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 ...

learn more… | top users | synonyms (1)

1
vote
3answers
83 views

Protecting Solid State Relays from Short Circuits

I have 4 SSRs on my board with a steady state current rating of 2A and a peak current rating of 9A (Relays are CPC1976). This product is meant to be a commercial one and the relays will be powering ...
0
votes
2answers
55 views

Using triacs to switch more complex equipment than just motors and lights?

Obviously triacs have been well known to be used in applications which don't really require a perfect sine wave to function. However, what about say a triac to switch on and off more complicated ...
0
votes
4answers
53 views

Using an SSR photoelectric sensor with Arduino

I'm wondering if I can use this photoelectric sensor with an Arduino. I don't have much experience with these sensors or with relays, and I'm sometimes confused by output switch ratings, so I can use ...
0
votes
2answers
59 views

Voltage drop problem with my solid state relay

My solid state relay seems to be dropping the potential by 35 volts. I read about 80 volts from one end of a modified plug and the other end is plugged into a 120 volt wall socket. I have the hot ...
1
vote
1answer
40 views

Ensuring an SSR relay is dead

I recently purchased a used IEC Centra centrifuge with a refrigeration feature. Works great, except the refrigeration condenser never cycles off and as a result the chamber gets down to the minimum ...
2
votes
2answers
126 views

Solenoid stays on when output turned off

I have a power supply with 12V running into a the common on my PLC. Output 0 on the PLC is wired into a solenoid. The negative on the solenoid runs into the ground on the power supply completing the ...
1
vote
1answer
71 views

Is it possible to turn an audio signal ON/OFF using a solid state relay?

I'm thinking about controlling an audio signal (turning it ON/OFF) using a solid state relay switch? Is that even possible? If not, is there a different or easier way to do this? I'm a noob in the ...
1
vote
0answers
39 views

Choosing a SSR for CFL (Peak Current Rating)

I have to choose a solid state relay to switch some CFL lamps. The particular lamp is a 85W CFL (this is the actual wattage and not a comparison to Incandescent) which has a turn-on characteristic as ...
0
votes
1answer
38 views

What determines the communication speed? is it the physical link's speed or the communication card speed?

Two IEDs (Intelligent Electronic Device),an electronic relay and a gateway, are connected with Modbus RTU protocol over RS232. In the relay's manual it states that a speed of 9200 bauds can be ...
1
vote
2answers
54 views

Controlling Solenoids using Relay vs Transistor

In several examples, relays were used to control solenoids, others use the transistor. In my question, I'm looking at controlling 24VDC solenoid pneumatic valves. What are the advantages and ...
4
votes
2answers
162 views

Driving a contactor from TTL

I have 7 contactors that need to be controlled remotely (a permanent installation). These are controlled with 240V AC and, according to specs, uses 9.2 VA of power when turning on and 2.7 VA of power ...
0
votes
1answer
129 views

Which transistor should I use in place of a 5V relay to adjust brightness of lights (230V) with the Arduino?

I want to control brightness of lights (230V) with the Arduino, and I know that relays will just switch the lights on/off. If you have the circuit or any idea about which transistor to use and how to ...
0
votes
4answers
124 views

Can this 12VDC Relay be used for Switching 24VDC?

Can the Songle srd-12vdc-sl-c relay be used with 12VDC on its output? On top of the relay, it writes 10A 28VDC.
1
vote
1answer
101 views

Driving a load with 1.8V input

I have a Gumstix expansion board and want to make it communicate with some 24V PLCs. I've read these topics for reference: 1.8V to 5V, still not comfortable with transistors Transistors: why are ...
2
votes
1answer
114 views

How can I control brightness of a CFL with a microcontroller?

I'm new to electronics and just turned on and off appliances with an Arduino and relays. Now I also want to control the brightness of a CFL with an Arduino as I controlled the brightness of a LED. So ...
1
vote
2answers
166 views

How to wire this relay (silkscreen in Chinese!)?

