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Questions tagged [relay]

A relay is an electrically controlled switch. Electromechanical relays use an electromagnet to activate mechanical contacts, solid-state relays use semiconductor switches.

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how likely is a relay failure?

have a SxS refrigerator with a relay that starts the compressor. The relay is activating too often, every minute or so. I'm not entirely sure how the whole circuit works but there is a capacitor ...
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52 views

How to get a 24 V signal generated when the input circuit state changes?

So I'm an IT guy with no electrical experience trying to figure this out. How do I set up a circuit that puts out a 24 V signal for a short time or puts out a continuous 24v signal that quickly turns ...
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27 views

RC snubber values estimation [duplicate]

To control my windows roller shutters I have made small circuit with relays and connected parallel with physical switches, but relays quickly stopped working, because they got stuck. I have read that ...
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2answers
77 views

Software controlled variable voltage AC supply with SSR relays

I have an autotransformer like this one : I would like to control it with an arduino solid state relay like this one: What would happens if I wire every output of the transformer together to the ...
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1answer
32 views

Choosing correct relay for LED power supply rating

I have a 500W 24V power supply for running 24V LED strips. The power supply says it's rated for ~21 amps (500W / 24V). Assume input is US 120V household power. I want to control the 120V supply ...
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2answers
51 views

relay life time

I am developing a home automation system using nodemcu esp8266. For this I want to use srd-03vdc-sl-c relay to control my appliances with nodemcu. But I am not sure that how long this system will work ...
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Votalge rate- External power for a Relay component ( Arduino code / ESP8266 ) [on hold]

I use a dual relay component bought from AliExpress in an Arduino project, which runs on an ESP8266. Relay is powered and operated using a 3.3V, from ESP port. This relay module can be external ...
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1answer
30 views

Protecting servo drive outputs from inductive loads.

Can anyone please help with the following. I am in the process of connecting a Schneider Electric Servo Drive for a Cnc project. I want to wire a fault output from one of the 5 drive outputs. (Do1-...
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Safety start-up and quick power down switches for machines

I am tasked to design start-up system for sawing machine which requires two hands simultaneously to press two push buttons placed 75cm apart. To power down the machine either one of those buttons can ...
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47 views

Best way to protect a relay? [on hold]

I am thinking about putting a relay on my bike to create a parallel circuit in order to install heated grips and a 2A USB plug. I got 2 of these relays (V23154-CO722-XO77, datasheet here) but I am ...
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3answers
72 views

How to control two separate circuits with one switch? [duplicate]

I have two separate circuits with different types of diodes. One circuit draws 3,5V and the other draws 9V. How can I wire this up so that one switch can turn both circuits on or off? As far as I ...
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4answers
84 views

Do I need a relay for my LED bars?

I installed two 4" 18 watt LED light bars on my ATV. It is currently wired to the factory switch on the ATV handlebars and there is no relay being used. I have had to replace the right LED bar twice ...
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56 views

A simple circuit to turn on door LED when someone visit me

I want a simple circuit do an alarm light that tell me someone visited me. When someone visits me and in the case no one answer the door, I want to know that. So I want a press button switch outside ...
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27 views

How to connect the Peltier module to TEC W1209?

I am trying to control my Peltier module using the W1209 TEC. I set the P0 to H, so that it should provide voltage to my Peltier module until the temperature reaches the set temp. The LED turns on ...
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35 views

Why are contactor coils connected to two different safety relay outputs?

When looking through a manual for a safety relay, I began to wonder why the coils of the load contactors (K3 and K4 on pages 14-15) are always connected to two different NO contacts of the safety ...
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68 views

How can relays be rated at 10A for both 240VAC and 120VAC?

