resistor required?

I am new to electronics and this forum, and am in the process of building a Raspberry Pi based homebrew controller. Following the article in the eLinux wiki, here is the relevant part of my circuit: ...
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6answers
392 views

Using an op amp as a switch for audio (Dual supply +-12V) [closed]

I'm wondering if the below circuit would be a reliable bipolar analog swtich. I'd like to be able to disable signals from certain circuits and I'd rather not have to bias and normalize the signal in ...
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1answer
48 views

Connecting a PhilipsHue led output to a relay

I followed an Instructables tutorial to get some understanding of what pins can be used from the Hue light bulb. Out of all the "exposed" pins, I focused on ...
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2answers
329 views

SSR Relay to replace 3-Way Switch

Alright lets start this over. After getting spanked for a crappy multiple question rambling with terrible schematics to go with it, a few pointers of what I missed in the data sheets, I have a new ...
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1answer
39 views

SSR Switches Off Intermittently By Itself

I have a 24 ~ 380 V 100 Amp AC relay. It can be driven between 3 ~ 32 V, and I'm using a Raspberry pi to drive it with 5 V. The relay has a red LED that indicates it is "on". When checking up on the ...
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1answer
566 views

dry contact control relay - Am I on the right path

Need help understanding a dry contact control relay. My goal is to cut power to an electronics module ( 100 mA max ) with a contact closure input to the relay. By "contact closure" I mean simply ...
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37 views

PWM based control of MOSFET with two DC power output sources

I want to use a pwm pulse (high or low and constant) to select between two isolated dc battery sources as outputs. Both as the same voltage (24-25v) just different cell chemistry. Current will need to ...
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2answers
203 views

Using SSR relay

I want to disconnect a negative of a battery connected to a DC motor using SSR relay.can we do it with ac load switching SSR
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2answers
85 views

How to reliably switch a DC analog signal that can vary from 10mV to 12V, and 1mA to 100mA

Preface: I'm a Controls Engineer, not an EE. I currently have a system that tests resistance through a Device Under Test using voltage drop. I am using 12 Phoneix Contact PLC-RSC relays to alter the ...