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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Understanding Solid state relay specifications

I've been looking for a solid state relay that can switch 240V from a 3.3V signal. Looking at DigiKey, with a very large selection, I'm not sure how to filter my search (screenshot attached). How do I ...
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Raspberry Pi, SSR, Solenoid Valve Power (Multiplexing?)

Background I have a RaspberryPi-controlled irrigation sprinkler system that I am working on. I would like the RaspberryPi and the Solenoid Valve (when the Solid State Relay is closed) to pull power ...
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Solid state relay switching types?

I am switching a refrigeration compressor with an AC control voltage and AC load solid state relay. I need to choose between zero crossing and instant on / random switching. What is the pros and cons ...
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How to select a Relay that can handle a load of 42V, 3A DC?

I want a relay that can be controlled by a Raspberry Pi and can handle a load up to 42V and 3A DC. I was looking at this: relay which is rated at DC 30V/10A. Although, 30V is less than 42V but I was ...
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34 views

Non-shorting SPDT switch using MOSFETs

My goal is to design a circuit using MOSFETs that would switch 12V power to one of the two high-current loads, using high-side switching. Control is done by a 3.3V MCU. The reason for using MOSFETS is ...
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Connecting SSR module to raspberry pi or arduino (HCMODU0115) [closed]

What I'm trying to do I have a Raspberry Pi Zero and an Arduino that I'd like to use for an automation project. I got two of those SSR modules (HCMODU0115), like the one in the picture below. I ...
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Why is my fan circuit with SSRs short circuiting on power down?

I am attempting to build a "smart" ceiling fan for a home automation system I have created and added to over the years. However, this is the first time I've tried controlling a fan motor ...
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1.6V SSR power supply regulation

I am trying to power an SSR opto coupler, and need a maximum 1.6V supply, so that I don't blow the LED. However the main voltage supply is between 0V and 4V, and the minimum zener diode voltage I can ...
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How to protect Relay's NC contact tip from wearing out?

I made a rev limiter by using a 5V SPDT relay on motorcycle between the CDI and ignition coil. The relay works fine. However, the NC contact tip wears out very fast. I added a 1N4007 at NC and COM to ...
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Does a solid-state DIN relay typically need a flyback diode when switching an inductive load?

I'm using this Phoenix Contact DIN rail relay, DigiKey part 277-17665-ND (data sheet). I thought it would be prudent to add a flyback diode, but looking at the data sheet, it vaguely suggests it ...
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Zero crossing solid state relays

For zero crossing relays, does the switching at zero current only limit voltage spikes, or does it also reduce inrush current?
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Advice for Switching High Current Motor (Relay vs. SSR vs. Mechanical Switch)

I'm working on automating an irrigation system which has a large well pump that uses 24-32 volts, directly from a solar array. This was previously switched by a light switch manually, but after my ...
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Is a solid state relay with over 1 MHz driving frequency physically possible?

I could only find one question semi-relatable to mine on SE, but I have a more demanding application in mind. I have designed a 32 stage 40 VAC -> 1000 VDC Cockroft-Walton voltage multiplier which ...
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1answer
44 views

DC Solid State Relay Common Ground

I have an application which would involve having data lines connected to a microcontroller which would signal at lvttl (3.3v) levels and also take in 24v for a resistive load (~600mA). I have ...
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49 views

Single pole or dual pole relay for switching a 3 kW water heater?

I have bought a WiFi controlled device to control a 3 kW, 240 V water heater (immersion heater) wirelessly but despite being advertised as 15 A, it actually has a 13 A relay which has "push fit" ...
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I have a simple circuit with a relay with a SSR. I am getting leakage measured using a multimeter of ~4v. Is there a way to eliminate the leak?

I have a simple circuit. My computer controls an SSR via a 3v dc signal. The load is from a VAC transformer transmitting 10v ac. When "off" I am measuring ~3v coming from the SSR using a multimeter. I ...
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Wiring diagram for laboratory-related aquarium equipment (PID, SSR..)

