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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PWM solid state relay output not well modulated with inductive load

I am attempting to control the current through a generator rotor by adjusting PWM input to a DC to DC solid state relay (SSR), specifically a TWTADE SSR-40DD. The power supply for the output side of ...
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Why does this solid state relay circuit work sometimes and not other times? (stuck closed)

It's a very simple open collector output from one device driving a solid-state relay (VO1400) in another device. You can see the power transistors (BS868) that drive OUTn.n in the circuit diagram. ...
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Making an LED lamp smart with IKEA and an SSR - LED is flickering when SSR is on/off [closed]

I have an IKEA LED lamp, that can't be used with a remote control. I've decided to make a circuit with an SSR, where the SSR is toggled on and off with a 10W IKEA LED driver that can be turned on by a ...
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Connecting two DC-DC 0-200V SSRs in series

I want to switch a 400V DC inductive load. I am unable to find 0-400V DC to DC switching SSR. Can I use two DC to DC SSR of 0-200V in series to achieve the goal?
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Kiln SSR zero-cross frequency

I am planning on using a WATLOW DC2T-24C0-0000 power controller for a three phase electric kiln. It is a zero-cross 3 phase, 2 leg controlled contactor capable of driving 46 amps with its huge heat ...
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Relay Replacement (Datasheet Questions)

I need to replace the following relay: 941H-2C-5D The datasheet can be found here: https://datasheet.lcsc.com/lcsc/Hsin-Da-Precision-941H-2C-5D_C259268.pdf From what I understand from this datasheet ...
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What PWM frequency should be used for a solid state relay (SSR)

I am planning to use an SSR (see product here) to PID control the temperature of a heat bath. According to the SSR40-DA the response time is < 10ms so I would go for a PWM frequency that is well ...
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Can I run a 775 DC motor with DC solid state relay? [closed]

I want to run a 775 DC motor with 12V DC power battery.DC motor link:https://www.nbleisonmotor.com/RS-775-Dc-Micro-Motor-pd6675924.html I didn’t find any suitable controller for this. The controller ...
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Need to monitor an SSR with an arduino

I need to monitor the coil side of an SSR (not actually a coil I know). The problem with my circuit is it allows enough current through the resistor divider to 0V to actually turn on the SSR. Just ...
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SSR failed close and did not respond to commands (possible overheat). A day later, it works again. Why?

A cheap SSR rated for 40A is used as a switch for 2x 4500W heating elements in parallel (around 36A). It is used in 0degC temperature with a heat sink that might not be large enough. After 2 hours of ...
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Is there anything wrong with this SSR circuit?

I am a mechanical engineering student currently interning at a small company. We make solenoid valves and some tests require that we cycle the valves many times. This is a circuit that I came up with ...
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SSR relay module - AC switching only but need DC switching

I'm using an SSR module with a Raspberry Pi to control electromagnets (12V DC, each using 0.3A). I didn't realise the module is only for AC switching (the SSR is G3MB-202P), so it's not behaving as ...
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Always stop the motor at the same position [closed]

I asked this question 13 days ago electronics.stackexchange. DC motor has to stop always same spot. If we take the area where the motor starts to rotate as 0, the motor should always stop at 0 degrees,...
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Automatic battery backup from mains to battery bank on power outage

I've looked for solutions and cannot find anything that's clear to me that accomplishes what we need. Components: 12V furnace 8A load (fan) 120V to 12V adjustable power supply 12V backup battery bank ...
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Furnace circuit ideas: constant temperature with thermocouple & heating element

I am wanting to make what we will just call a furnace that will always operate near 1800°F. I'm looking for circuit ideas or a direction in order to maintain the temperature of the furnace. The ...
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Are SSR Relays suitable for inductive and capacitive loads?

