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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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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28 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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43 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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27 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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31 views

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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77 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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49 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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39 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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40 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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29 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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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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22 views

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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50 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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33 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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160 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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1answer
53 views

solid state relay unexpected behavior

I've wired a teledyne s24d40 ssr to a leviton 20 amp duplex outlet using a 12 gauge extension cord. The load is a 1200 watt ...
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1answer
43 views

Correct way to add LED in front of SSR?

Looking at at adding a simple LED indicator in front of an solid state relay. Not sure if its more correct to put it in series or use two different resistors as shown in the example. The indicator LED ...
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49 views

Solid State Relay Input Current

The keying circuit buffer I was using failed while using my Ham radio. The radio outputs 12VDC 10mA max. current. When the external keying circuit transistor failed, the RF board in the radio where ...
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796 views

How to control the output voltage of a solid state relay

Considering this solid state relay: The output voltage can be from 24 to 380V. How can I control this voltage? Is it proportional to the input voltage? What I need is a voltage regulator that can be ...
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1answer
35 views

is it necessary add snubber network for a SSR made by mosfets?

I am designing a control circuit for AC/DC loads. To achieve this, I am using a SSR made by mosfets https://datasheet.lcsc.com/szlcsc/Vishay-Intertech-LH1546AEF_C142599.pdf However this is not a ...
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98 views

Choosing a Solid State Relay for an AC air compressor application

I just started working with/reading about solid state relays last week, so bear with me here. I have an air compressor -- 120 V | 60 Hz | 2.8 A -- that I would like to operate with a control signal ...
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140 views

RC Snubber for Air Conditioner SSR

I have a window/Wall AC 2 Ton (240V X 15A = 3600W) I'm trying to control it via SSR to use Central AC thermostat board on it which is working good on fan level and all but I need a relay to switch the ...
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140 views

Designing an analog high voltage multiplexer

I'm putting together a design for a vacuum tube tester and curve tracer. The circuit I want to build is capable of powering up a tube and measure the voltage and current at the tube's pins. I would ...
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1answer
126 views

How to switch 220 VAC? (Magnetic relay, SSR relay or triac)? [closed]

I want to switch 220V AC with a microcontroller. Before I used magnetic relays or SSR relays, but now I want to use a triac for this function (like in this circuit) and my load can be any 220 V AC ...
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33 views

Solid State relay and Limit switch

I'm building my first CNC machine, it's a 40W Laser Cutter. I'm planning on adding a security feature that cuts the laser power supply if the enclosure door is open during while operating. I want to ...
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1answer
62 views

Switch LED with Solid state relay (PhotoMOS)

The SSR is a PhotoMOS AQY211EHAX rated to drive 1 amp. I seem to be shorting the output side of the SSR. Is a pull down resistor normally required on the output side or am I missing something ...
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204 views

Why does this Mosfet get Hot?

I have an IRF740 mosfet that doesn't get hot in one circuit but then gets completely hot in another identical circuit and for the life of me can not figure out why. Well the circuits aren't exactly ...
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2answers
59 views

Using a step by step relay along with a solid state relay

I have a step by step relay which is connected to a light bulb and to a manual switch. In parallel with the manual switch I put a SSR. I command the SSR to be on for 0.5 seconds, however the light ...
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66 views

Help with wiring a temperature controller and a solid state relay

I have a problem that's probably patently obvious to someone in the know but alas, that's not me. Long and short- I have a 240v heating table (aluminum table with silicone heating pads underneath) ...
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110 views

MOSFET relay as an alternative for TRIAC relay

I use a 2 A TRIAC relay with non zero crossing from sharp in one application. Unfortunately I couldn't find this type of relay, and I want to use another relay (MOSFET relay 2A from TWOARD). Theses ...
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171 views

Two state switch using transistor (bi-directional)

I have an existing pair of wires driving a servo motor. One of them is +12V, the other one 0V. Depending on the rotation direction of the motor, the voltage flips. I now want to put an optional ...
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182 views

How to measure ON Resistance of a Solid state relay?