I am currently in the process of constructing a "thermal aquarium chamber", used to study the responses of various species to warming temperatures in their aquatic environment. The idea is to control ...
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Crydom SSR Crosstalk

Components used: Crydom SSR used PMP2425W Control Voltage 4-20ma (IO Vard) Supply voltage 230VAC (Single phase) Operation - Heater Issue: I am getting cross talk between 4 SSR's when line voltage ...
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Need help in using a solid-state relay with Arduino

Disclaimer: I'm a newbie in electronics, so please pardon my lack of knowledge. I'm trying to automate my water tank filling system with an Arduino Uno. The part I need help with is picking the ...
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96 views

How to switch 1000w AC load with minimal heat?

I am trying to heat a 1000w heating element with 120VAC. I am currently using a thermocouple and SSR to regulate the temperature, but the SSR is getting too hot at full power even with a heatsink. In ...
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31 views

Control 3 phase load with microcontroller

I am designing a circuit to control a 3 phase resistive load (400V & 30A). The idea is to control the circuit with a microcontroller io. Since it will switch very often (1 Hz aprox), i decided ...
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1answer
60 views

Need help designing LiFePO4 BMS disconnect alarm

I need help designing an alarm for a 12v LiFePO4 + BMS system. I am using an off the shelf BMS. The BMS has internal FET switching which may disconnect the battery for a variety of reasons to protect ...
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58 views

Current Sensing Switch

I have built the circuit depicted below in order to start a 10A 220V dust collector(Load 2) when I run my 20A 220V table saw (Load 1). So far, I have not been able to activate the relay to power load ...
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23 views

Piggyback input power from supply power on SSR?

I would like to use a reed switch to control a solid state relay. Could I use the supply power for the control aswell? Thanks for your help. https://imgur.com/gallery/p9oa3Ll
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System that does not work

Hello, i build a system which suppose to run speed control of electric engine, with loginc of Raspberry Pi. Control Signal does not go through SSR. System Connection Logic: (1) RaspberryPi 3 -> (...
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5V across SSR from Raspberry

i have RaspberryPi, SSR-25 with triac inside. RaspberryPi GPIOs are 3v3. It is written that it does work with the voltage from 3V, however 3v3 does not trip the triack - 5V does. Is it safe for ...
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202 views

ESP8266 not working to drive relay

I am trying to drive a 5V Relay using ESP8266-01 module. Following image is the circuit diagram i have uploaded. My sketch is about connecting the esp to the mentioned Access Point and controlling ...
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Solid state relay is not completely open when control inputs are not connected

I am trying to control a 12W light using this solid state relay. Even when I haven't connected my control inputs through an Arduino the output light glows(very dim). I have an input voltage of 230V. ...
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70 views

Triacs are getting damaged BTA41 BTA24

guys, I tried to make an SSR for my window Air conditioner 2 Tonnes "2.5kW" the problem the Triacs get damaged instantly I tried 4 Triacs so far 2 BTA41 and 2 BTA24 I tried different circuits, I'm ...
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'Invert' a logic low and logic high signal from a FM60 controller [closed]

We have an Outback FM60 controller which outputs 0 or 12V as a command, 0 for logic high, and 12 for logic low. I need to invert that for our solid state relay to output 12 for high and 0 for low. ...
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SSR for transformer tap changer?

