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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, but without any moving parts. They have many advantages, but also some disadvantages compared to a mechanical relay.

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What is wrong in this schematic?

I'm working on a PCB for a nanogrid basically I need to monitor the current/voltage of the renewable energy sources and the battery storage (SoC) and the load state, also transfer all this information ...
Knowledge Seeker's user avatar
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ULx200x V.S. SN7546x

I would like some help understanding the difference between these two Darlington transistor arrays, and which one may be a better fit for my application. I have a 5 VDC 500 mA max. PSU powering an ...
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Why solid state relay turn off voltage is 10 VDC?

Anybody has any idea why some low current solid state relays are design with a must release voltage of 10 VDC? In what kind of scenario that the off signal is up to 10 V? I thought usually off signal ...
user382650's user avatar
2 votes
3 answers
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Using a solid state relay, NC type to control an AC load

I need to control the shutdown of a load that operates with a voltage of 25V and a maximum RMS current of about 90 mA. This load is working almost always and rarely needs to be turned off. For which, ...
Fabián Romo's user avatar
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1 answer
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Zero-Current-Switching Circuits

I'm basically driving an AC fan from 120V AC wall power (use of classic magnetic mechanical relay or solid-state relay is fine, but I'm weary of triacs because of their EMI and their wasted voltage ...
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Heating element with SSR

I have a 3-phase, 240 V, 3 kW heating element that I intend to control via PLC ==> PWM==> SSR. In case this control methods fails electrically, how do I prevent (limit) my heating element to go ...
idir93dz's user avatar
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Switching 600 V, 5 A with >100 megohm isolation

On our robot, we have several 1.5 kW DC motors (either <350 Vdc @ 5 A max, or <650 Vdc @ 3 A max : the PCB I'm designing should accept both options). The command logic is embedded into the ...
Sandro's user avatar
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Converting a NO solid state relay to NC

AQV258 is a SSR RELAY SPST-NO 20MA 0-1500V I know that it can be configured to be a NC relay instead of a NO relay, but I have been unable to find a diagram on how ...
Noel Trudeau's user avatar
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I want to know for a relay having different contacts some contacts are shown by dotted line and some by solid line. How dotted line contacts works?

I want to know for a relay having different contacts (shown in drawing) some contacts are shown by dotted line and some by solid line. How dotted line contacts works?
Sanam's user avatar
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Welder not passing current from a short pulse

I am trying to use a 5V control signal to operate a solid state relay (datasheet below) https://assets.rs-online.com/v1698808049/Datasheets/e3347be1ffb933a5483cd852b7d90659.pdf Once open, I would like ...
k33g0rz's user avatar
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How can I make this AC current switch turn on at 20mA instead of 50mA?

I've bought this AC current switch, which is sensitive to currents from 50 mA to 5 A on the single AC wire that passes inside its hole. When currents from 50 mA start to flow in the wire, it allows ...
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Solid state relay switch circuit with Omron G3MB-202P

could somebody explain the use of the Zener diode and capacitor in the schematic of a switch utilizing an Omron G3MB-202P?
user3788160's user avatar
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Switching a solid state relay when millivolt difference is detected

I have this circuit that switches a solid state relay whenever a difference of a few millivolts is detected between a \$V_{IN}\$ & \$V_{REF}\$. Full schematic here The above left circuit works ...
Tempus Nomen's user avatar
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Can I modify this AC/AC SSR module to allow it be connected in series with a load at its control pins?

This is a follow-up to my question at: Can I wire an AC/AC SSR input control pins in series with a load? I have this AC/AC SSR module (Fotek SSR-10AA - schematics and pictures added) and I'd like to ...
Rodrigo's user avatar
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Can I wire an AC/AC SSR input control pins in series with a load?

Is there a way for an AC/AC SSR to trigger when current flows between its input contacts? I mean, instead of wiring N and L from the outlet directly into its input contacts (with a switch,) I’d like ...
Rodrigo's user avatar
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Do normally closed solid state relays require current to remain closed? (CPC1106N)

I’d like to use a normally closed SSR to rather quickly discharge a capacitor through a resistor when a circuit is powered down. So, open when the circuit is powered, closed when not powered. I’ve ...
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Can a solid state relay open and close a ground connection to chassis?

