Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

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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Why does an opto-isolated SSR specify a maximum number of cycles per second?

The AQZ262 can switch on and off in less than 10ms. It is specified as 60 AC/DC at 6A. Yet it has a specification of 0.5cps maximimum. Why?
Dirk Bruere
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Is it safe to control a solid state relay from the MCU output?

I have a +/-30V and +5V signal. I would like to rout this two signal by using the CPC1106N and CPC1006N solid state relay. According to the Absolute Maximum Ratings of the Input Control Current 50mA, but according the characteristic the Input…
Mokus
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Electromechanical Relay for VAC switching

I'm looking at PID devices for coffee machines. There's a tendency to use SSRs (for the regular reasons) but at the current levels (12 amps 120VAC) required these tend to be large (60mm longest dimension). Even with my own SSRs using opto-isolators…
headingwest
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Zero-Crossing AC SSR not working for LED lightbulb

I have a microcontroller driving a solid-state relay to switch an LED lightbulb (the household type). EDIT: added circuit (maybe it addresses Andy aka's comment?). PB0 is the bit 0 of output port B of the microcontroller (AVR tiny25) simulate this…
Cal-linux
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Do higher rated SSRs produce less heat

I would like to switch a 10A AC load with a solid state relay (SSR) and I am wondering if a higher current SSR (e.g. 40A) would be more efficient and produce less heat than a lower current rated SSR (e.g. 25A). Is the SSR's loss resistive (like a…
Michael
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Should I have to include photocoupler in SSR application circuit?

I'm designing simple circuit for ssr control. I reviewed some sort of related circuits and previous version of the product(our company's) Many of them are including photocoupler before S.S.R. control pin not in the diagram of S.S.R. I thought S.S.R…
Aveugles
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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 there is no path the multimeter can find between…
SavageHenry11
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Is a SSR designed for AC power fundamentally different from one for DC power

A solid state relay can switch between high and low resistance with no moving parts. The control signal is a small (~10V) DC voltage. By this logic, I assumed that a SSR can switch either AC or DC power interchangeably. I bought a PID temperature…
BobTheAverage
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Is it OK to run a signal junction at a "do not use" pin on a solid state relay DIP package?

I am attempting to retrofit an LCA710 solid state relay into an exiting PCB that has a mechanical relay. I will need to cut some traces and run some fly wires, but there is one IO line that would "pass across" pin 3, marked "do not use". Would this…
TDL
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Using a solid state relay/ photoMOS relay

I'm trying to use solid state relay (Panasonic's AQY277 / AQV215) to switch a light bulb (100 V AC). To control the input, I'm using a signal generator in DC mode with 5 V as input. I have not yet succeeded in making it work. Anyone having any idea…
user16119
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Relay VS Push Button: blind test (how to tell the difference)

I have a classic push button that closes the circuit when pressed down. This push button was replaced by a simple relay, the relay is activated when 3V goes through its trigger points, and the circuit is closed. The result is the same, the circuit…
Laura
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Solid State Relay not working, am I mis-reading the data sheet?

I purchased several IXYS CPC1017NTR SS relays from Mouser. I have 1.2v and .5mA of current running over the control input of this relay and the load side isn't connecting. Here's a diagram of what I'm trying to do roughly (I missed connecting the…
Matt McElroy
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Solid State Relay "fading" instead of dropping secondary voltage

I am using a (rather cheap-ish) chinese solid state relay (ssr) with 5V DC on the driving, 230V AV on the driven side (there's an ATtiny85 randomly letting devices run for 10-30 minutes, then cuts the power for 10 seconds, then all over again for…
Christian
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Using Solid State Relay board for wired low-voltage switch activates AC outlets

pardon the noob question (though I have a EE degree back in the day, it's been a long time). Let me ask this simply, then explain my use case below. I am wanting to use several existing CAT5 cables with a simple manual switch on them to activate…
noisedoctor
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Replace thermostat with rasberry pi and Solid state relay

I want to replace my thermostat with raspberry pi board. I have already connected solid state relay to rasberry pi and it works just fine. The only part left to do is to connect solid state relay to the thermostat. I have an idea how to do that but…
user1704730
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