I want to knowingly buy a cheap knockoff SSR Realy from some online sellers. The SSR Relay is advertised as not to be used for inductive or capacitive loads. My application is switching on or off a ...
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Want to create an alarm that senses 12 V and 240 V

On my boat I would like a warning buzzer to sound if the battery charger is on and the engine batteries are not isolated. Because if you start the engine with the battery charger on, the diodes in the ...
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2 votes
1 answer
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Solid state relay versus n-MOSFET for controlling large loads with a microcontroller?

Let's say I'm trying to control a relay using a microcontroller. This relay requires a 500mA input current which is too large for a microcontroller to drive. It seems like I could use either a n-...
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Energizing a relay with a lower coil voltage than my power supply

I'm using a 72 VDC power supply to drive some equipment. I need to drop that voltage down to 48 VDC to drive a relay I'm using. What are my options to energize the relay coil and what specs do I use ...
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Using a relay to turn PWM signal ON/OFF

I've been gaining understanding about using relays to control PWM signal (ON/OFF). Setup: Pixhawk generates PWM signals and sends it to motor controllers to control the 24V DC motor's speed. Goal: To ...
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Solid state relay output connection: Is there a difference between high side and low side switch configurations?

I am planning to use this SSR chip. I decided to use the "Connection C" configuration which is given pictured in the 2nd page of the datasheet. However, there is something I don't like ...
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Best practices to avoid a MOSFET switch failing closed

I am designing a high-side solid-state relay to replace a mechanical solenoid. The solid-state relay uses an array of high-power MOSFETs connected in parallel. It has been tested and successfully ...
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3 answers
115 views

How to trigger an 8 channel relay module with an air coil and moving magnet

I just bought this 8 channel relay module on Aliexpress, and I'd like to try to trigger it using an air coil and a moving magnet, but I'm unsure how to connect the coil to the trigger and collect the ...
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SSR rating to consider for a stepper motor driven by a Closed loop driver

I am operating a stepper motor (Nema 23) with a closed loop motor driver (CL57T). The Driver that operates within 24-48V DC (36V typical) with peak current at 8A. I am planning to connect an SSR or a ...
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How do I determine the input voltage for a solid state relay?

5v + 1k ohm resistor input to PVG612PBF (SSRelay) Datasheet Is this the correct voltage/resistor to suit this relay? If not, how would the voltage or resistor be selected for this specific SSR? How do ...
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Is it possible for this kind of solid state relay to drive high side?

I require a solid state relay to be able to switch high side, but also has low on-resistance. G3VM has low on-resistance but it's application diagram shows exclusively low-side switch. Question: ...
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SSR for Attiny85 using Optocoupler and Triac

Looking for some advice, I am trying to create an onboard SSR to control the switching of a 120VAC load (heater/lighting), with an operating power of around 1500W max. I chose the following parts and ...
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Special project elevator floor lamp

I am building a floor lamp made of vintage elevator directional lenses removed from an old hospital. The lenses are from the 50's. I want to simulate an elevator theme for this project. I have all ...
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4 answers
142 views

Problem with solid state relay and ac motor

I installed a circuit to automatically start a dust extractor when I turn on one of my woodworking machines. I have one 230V circuit dedicated to powering the machines and another circuit powering the ...
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Need help in base voltage of N Mosfet in CNC AIr Spray circuit

I'm changing my CNC air spraying circuit. I'm simulating this circuit in Falstad, but I'm not getting what I want... Didn't actually assembled it in real life yet this way. What I need is: When the ...
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Solid state relay controlling LED lights keeps failing

I have some outdoor lights controlled by 2 PIR sensors at the top and bottom of the driveway. They are 24V lights and will pull up to 10A in total. I initially had some trouble with the PIR sensors ...
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Toggle light bulb using relay or traditional switch button in parallel

I'm working on my school project. I want to control a light bulb using SSR relay (and nodemcu), but I also want to give user the option to toggle the light bulb using the traditional switch button ...
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Doubts regarding relays

I post this question asking for advice. I am working on a personal project for my garden and I want to automatize a water supply system, more specifically a 1/2 HP water pump and a motor. Both work ...
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Solid State Relay - No output