Can I use a solid state relay to open or close a ground connection to chassis? I need the ground connected to chassis whenever I operate a BLDC motor because it produces a lot of noise and causes loss ...
ReneArvi's user avatar
1 vote
2 answers
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2 240v AC parallel solid state relays on 2 resistive loads off of L1 and L2

My hope is to keep the solid state relays as cool as possible by dividing the circuit load, it is duty cycled and will run up to 72 hours.
Roger M's user avatar
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Running 2 small cartridge heater and 2 Solid State Relay (SSR) with 1 PID Controller

I wanted to run a heating setup that processes optical fiber for tapering and making couplers (I am in photonics). I aim to reach 810C of temperature, whereas I am getting only 780C. Currently I use: ...
Inan Upadhyay's user avatar
2 votes
1 answer
56 views

Protecting a soldering hot plate with thermal fuse

I am DIYing a reflow soldering hot plate, with an SSR allowing to regulate the hot plate temperature. However, I understand that SSRs can sometimes fail closed, which basically means that this would ...
Jambon's user avatar
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Can I use GPIO logic level converters as tiny low-current solid state relays?

In order to use a GPIO pin to drive a 180 mA mini water pump, the GPIO pin needs to switch a MOSFET or an Optocoupler because it can't safely do 180 mA. I want to run 16 low-current pumps from 16 GPIO ...
Redsandro's user avatar
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3 answers
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Faster alternative to solid state relay

I am currently designing a circuit that includes a solid state relay, the CPC1125 . I chose it because it is one of the faster normally closed solid state relays I found. I want it to be optical ...
DarkBulle's user avatar
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How to use an emergency button for an SSR controlling 3kW heaters

I'm working on a temperature control project for airflow utilizing a 3kW heater, an SSR, and a PID controller. For safety purposes, I need to incorporate an emergency button to immediately cut off ...
portonmg's user avatar
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Solid state relay in parallel with mechanical relay

I'm wanting to switch my hot water cylinder element based on the amount of solar i'm generating. The element is 3kw @ 230v = 13A. I need to switch the element ON for a short time every 15 minutes. ...
John's user avatar
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Using MOV to protect device for heater element

I have a heater element that is controlled by a solid state relay from main power. I know it is customary to place a MOV in parallel when switching inductive loads to clamp the voltage to prevent ...
realm god's user avatar
1 vote
1 answer
54 views

Plenty of power output, but unresponsive SSR?

I have problems triggering a SSR (Solid State Relay) from an industrial robot controller. Gear Solid State Relay: SSR-40DD Power supply: Beckhoff EL2809 (outputs) + EL1809 (inputs) Context Beckhoff ...
AntoineG's user avatar
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0 answers
48 views

solid state relay for 3d printer not switching power

i have a 3d printer controlled by a rasberry pi model 4b. my aim is to use a ssr to turn on and off power to the main board via the rasberry pi. its a dc/dc ssr wired into the power line between the ...
user14687868's user avatar
2 votes
1 answer
96 views

What size should I select for the resistor? I have led and SSR and 24VDC source [closed]

Could you please clarify this circuit with me? I have selected 90 ohms. Please let me know if I need to do something differently here. R=(24-30.3)/20mA= 1035ohm and I select 1Kohm I appreciate any ...
AAS's user avatar
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Solid-state relay input characteristics

I am a bit confused by some of the specification on this solid state relay LD00KM. I am looking at the case in which this relay is used in the 2 Terminal Input (Direct Drive) Configuration as shown in ...
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What does the graph 'Short circuit monitoring interval Vs time' mean in this SSR data sheet?

In one of the Panasonic Solid State Relay (SSR) datasheet,the short circuit behaviour is as shown below : If short detected- > Trip the relay -> Periodically retry untill the fault is cleared. ...
Dynamic_equilibrium's user avatar
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Voltage detected on output SSR while in "OPEN" state

I have an SSR relay ( FOTEK SSR-25 DA ), it has load terminals marked (1) and (2). In normal "open" position there's no connectivity between 1 and 2 - no current whatsoever. The moment I ...
jdevelop's user avatar
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How can I implement an active current limit (with auto-recovery) for a solid state relay (SSR)?