I have a small W1209 DC12V thermostat PCB that's had a small 12VDC relay attached. The print on the relay says that it can do 5A @ 240VAC and 10A at 120VAC. That makes sense, as both of those equal ...
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25 views

Switching relay with an Arduino (SSR) for Xmas lights

I am trying to operate a 4 relay board with an Arduino Uno, code is correct (tried two boards) LEDs light on the SSR board and run at the correct rate i.e. 10sec on/off. I just cannot get the relays ...
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28 views

Relay Voltage Rating Question

I'm just confused about relays. For example, say for something like this https://uk.rs-online.com/web/p/latching-relays/0515571/ It says coil voltage is rated for 12VDC and switching current of 5A. ...
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37 views

Calculating the off impedance of a relay output by a multimeter

I'm trying to calculate the output OFF impedance i.e. the impedance caused by its RC snubber of this SSR. So I perform the following test: Zc is the relay's OFF impedance and Zv is the fluke 114 ...
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1answer
43 views

Issues with designing ground plane for switching relays in high noise environment

I am designing a PC Controlled 8 channel Relay using AVR microcontroller. Here, the relays are on the right side of the board and are controlled by the AVR micro on the left side. The eight TTL ...
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1answer
78 views

Can I solve this relay output issue by using a resistor?

For an enclosure, I will control the power at the terminals of a panel mount AC socket by using an SSR. The AC mains socket will have this indicator lamp in parallel to indicate whether the socket is ...
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Inductive spikes and noise in a hand prosthesis circuit

I am designing a circuit for a hand prosthesis. The main part of it is as follows (connections via pcb): Since it is meant to be as robust as possible, while keeping it low-cost and affordable (thus ...
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24 views

Relay Contact noise Filtering

I am trying to filter relay contact noise when the relay contact goes from normally open to closed. The relay part# 833H-1C-C-12VDC.The relay contacts are made out of Silver Tin Oxide AgSnO2 I am ...
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2answers
73 views

Use of relay in a gas sensor (safety issue)

I have developed an MQ-5 based LPG gas sensor which uses a relay. Is the relay itself a fire hazard (while switching) if gas is in the vicinity ? Thanks.
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1answer
22 views

Circuit to a/b switch like a relay would. So an analog or digital signal can be turned on or off or routed

I need to build an arduino-based switcher / router for a multi-arcade to route controls to different game boards, and also switch 2 vga inputs into one output. Without introducing any lag also. 3 ...
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1answer
32 views

220 VAC parts controlled via 12 VDC pump

I have two water elements using 220 VAC, the water to them is supplied by a 12 VDC pump, I am needing to control the 220 VAC to the elements in case the pump quits, is there a way to shut off the 220 ...
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2answers
66 views

Relay Voltage and Current

I am using a 5V relay for switching ON/OFF a starter motor. The motor draws 12V/16A to run. The relay has the specification as shown below. My question is will this relay work or it will burn due to ...
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23 views

Controlling a Relay with noisy automotive power supply

I want to implement a 12V relay (https://www.mouser.com/ProductDetail/Panasonic-Industrial-Devices/TX2SA-12V?qs=HLLy2pIPwuuBcCVwky7PWw%3D%3D) in an automotive application. I will be using the car's ...
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3answers
102 views

What relay do I need

Hello friendly friends. In my wood shop I have two separate 220V circuits, A and B. B is new and I want to use it to drive the dust collection (1800W). Now I want it so that when I power on one of ...
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1answer
48 views

Outdoor proximity sensor, triggering siren, powered by solar

My dog keeps jumping into our flower boxes and digging in them, destroying what we're trying to grow. After trying different things, my conclusion is that I need to scare her every time she jumps in ...
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2answers
48 views

Confusion with interfacing a relay according to its given datasheet?

I'm confused about interpreting a datasheet to interface a relay. In my application, a solenoid-valve is going to be turned on every 30 minutes to drainage water periodically. The control signal will ...
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38 views

Relay 5v Raspberry turned off after few seconds

I connected a raspberry to a relay. This is the relay I used: This is the final scheme (but I used Raspberry Pi Zero w): Then I write a very simple python script as below: ...
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70 views

Swap between two colors without an additional light?

