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 ...

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18 views

What happens if my SSR output voltage is rated higher than than my expected throughput?

I have a solid state relay (pictured below) rated at 24-140 VAC output, and I'd like to use it for digitally controlling a 12 VAC circuit. Will I be able to use this device? In the case that I ...
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0answers
37 views

What is the shortest delay time achievable by Solid State relay

I am doing a project using Arduino Uno R3 to switch 220-250V A/C at about 13A current(as per load requirement). The problem is that I am able to drive the required control voltage of the SSR but I am ...
0
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1answer
58 views

SSR not switching dimmed load

I have a system where there is a "master dimmer" (an 800W dimmer designed for household lighting). From that master dimmer, I have a few SSRs switching 40W incandescent light bulbs. The idea being ...
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0answers
29 views

DC output Solid State Relay troubleshooting

Recently I purchased a solid state relay for use in a project I'm working on. Having never used an SSR before, when I got it I set up a quick test circuit to make sure it was working and I understood ...
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2answers
33 views

How to be sure a SSR has not been damaged when its circuit breaker has tripped?

I've got a Crydom CKRD2420 SSR wired in series with a ABB S201-C6 circuit breaker, supplying power to a 1kW 240VAC heater. This is one of several identical lines, which are all supplied via a ABB ...
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2answers
63 views

Avoid EMI in power circuit controled by MCUs

This is a toy project just for fun. As anybody knows, if I want to control a lamp by a simple switch, the circuit is as follows: However, I want to change the circuit so I can control a lamp with ...
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1answer
84 views

Which Switches Faster? Transistor, Solid-State Relay or Relay

Which Switching Device can Switch from Off to On and Off the fastest? Transistor Solid State Relay or Mechanical Relay
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2answers
38 views

Switching 15V, 1.5A AC with SSR

I need to switch 15V, 1.5A AC into a resistive load with a 5V control signal. Will this SSR work? http://cpc.farnell.com/crydom/aso242/ssr-2a/dp/SW03811 To be specific, I do not understand the term ...
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2answers
57 views

What is the intended use of high current SSRs and triacs?

I answered a question recently regarding power dissipation in solid state relays. This is the calculation: Consider this 40 A rated triac - BTA40. Vto = Threshold voltage = 0.85V = Voltage drop ...
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3answers
141 views

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 ...
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1answer
71 views

How to reduce the leakage current of a solid state relay?

I have a zero-cross solid state relay (Crydom CKRD2420) that regulates the power output of a 2kW@240V heater using 10Hz PWM (e.g. here to illustrate). I need the power output of the heater to be under ...
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3answers
84 views

AC SSR does not switch off - why?

I have a circuit meant to manage a shutter (or a shutter motor to be more precise). The motor has two power lines - depending on which power line one connects power, it moves up or down. I designed ...
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1answer
51 views

Using a LCA110 DIP-6 Solid State Relay to switch 330v DC

Would a LCA110 DIP-6 solid state relay work for switching 330v DC? I cannot find information on the datasheet of whether or not this is suitable for switching 330 volts DC. I am using it to switch 5 ...
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1answer
49 views

What to use to switch AC power supply using 5v micro controller? [closed]

Here is my question and situation in more details. I am working on a college project where I need to switch on/off AC appliances using 5v Micro Controller. Appliances can be fan, motor, Fridge, Air ...
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2answers
80 views

Driving a Sainsmart Relay using Raspberry Pi

I am actually a software engineer and not really familiar with wiring. I've been playing around with a Raspberry Pi Model B, and am looking to hook up a 2 PRONG Extension Cable to a Sainsmart 8 ...
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0answers
38 views

SSR - current leaking

I'm building a controller to regulate a heating element. I have a PID attached to an SSR that is giving me problems. When I apply AC power and load to the power side - I measure significant leakage ...
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1answer
94 views

Suggestions needed to replace relay on this circuit

I am designing this circuit for testing purpose to test the following conditions. 1.When +12V is applied to the test circuit,my Circuit B should be activated for 2ms and trip open.CKT B is already ...
1
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1answer
42 views

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 ...
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41 views

480 VDC Series Battery Bank - Intelligent Discharge Control Circuit

I have a Lead Acid Battery Bank (40 x 12 VDC 50AH Batteries in Series) that services a small variable DC load of lighting and small heating elements. I want to protect the battery bank from being deep ...
2
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1answer
114 views

What type of relay should i use to control a water pump (with a raspberry pi)?