I am using a G3VM-61QVH SSR which doesn't have a current limit feature. I would like to have this feature added through an external circuitry. What are the possible options for me? Note: Typically an ...
Dynamic_equilibrium's user avatar
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2 answers
555 views

Driving SSR with ESP32 3.3V GPIO

I have made up a basic output circuit and it seems to work, but I'm not clear how to size the resistor. I'd like to make sure this works for the long term and I am not overlooking any details. How ...
Spy's user avatar
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1 answer
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Problem with OMRON GV3M-31BR

Hi, I was using OMRON GV3m-31BR to switch 24VDC at 2A(Max) and the 24VDC Switching signal was then used to control the relay by using the voltage divider as shown. The is switching as normal but as ...
Jim's user avatar
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2 answers
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How to Get Started with Triacs

I'm interested in building a solid state relay module at home using a triac. I know the safety risks associated with this project. I'm also aware of the cheap SSR modules capable of the same things. ...
user120632's user avatar
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Custom 240V Infrared Heater Controller

I'm DIY'ing a controller for a few heaters I'm placing on my covered deck, components listed below. I'm using an Arduino Uno Wifi Rev2 to control on/off and a dimmer to adjust the heater output. A ...
saulpower's user avatar
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What kind of relay / switch is this?

What kind of relay, if I'm right, is this? It is used in a PRCD. Pictures from 3 sides.
Teb Ara's user avatar
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2 answers
199 views

Why does this solid state relay have voltage on both terminals?

I have an RA4850-D12 [1] SSR in an injection molding machine. The machine uses 240v, 3-phase power. The SSR is in the diagram for the circuit on page 7 for K81 [2]. You can see that terminal 1 of the ...
Maxthecat's user avatar
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Can SP2T RF switches be considered failsafe?

I am looking for a RF switch that is failsafe. For failsafe I mean: a device that defaults to a useful state during total power loss (no supply voltage, no control voltage) for a RF switch, a device ...
Alessandro Cuttin's user avatar
1 vote
3 answers
312 views

How to implement a solid-state non-volatile switch?

I found this heavily downvoted question about how to implement a non-volatile switch (i.e. a switch that remembers its last state even when power is removed). While the OP asked the question in a ...
Ryan Griggs's user avatar
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How to switch a 200 Vpp AC signal @ 2000 Hz in under 1 millisecond?

I want to switch a ~120 V AC signal with a frequency of up to 2000 Hz. For my application (driving electrolumnescent wire) it is important that the switching duration is not higher than about one ...
Thomas Hirsch's user avatar
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Is there a non-contact voltage detector component out there? [closed]

Basically, I have a wire that I pulled from my lighting setup across the room. On this side, I would like to turn on the lights when the wire "lights up". The LNG wires on this side all come ...
velis's user avatar
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0 answers
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High power boost converter circuit issue

simulate this circuit – Schematic created using CircuitLab I made a dc-dc booster converter circuit. With a 3 mF capacitor, 48V can be boosted to 200V in 0.5 seconds. But for some reason, ...
heyri's user avatar
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1 answer
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MOC3041 typical SSR circuit, when snubber is applied, triac never turns off

I am trying to make this circuit: I got reference from this site, which is very useful, thanking them for info; https://components101.com/ics/moc3041-zero-cross-triac-driven-optoisolator Despite all ...
Amol Vaidya's user avatar
2 votes
3 answers
241 views

Voltage divider circuit to solid state relay

I'm pretty new to electronics but have been trying and researching a lot recently. Mostly for creating simple circuits for escape room puzzles. I've been looking into voltage dividers and yesterday I ...
Nightquest's user avatar
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How can a medium-voltage solid state relay be used in a HV circuit?

Adrian Marsh has a recent video about a VTTC with fractal fern discharges. Incidentally, he talks about introducing a medium-voltage solid-state relay into the circuit which includes a high voltage ...
Hermolaou's user avatar
1 vote
1 answer
110 views

SSR with PCB design improvements

I have worked on this project of my own so I need to confirm that it will work Its a simple SSR with max. current rating of 20A (normal use will be around 13A) I use 40A TRIAC just for safe side(also ...
realprocess's user avatar
1 vote
0 answers
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Driving electronic card with half-bridge gate driver?

I want to switch a system like an SSR instead of a relay with a half bridge circuit, but I can't find a complete example. The question I'm wondering is, can I switch any electronic card with these ...
SergenX's user avatar
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SSR doesn't work, how to debug further?

I have an AQV252GA (datasheet) but it doesn't work. Schematic: Wiring should be type "C" (in brackets): Electrical characteristics: I get no voltage with a DMM between pin 5 and GND-5V (...
NateS's user avatar
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Detailed calculations for DIY SSR (solid state relay) circuit

I just want to understand the calculations for a DIY SSR project. I do know the components required but I don't know how to calculate resistance values for this circuit. Also, what is the output of ...
realprocess's user avatar

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