I am new to use Solid state relays (SSR). For my application i am using Panasonic 'AQV252G3' relay. i want to measure ON Resistance of this relay, according to the datasheet it ranges between 0.033 ...
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67 views

Questions about an on-off control comparator circuit driving an SSR

I was doing on-off temperature control for around 40‎°C for an enclosed unit manually by switching on and off a 1100W heater(with a fan) with my hand. The accuracy is not very important roughly 40‎°C ...
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36 views

TRIAC based SSR output wiring COMPARISON

I want to use a triac based SSR (AQH-3213), I checked the datasheet wiring diagram, and it seemed simple. The problem is that its construction is the same as the triac driver optocoupler (MOC3041), ...
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93 views

Solid State Relay is giving off voltage even when turned off

I'm currently creating a circuit according to this schematics i made. I have removed some irrelevant parts for simplification sake. The SSR in question is a 861SSR210-DC-1. When 5v is applied between ...
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1answer
24 views

Esp8226 with opto mosfet switch LBA110

I want to switch AC load by LBA110 because it has NC switch pole and tiny side. I tried to read datasheet, but with my bad knowledge about electric, I can not find out how to make it work. Is it work ...
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72 views

How to improve flash time on lights controlled by solid-state relay via Arduino?

My goal is to flash lights around the house on and off to the beat of a song. When doing this with a mini LED and an arduino, it works perfectly with a "flash_time" of ~.1 seconds. This means ...
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96 views

Why SSRs for heaters?

In the context of building PID controllers for very large heater systems (ovens, kilns, etc.) nearly all the designs I encounter use an SSR to switch the load, a choice I don't understand. The power ...
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1answer
36 views

Can AC voltage phase change across an SSR?

I got an SSR (Picker PCS15-D-240A-25ZL) to control a single phase 240VAC North American circuit going to a heating element on a homebrew setup. One of the load wires goes through the SSR and the other ...
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2answers
72 views

Solid state relay Crydom D1D07 closes and remains closed

I have a Crydom D1D07 solid state relay and the control side is a +5 V DC on terminal 3 and a +3.4 V DC (don't ask) on terminal 4. When terminal 4 is switched to ground (from +3.4 V ...
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65 views

Asynchronous single phase Motor do not start

I have got from my company scrap an old Alcatel Vacuum Pump. After taking apart the pump and cleaning everything, I tried to make the motor run. Unfortunately apart a noisy 50 Hz the motor don't turn....
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88 views

Controling a Washing Machine AC Motor Using a Relay

I would like to control the motor of my washing machine using an Arduino. It's an old washing machine with a mechanical controller and an AC motor connected to a 12.5 uF run/start capacitor. According ...
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2answers
551 views

Would it be possible to use a solid state relay as a dimmer switch?

I wanted to make a smart switch with a dimmer using an arduino and a solid state relay. I was wondering if this would be possible and if their would be any problems if I tried to do so. Also, the ...
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163 views

Circuit Board Design…Getting Rid Of A Relay and Adding a Choke and Capacitor Filter?

simulate this circuit – Schematic created using CircuitLab Figure 1. Original Schematic Is there any way to get rid of the relay in this circuit? And would it be wise to add in a power ...
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48 views

Usuing P_channel mosfet to make o normally closed switch

Hi, I am trying to implement a normally closed switch. In the shown circuit: Vcc = 16..60V (Vcc>>Vz) The characteristics of the P-mos are: Vth = -1V Rdson = 0,055ohm The circuit works correctly: in ...
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113 views

Sizing Flyback Diode

I'm working on a project to run a 12 volt 12 amp DC gearmotor via PWM output from a controller. I am using a Crydom solid state relay to power and motor and trying to figure out what diode is correct ...
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58 views

Creepage on SMT DIP package with an NC pin

I'm having trouble understanding how the CPC1972GSTR can have the specs it does. Here's the datasheet. In particular, it has a blocking voltage spec of 800V, but if you look at the recommended ...
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196 views

Sequentially driving multiple stepper motors with 1 driver and 1 controller

I am trying to control multiple stepper motors sequentially (only one at a time) with one controller, one driver a multiplexer and a dedicated "relay" circuit (shown in red). The idea is instead of ...

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