I've got a straightforward question: I'm wanting to control a pump (120V AC) with my Pi. I tried using a Cyrdom SSR (info) but I now realize it is for resistive loads only. Is there a relay rated ...
1
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1answer
98 views

Fast switching (microsecond to nanosecond) voltage using 10V signal pulse

I have an application where i need to be able to switch from a 20V supply to a 40-50V (variable) supply in a very small amount of time. Ideally this changeover needs to be prompted with a signal pulse ...
1
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1answer
68 views

Automotive or solid state relay as main switch for 3D printer?

I have 47A 12V server power supply for my 3D printer project. The idea is to add a relay before printer hardware (RAMPS, Arduino Mega clone, steppers, bed heater etc). The normally open relay is then ...
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0answers
26 views

PhotoMOS simulation circuit

I want to simulate the following PhotoMos in CircuitLab for switching circuit but i didn't find the model for any photomos in CircuitLab. I was preparing a simulation for a switching MOSFET circuit ...
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0answers
131 views

Arduino driven triac circuit (SSR)

I found a nice circuit for my Arduino project, I wish to control AC based tools and machines up to 6A. The circuit had some issues but it was discussed and fixed on this link: Triac driven dimmer ...
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2answers
126 views

Making dpdt relays from 2 spdt relays. Possibility of short circuit?

I am designing a changeover circuit that switches the load from one grid station to another. I was thinking about wiring two spdt relays in anti-parallel to create a dpdt switch. The schematic at the ...
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2answers
106 views

Working with Inductive Loads

I have a 2 ton split AC that would draw about 12A current and is rated for 2260W input power at 230V. With this much information how do I choose a solid state relay? Since the Rating is in inductive ...
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2answers
75 views

Wiring an SSR rasberry pi with an SSR-10DA

I have an SSR (pictured) that I intend to wire up to a European 220v appliance (in Norway) and a Rasberry Pi. It appears from this post that no diode is necessary (with an optional 1k resistor). So ...
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1answer
66 views

Electromechanical or Semiconductor solutions to control chandeliers and homes stuff

I've been designing some wireless modules and finally got them to work and now I have a network of them and want to use them for home automation purposes. Controlling stuff like chandeliers, heating, ...
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1answer
87 views

Solid state relay not turning on motor as expected

I have a very simple control system for two homebrew pumps using a 12VDC control circuit and two (2) solid state relays (https://www.sparkfun.com/products/13015). Specs on the pumps can be found here, ...
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1answer
114 views

Connecting Solid State Relays To AC Heating Elements - Is this circuit correct?

I'm converting a 1500W toaster to a reflow oven with PID control, but I'd like to focus on the hardware aspect. I've pulled the switches and controls out of the oven and I'm left with something like ...
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0answers
60 views

Solid State Relay seems to have failed with short observed between output terminal

I had designed an SSR based AC motor controller a few months back and not really used it till a few days ago. I had tested the circuit when I first had it fabricated and it worked fine. When I tested ...
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1answer
97 views

Solenoid valves in series or parallel?