I have the following relay and am unsure of how to wire it since the silkscreen is in Chinese :-/ Datasheet. I'm finding the datasheet difficult to interpret, but from playing around with my ...
0
votes
1answer
122 views

Arduino SSR 5V DC (Mager GJ-3FA-L)

I just noticed this SSR that was for DCV instead of all the others that are normally for AC. Although I can not find the datasheet for it, it does seem compatible with Arduino. eBay auction site ...
1
vote
1answer
72 views

Does low frequency PWM create reactive power in a transformer?

I got a 350VA transformer (230V~/24V~) which is directly connected to a heating unit at it's 24 V ends. The 230V end of the transformer are connected to 230 V~ mains over a solid state relay (SSR). ...
0
votes
2answers
72 views

5v contact closure SSR?

I want to have a contact open/closed when a USB port is powered on or off. When monitoring the USB port with a multimeter it takes >1 minute for the voltage to drop from 5v to zero. What is a simple ...
2
votes
2answers
104 views

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 ...
-3
votes
2answers
116 views

Violation operating temperature

I have a problem on my current project. Relays are failing in Cold temperature. I am using a relay which has an operating temperature +85C to -25C to PCB. And my device under test is at -40C. Can ...
-1
votes
2answers
96 views

Is there such a thing as a wireless solid state relay

I want to control multiple baseboard heaters in my house, but I don't want to put a raspberry pi connected to a solid state relay behind each baseboard heater, or even connect it to the thermostat, as ...
1
vote
2answers
155 views

Amplifying Small Signal With Solid State Relay

I am trying to control an electromagnet with a signal from a small microcontroller (a BeagleBone Black). Obviously, I need to amplify the signal. I have a lead from a power source that I want to pass ...
0
votes
1answer
51 views

SSR function con control panel

I'm new in electronics and would like to build an electric brewery with an electronic control panel. I found on www.instructables.com one control panel and is described as in following image. Could ...
0
votes
3answers
128 views

Can pwm pulse damage High Side Solid State relay IC ,driving Bulbs as load

I am driving a 12V, 10W Bulb and 12V, 5W Bulb (parallel connected) on one channel of high side driver solid state relay IC. For dimming effect, Bulbs are driven by PWM (Intial 3msec) then continuously ...
2
votes
2answers
101 views

Reducing voltage for solid state relay

I have a solid state relay which wants a 1.25-2.5V "activation" input, but my output from the micro controller is 5V. Is it possible to use a zener diode for this? Or do I need a buck converter? I ...
0
votes
1answer
128 views

Convert mechanical relay to solid state relay

I've been searching forums for a while trying to figure out exactly how to do this. I want the same functionality that a mechanical relay does. When the "coils" are de-energized, I want the 'heel' ...
0
votes
0answers
61 views

Minimizing voltage drop across SSR when using it to pull down a TTL digital input on another device?

I have a situation that I've run into a few times. I have a digital output card in my system that uses SSRs. I'm trying to interface to a device (referred to as my DUT from here on) that has TTL ...
2
votes
2answers
173 views

COM port goes down unexpectedly, but Arduino Leonardo keeps running

I am observing strange behavior with my Leonardo board. I use 9V AC/DC adapter to power it. Relay extension board is attached to digital pins, and relays are used to control several valves and ...
-1
votes
1answer
281 views

controlling heating element using microcontroller

I have a 3000 Watt, 240 VAC heating element. (This is the heating element in a commercial espresso machine.) I want to use a micro controller to turn power to machine on and off. it has a pressure ...
1
vote
0answers
367 views

Can You Drive Back-To-Back MOSFETs (aka a Solid State Relay) Without Using An Optocoupler?

I was wondering if there was any way of driving back-to-back MOSFETs (with their sources and gates tied together as shown in the following image) without using an optocoupler? The reason is that ...
0
votes
1answer
205 views

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 ...
1
vote
0answers
62 views

Solid state relay voltage ratings — how to choose?