I've purchased some Crydom AS0241 solid state relays (https://www.mouser.com/datasheet/2/657/aso-series-ac-pcb-mount-1370668.pdf) Their internals: From what I've read I should be able to apply a ...
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DPDT (110V) with memory

I have one switch that should control two power lines (A and B) with lamps. ...
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2 votes
2 answers
161 views

Modding popcorn popper: shut off heater while keeping fan on

So, I'm trying the age-old tactic of roasting coffee with a popcorn popper, and while it works, I would like to have better control over the heat applied in order to prolong the roasting. I've seen ...
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Connecting load to SSR - Doubts regarding load position

I am using a solid state relay to control supply to a load. I would like to provide ground to the load all the time. When the SSR is turned ON (8.4 V will become available to the load). In the ...
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1 answer
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Can I use a SSR to switch on/off an electronic ballast?

It's not appropiate to use a SSR to switch on/off magnetic ballast (used with HID lamps), because it's an inductive load and the Triac inside the SSR cut off while there is still current flowing. That ...
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Replace SSR10DD with SSR25DA

I have a machine with damaged Solid State Relay (SSR) designed to work with DC, there is not available a replacement and what we have is another SSR but for AC. Both of them of course are controlled ...
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Triac SRR causes conducted emission noise with active heater connected to 120V AC

I have a device that controls a silicone rubber heater, which is an active load and whose resistance does not change a lot when heating. 250W heater for 110V has about 50 Ohm cold resistance, which is ...
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Piezo driver IC or 0-5V to 0-300V translator IC

I am new to electrical engineering applications so please excuse any lack of correct language. I am looking for a 4 pin (2 on each side) or 8 pin 2 channel IC that translates a voltage difference on ...
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4 votes
2 answers
508 views

Can I switch 85V / 3kHz AC using this solid state relay?

I got this part, and I am wondering if I could use it to use it to switch ~85V @ 3000Hz. It's not working though, and the label on the chip says 50 Hz. Is frequency the reason it's not working? I have ...
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1 vote
2 answers
85 views

Multiplex Controllino (Arduino) 0-10V input using SSRs

I have to read six 0 - 10 V analog signals but I only have one 0 - 10 V input on the Controllino. I figure I could use six solid state relays and multiplex the signals. When a relay is on it'll allow ...
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SSR with AC valve doesn't turn off

I don't have much experience with solid state relays. I am going to describe my problem. I have a SMC AC valve that I want to control with a Crydom SSR and an Arduino UNO. When I send the signal to ...
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Solid state relay

How to connect a solid-state relay to an output MOSFET, which has 2 drain pins without the ground which I am refering to the image in the attachment? https://www.mouser.de/ProductDetail/Toshiba/...
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What are the benefits of a solenoid over a relay in an electric cart?

I was looking over the wiring diagram of a Electric Golf Cart and noticed the use of a solenoid. The initial literature I found suggest that the solenoid is only engaged when the key is in the engaged ...
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1 vote
1 answer
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How can I replace this simple switch, with an automated alternative?

I have a circuit that I'm changing that pulses current (maximum 1A) through an inductive load (a coil). A second coil is then used to detect the pulse transmitted from the first coil (a 2 coil metal ...
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Understanding the working of relay

I have to design a circuit where a momentary switch is used to control the main power of board. Since its a momentary switch I have a requirement of latching relay. Using only one switch I have ...
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1 vote
2 answers
75 views

How to select a relay for main power input

I will be using momentary switch to control the main power input in my design. Hence to latch the power I need to select a relay. On what basis should I select a relay since I find different types of ...
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1 vote
1 answer
49 views

Solid State Relay Heat Release

I want to use a SSR (AD-SSR6T25-DC-280A) to switch on and off a 24 VAC water solenoid valve. The solenoid has an in-rush current of .9A, with a 400mA holding current. I want to mount the SSR in an ...
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