I already have the main solution and dosing solution tanks hooked up to each other, with solenoid valve S1 controlled by the liquid level switch through the DC power supply and DC/AC SSR (see image), ...
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2answers
178 views

When/where to open and close a transformers output

I came across Beware of Zero-Crossover Switching of Transformers (TE Connectivity App Note) where they discuss about how you shouldn't switch a transformer at the zero crossing because it would have ...
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0answers
57 views

Connecting/disconnecting AC signal via uC

I want to mix up to four AC signals, that may or may not be DC biased, but will always be between -5.6 and +5.6. For that I was going to use a summing amp. (If anyone wants to talk me out of that in ...
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1answer
118 views

Relay Solution for Controlling Pumps with Arduino

I'm working on a hydroponics project that requires me to run 10 pumps for 15 seconds every 2 minutes. I was able to set this system up by running a relay board off of an Arduino, but the relays were ...
4
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6answers
398 views

Parameters when choosing a relay

Is this a good circuit to use as a air condition switch with a help of microcontrollers 5V? What relay to use in this situation? What parameters should I take into consideration when choosing ...
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3answers
100 views

Solid State Relay operation

A solid state relay specifies a trigger current of "7.5mA/12V". How much current does it draw at 5V? This is the relay. I'm controlling it with an Arduino which has a maximum current draw of 40 mA ...
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1answer
129 views

How can I switch two wires using solid state relays?

I want to add a "reverse" function to a brushless motor ESC - in theory, it can be done by simply switching any two of the three output wires - I would like do to it via solid state relays, but I am ...
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votes
1answer
48 views

Will a 3-32 VDC input signal relay be damaged (or will work) with a 110 VAC input?

I'm looking at getting a SSR-25DA relay (http://www.amazon.com/gp/product/B0087ZTN08/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A1THAZDOWP300U) and using it with a temperature controller that ...
1
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1answer
34 views

SSR selection - how is on resistance related to output IV curve?

I am looking at the datasheet at the link below, and I can't for the life of me figure out what I am missing. http://www.digikey.ca/product-detail/en/TLP3542(F)/TLP3542F-ND/871299 This is a Toshiba ...
2
votes
1answer
92 views

Solid State Relay Input Resistor

I have a set of solid state contactors that I want to turn on and off with 24v PLC outputs. That contactor takes 4.5 - 15V inputs ( Changing the relay to the 24v input model is not an option right ...
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2answers
143 views

Why does my solid state relay not properly power a DC load?

I'm using a T108S02 to try to use a logical signal to turn on or off a small 3V DC toy. I'm not sure of the load current of the toy since my ammeter is not working. When I activate the relay, my toy ...
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0answers
50 views

ULN2003 similar circuit for 120VAC device

I am looking for an integrated circuit which maybe similar to a ULN2003 in the sense of being able to control multiple high power devices. I want to control 8 120VAC solenoid valves with an arduino ...
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3answers
150 views

Solid state relay doesn't turn off

I am trying to build a custom light setup for my computer desk. I want to use the scroll lock LED signal to control a pair of 12 volt DC CCFL lights run off the same inverter. The problem is when I ...
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5answers
687 views

Creating DPDT Solid State Relay with FETs

I feel like this should be a very simple question but so far I have not found a solution. My goal is to make the following DPDT relay circuit using MOSFETs: The goal is to connect INX to OUTX or ...
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1answer
86 views

Switch high frequency AC on/off at zero crossing

I have a 3 phase generator which is powering some system. (50Vrms @3A, with variable frequency from 50-5KHz). I've used mechanical relays to control each phase to the load. However, there was no real ...
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1answer
201 views

Using a Normally Closed PCB mounted Solid State Relay

Summary: Continuing my search for a solution to my problem, I have landed on normally closed solid state relays (NC 1 FORM B SSR). Could you tell me if I'm doing this right? What I need: What I need, ...
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0answers
107 views

Calculating signal attenuation for AC?

So we've got this; simulate this circuit – Schematic created using CircuitLab Which I've been told is equivalent to the sum of it's Coutputs to an AC signal; simulate this circuit ...
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0answers
63 views

Changing the resonant frequency on the fly?

So I have a coil and a default capacitor, they resonate at 150kHz. I have these three SSRs in place, they "add" a capacitor into the circuit. Here's a simplification of one switch; simulate ...
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0answers
61 views

Please help me with my capacitance-adding circuit

It's to add capacitance to a little tesla coil, (Bigger schematic, right click > open in new tab to view full size) Please note, I removed the capacitor and resistor on the gates. For some reason ...