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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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. ...
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 (...
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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 ...
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Driving 2-way synchronous motor valve with SSR
I need to control a 2-way 3-wire 230VAC synchronous motor (6W) driven HVAC valve with SSR. (This is a custom thermostat with heating-cooling valve controller).
The valve internal circuitry is ...
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Seeking Advice for Upgrading Brake Control System with PWM [closed]
I'm working on improving our system's mechanical brake control mechanism. Currently, the brake is controlled by relays, but there are issues with oscillations (because it is a sudden and not smooth ...
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DC Motor suddenly stalls when connected through SSR
I am trying to control a motor remotely by using a relay. The relay is rated for 5-60 V DC, 100 A. The motor is a brushless DC motor, rated for 48 V, 10 A continuous.
The relay switches on once the ...
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Solid-state replacement for a mechanical switch for a DC motor
I have a battery-powered circular saw. The design looks very simple, basically a 18-20V lithium battery pack connected through a mechanical switch to a "895" brushed DC motor. The switch ...
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Need to boost the voltage and current from a digital output to drive a SSR [closed]
The SSR needs 4 VDC at 8 mA. The digital output is 5V with 2.5 mA. Tried a Mikroe Boost 6 Click and it caused the relay to chatter. Tried an Adafruit PowerBoost 1000 and it loaded the digital output ...
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How many SSR relays can be driven from a RP2040 GPIO
So I have tested and confirmed that I can use an G3VM-61GR2 solid state relay to switch an amplified audio signal. I would now like to understand how many of those I can safely drive from the GPIO of ...
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MOSFET Solid State Relay Gate Voltage Issue
I'm trying to build a switch for a high frequency, high-voltage AC signal required for a research project. I have these two circuits and I don't understand why they behave differently. Note that these ...
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Solid state relay that can switch amplified audio signal using a control voltage
I want to evaluate whether I can switch an amplified audio signal (AC, load 8 Ohms, e.g. 20W) using a solid state relay. I already do this with mechanical relays. So I need an SSR with very linear ...
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Hacking into an electric hoist using SSR's and an arduino. Why is this happening?
So I've been working on hacking into an electric hoist so I am able to control its movements using my Arduino. My idea was to wire into the remote control that comes with the hoist. The remote control ...
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Fast RF switching (Q-switching)
First question so feel free to ask for additional info if something is unclear. Quite a green EE that is very new to RF applications.
To provide some background: I am working on improving a substance ...
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Will a zero-crossing SSR activate with shorted load contacts?
If I have a zero-crossing SSR switching 240VAC (e.g. this LS240D12), will the zero-crossing detection function if the load side is shorted?
I know that zero-crossing SSR's can't be used with DC loads ...
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Shall I use solid state relay to switch DC supply?
What is the best way to switch the DC supply of a device (5V/2A)? Is it against some safety standard to use a mechanical latching switch on the supply line directly, or shall I use a SSR to switch the ...
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Creepage distance in a solid state relay
My circuit has a driver TRIAC optocoupler and a TRIAC.
I want to replace this combination with a solid state relay.
The TRIAC optocoupler datasheet explicitly specifies the creepage distance (distance ...
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When is a zero-crossing SSR recommended for switching power to heating elements?
I am going to be switching power to three 2.7kW heating elements (240VAC, ~11.1A each) using a microcontroller.
I'm trying to decide between mechanical relays and SSRs. The mechanical relays are much ...
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Grounding a node referenced to different ground
I'm currently working on a dual supply solution (POE + DC (called Main_Alim)) for a project.
I want to disable PoE negaciation when DC is present. For this, I need to connect the node between R7 and ...
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How to make 3-phase 230V AC zero crossing detection with Arduino UNO [closed]
I am working on making a 3-phase power control of a heating element using PWM control with an SSR. I have a problem making a zero crossing detection to control the duty cycle of the PWM to turn it on ...
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Is it safe to use an Arduino to control a 3-phase SSR?
I am trying to generate a PWM signal and I came across that Arduino provides PWM output at 3.3 V and 5 V. This is in the range of the SSR (3-32 V) that I am using.