A Quick Note I'm not sure of a more accurate name for this question. If you can think of a better name, feel free to edit and change the name. Also, I'm not the greatest with technical terminology so ...
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1answer
44 views

Flux protection vs. sealed relay enclosures

When reading the datasheet for the Omron G5Q series relays, there are two options for enclosures: flux protection and sealed. The price difference is almost a factor of two, with the former being the ...
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14 views

Schneider Micom P123 trigger Output Relay

I am testing a Micom P123 relay with IEC103 protocol. I was able to communicate with 3rd party free Protocol Analyzer, Vinci. I was able to get Digital Input status. So communications is working good. ...
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1answer
49 views

Using relay contacts in series to switch DC loads

We are using relay DRM570110LT and We need to switch 3A @220VDC in the output when we have a DC load. As the datasheet for this relay says, the rated switching current is 5 A, but I've been told this ...
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27 views

Control LED panels via a relay and a PIR sensor

I bought 6 x 48W LED panels and a PIR motion sensor to light a shed/workshop area. All 240V rated. I did not appreciate that the LED drivers have a high inrush current. My question is whether I can ...
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1answer
66 views

car Ignition switch relay maintain closed after remove power

I have a car ignition switch that has 4 settings and is +12v DC: 0=off (no voltage) 1=accessory (only some items have power) (no voltage will go to pump) 2=on (all items have power) 3=start (...
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1answer
64 views

Normally On Circuit with Positive Trigger?

Pardon my lack of technical terms here; essentially I have an under glow kit on my car (along with some other lighting) that I want to expand the circuit on. I bought a pair of 5 pin relays to ...
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1answer
53 views

Transistor Reverse Biasing - AC

I am working on a project which require to activate a 24V Rated relay using a 3.3V rated IO. To provide adequate isolation I have added a Opto-isolater stage. In order to increase the current output ...
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7answers
4k views

Relays vs. thyristors: What is best for swiching 230 V lights on and off rapidly (~ 5 Hz)?

I am building my own disco/party lights. 230 V/60 W bulbs, and ideally I would like to switch them on and off at 5 Hz. I was planning on a simple setup with an Arduino controlling the lights. My ...
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1answer
21 views

Relay if powered with ac supply then turns adjacent circuit on automatically

I took the idea from the below link to build my own relay board. http://www.electronics-lab.com/project/toggle-on-off-switch/ I connected 3 of this in parallel with voltage. All seems well until I ...
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1answer
26 views

Running Relay in parallel to switched neutral rocker switch

Complete beginner here, so apologize if this is obvious - but I'm trying to hook up a fog machine to a relay module for my Arduino. The Fog machine has a plug for the wall, then a second drop cord ...
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0answers
10 views

Electric Garage heater problems [migrated]

I own a Fahrenheat FUH724 (7500 watts) electric heater for my 2 car, uninsulated garage. I installed this unit 12/2017 along with a Nest thermostat. An Aube rc840t-240 relay was used to step down the ...
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20 views

How to drive a 6v relay using 74ls08 output? [duplicate]

Im using a 74ls08 and gate ic, and I cant drive a 6v relay by using the output of the 74ls08. In what way can I drive the relay?
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2answers
41 views

Coil resistance for relays

I have a refrigerator that stopped working. A few years ago the board was burnt near a relay contact therefore I looked at the board as the primary culprit. I am trying to test the relays to determine ...
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27 views

AC 220V testing with relay and Raspberry Pi

I am trying to determine whether the 220V wire is live. For this I am using a mobile adapter which can give me 5V digital output (at AC 220V) and giving 5V as a signal to relay. On the output side of ...
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1answer
40 views

Open and Close Circuit automatically (Automate Push Button)

I have a simple circuit board with a push button on it. I just want to automate the pressing action every 0.2 sec or so. The push button has two terminals underneath and I understand that I should ...
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2answers
61 views

What relay to use?

There is a behaviour that is needed to be achieved with a circuit, that I believe can be done with a relay. However, OIcan't see to get it right.. The scenario is the following: The relay will ...
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1answer
75 views

Overvoltage protection for AC relay dilemma

I am currently designing a safety-related device that has to open a relay when a certain event occurs. During most of its life, this relay will be closed, and only open if the safety event occurs, ...