I need to regulate and possibly adjust an AC output voltage during operation, owing to certain circumstances. Problem is that the unit is pretty much too remote and inaccessible to replace any relay ...
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SSR altern symbol why

Why in the SS relay the connection line 1 and 2 appear a altern symbol, can I use to connect a DC line ? The symbol above 24~380VAC is a capacitor ?
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Inverse time lag relays in protection

I'm dealing now with the different types of time responses of electromechanical relays: instantaneous, definite time lag, inverse time lag, and inverse definite minimum time lag. My question is: What'...
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FOTEK SSR replacing the Triac

I recently bought a few of FOTEK SSR-40DA relays believing that they are 40 A. Anyway I've burned one of then connected to my boiler, and I've opened it, and it turns out that they actually having ...
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35 views

Controlling low wattage SMPS with SSR

I have an AC to DC power supply (specifically the Mean Well RS-25-48 datasheet). When the power supply is not being used, I want it disconnected from the AC mains. I've thinking about using a SSR-...
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Does a hybrid DC relay suffer from contact erosion (albeit much less than normal), or is it effectively eliminated?

Given a hybrid DC relay, I've been wondering if contact erosion is occurring (albeit at a slower rate), or if the design eliminates this entirely. (Assume that there is no snubber or other contact ...
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49 views

Solid-state relay - Integration in circuit

I have an MCP4921 DAC that is controlled by a Raspberry Pi. Then, I have built a Howland current pump circuit that is able to regulate current depending on the input voltage: Both of these work ...
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31 views

Why do AC SSRs have lower AC Voltage limits and what does this mean?

I want to use something like a Crydom D2450 SSR to switch AC current supplied by a variable transformer. This device is spec'd at 24-280VAC on the output. Why is there a lower output voltage limit (...
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solar PV bypass diode v buck boost v SSR

I have 20 185W panels in two strings each to a ginlong GCI-2k inverter. The panels are W facing 45deg, between two pitches with some chimneys. The prediction for latitude and moderate shading is ...
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82 views

Choosing Three Phase SSR

I want to control the power of heating elements with arduino and for this reason I'm looking for help for choosing the correct Three Phase SSR. I'm currently looking at this SSR with Zero Cross Turn-...
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1answer
143 views

Current sensing relay with delay on break for dust collection system

I am in the process of planning our a new workshop in a single car garage. I have a large 20A Dust Collector that needs to be on its own circuit or else it will trip. I also have a ceiling mounted ...
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1answer
48 views

Short-circuit in CAN lines

I have a device with a SNx5HVD251 CAN transceiver. I opened the datashett and read the following parameter: IOS(SS) - Short-circuit steady-state output current Below are two images of the datasheet ...
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41 views

Which parameter to use to specify the relay in a CAN line communication?

I need to use SSRs (solid state relays) to comute lines of comunication to a vehicular OBD-II interface. I will use SSRs to choose wich lines will be used at the pins of the connector. The lines wil ...
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39 views

Looking for a relay

I need to find a relay that allows me to set a defined voltage for the input before closing the output/contacts of the relay. Here is my scenario. The circuits is in DC voltage. I have a pedal in ...
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30 views

SSR selection for dc controlling ac

Hi I am trying to create a circuit that turns on automatically when a multi pin pannel plug is connected (specifically a Weipu connector). The idea is that the 3.3V dc voltage is used to control an ...
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146 views

What does it mean to soft switch a relay?

I am specifying a relay I/O card for a Beckhoff PLC. (Link to an overview of Beckhoff digital output slices, scroll to see Relay section) Some of the relays have ...
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Can I use solid state output and relay output with the same components?

So I have a OTB1E0DM9LP Schinder Electric I/O distributed module and I want use it'output to control some 24v electro-valve's and some 24V contactors. The module have 2 Solid-state outputs of 24V 0....
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51 views

15 second switching circuit

I am designing a circuit that receives a signal from a motion sensor, and then turns on a light for 15 seconds. I have a rough idea on how to make the circuit, but I am also curious what are the ...
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36 views

4-16V SSR control pin with 24V

I need to control 6 SSR inputs. These are 16Vmax rated on the control side. I need to use them with 24V control voltage out of a PCB which looks like has mosfets for output and all positives of the ...
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405 views

A basic solid state relay circuit

I have this solid state relay basic circuit: However there are some details I don't understand. What is the reason of putting R3? And if the gate of the BTA06 needs only 50mA as a maximum triggering ...

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