My question is if Arduino is capable ...
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SSR with PWM for a 9kW heating element
I have rather a silly but urgent question. Do common three phase SSRs come with built in control systems or do they have to be controlled with PWM?
I want to buy this SSR.
The datasheet mentions it is ...
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Role of the body diode in a solid state relay
The solid state relay with MOSFETs connected back-to-back (source-to-source) is claimed to work by the mutual action of the body diode according to this website, and this TI paper.
However, I had been ...
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Ideal Diode (TPS2419D) fried by floating DC/DC?
I now have a revised and corrected version of my previous circuit which is functional under the right set of conditions.
However...
While it does work a treat at first start (powering the DC/DC via it'...
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Audio matrix using ESP32 and relays
I want to build a matrix for a pre-amplifier and a second ine for my amplifiers and speakers. The pre-amp one is not my main concern now.
I have 6 amps and 3 pairs of speakers, and I want to be able ...
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Why does my SSR’s heatsink have a small positive voltage?
I have an SSR in open state, split phase 220 across the inputs (heater inline), for now ground is not connected to anything, but I noticed, I have ~6.5 VAC from the heat sink to ground. I checked and ...
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GPIO directly driving a P-channel: voltage too high?
I've decided to simplify my previous "solid-state switch" that has to switch 5A @ 60V.
Instead of using an N-channel MOSFET plus a gate driver (which has to have a charge pump in order to ...
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I'm reading up on building an SSR using MOSFETs, and there is something I don't understand
This webpage goes over building an SSR using MOSFETs.
The author says that in this SSR design there may be problems in its implementation because:
A closer look at the above design suggests that, ...
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Should a flywheel diode be installed for SSR with AC load and DC input?
I have a solid state telay (SSR) that switches a 240 V AC appliances's input based on a 24 V DC input. The relay takes 24 V DC input and controls a 240 V AC connection.
I understand that for DC loads, ...
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SSR or TRIAC for 8kW three-phase kiln
I have a PID-controller that uses VAC as the control signal. The kiln will be heated and cooled in stages with specific speed (t oC per hour), mainly for ceramics with crystal glazes.
Manufacturer ...
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Using a ULN2003A to drive a solid-state relay
I plan to use a MSP430 microcontroller to drive three different DC-DC solid-state relays. The thing is that the MSP430 provides a digital output of only 3 VDC @ 15 mA. (Vol: low-level output voltage).
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Ensure that cable is not disconnected from my custom board
I designed a custom board, the board includes stm32 that turns on a control voltage that operates SSR and the SSR goes to the load:
CTR comes from the GPIO of STM32.
in my custom board, there is some ...
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Drive audio signal through SSR
This question is related to one of my older questions: Push to talk mic over music
I was thinking how to get rid of the mechanical action of the relay so I wanted to know if it is possible to drive a ...
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Difference Between PID Temperature Controller Operating Modes?
I am in the planning phase of an electric furnace project for metal casting. It's a hobby project for me. Most resources I've found online suggest to use a PID Temperature Controller in combination ...
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Heatsink for i4-PAC
I'm using a CPC1998J "i4-PAC" solid state relay in a project that needs to fit in a very slim enclosure (e.g. hopefully around 15mm thickness), and I'm having trouble identifying suitable ...
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SSR firing problems
I am new here and do not have a lot of electronics experience, so please be nice haha.
Anyways, I bought a 100W CO2 laser on eBay at a good price but the reason was that it is actually was sent to USA ...
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SSR won't reset even when the control signal is 0V
I designed a 3-state contactor control circuit.
EVSE_POWER_POSSIBLE, 3V3 from a microcontroller, basically enables the rest of the circuit.
When EVSE_POWER_POSSIBLE is HIGH a blue LED turns on in the ...
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Schematic to connect ESP32 with SSR
I would like to connect the SSR (Fotek-40DA) with ESP32 and use PWM to control the phase angle thereby controlling the power going to the heater. The specs (Fotek-40DA) do mention the input voltage ...
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