I am trying to control mains power, which around here is 220VAC @50HZ. Should I be using a SSR that's rated for 24-280VAC (Load), or one that is rated for 48-480VAC? The reason I'm asking is because ...
1
vote
0answers
113 views

Missing phase 3-quadrant TRIAC-based solid state relay for 3-phase engine

First of all, I'm a simple mechatronics technician student first time posting here, so please don't mind if I say something that seems completely stupid, since I consider myself to be a total newbie ...
1
vote
1answer
276 views

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 ...
1
vote
3answers
93 views

Safety relay toggle time

I am currently working with software for a safety relay and during my work I started to think about how much time it takes for a relay to switch. The relay and it's data sheet I am using can be found ...
3
votes
1answer
174 views

How to select gate and gate-source resistors and N-MOSFET for controlling a 5V load from 3.3V input?

I want to control a 5V valve from my BeagleBone Black. As a single GPIO port only has 3.3V with 8mA I cannot use common relays. I found this thread: how to use a 3v output to control a 5v relay ...
1
vote
1answer
192 views

Using Arduino Uno R3 + Ethernet Module, how to control current pass to Lamps?

I have Arduino Uno R3 and Arduino Ethernet Shield V5. What's missing in order to control 6+ lights (bulbs) from my home? Those are connected to 220V AC. My idea is to send a packet via ethernet that ...
1
vote
2answers
325 views

LCA717 SSR connected to Arduino Digital Pin

I am trying to figure out how to go about using this LCA717 SPST-NO relay in my project. I will be sending 12V (car voltage) to a radar detector and I want to be able to turn it on/off whenever via ...
1
vote
2answers
184 views

MOSFET Relay (G3VM-21AR/DR) connected to Arduino Digital Pin

I am trying to figure out how to go about using this Omron MOSFET relay in my project. I will be sending 12V (car voltage) to a radar detector and I want to be able to turn it on/off whenever via the ...
2
votes
1answer
136 views

Triac substitute for BTA12 600TW?

Can I safely use a Triac at a higher specification than designed? e.g. for a BTA12 600TW, could I safely use a BTA18 800TW i.e. where the volt & amp values are larger than the spec?Thanks for any ...
0
votes
1answer
64 views

Choosing proper heat sink for a high power relay

I'm using this Solid-State-Relay to transfer 350 Watt: Input: 45VDC x 10A Output: 10VDC x 10A The following is derived from it's data sheet: Maximum junction temperature 150 C Junction to ...
2
votes
2answers
108 views

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. ...
-1
votes
1answer
92 views

controlling 2 kw,230v- infra red short wave heaters using electronic device

i want to control infra red short wave heaters 230v,2kw, with some electronic device, it is an open loop system,where i want to give analog signal to heater from 0 to 100% . i cant take Thermocouple ...
3
votes
2answers
188 views

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, ...
0
votes
1answer
117 views

Do all Solid State Relays function as diodes?

I just installed a solid state relay as the main power switch for a robot I'm working on. The robot is controlled by a Windows 8 tablet and I thought it would be cool to use the tablet to turn the ...
10
votes
1answer
2k views

Any obvious problems with this DIY home automation?

I'd like to know if anyone can spot any serious electrical issues in what I'm trying to do from an electrical viewpoint. Youtube Demo http://www.youtube.com/watch?v=BmsdXMbd2vo Short version: I ...
3
votes
2answers
372 views

Calculate minimum voltage to turn off/on solid state relay

I have an AQZ204 AC/DC type solid state relay AQZA204 datasheet Basically I want to calculate the minimum supply voltage required to turn the relay on and the minimum supply voltage required to turn ...
1
vote
1answer
53 views

AQZ204 Solid state relay

I have an AQZ204 AC/DC type solid state relay AQZA204 datasheet I'm using 31.5 volt DC supply, with a series 4.7k Ohm Resistor to the input LED of the relay. The data sheet is a little confusing to ...
0
votes
1answer
316 views

Measuring small Off state leakage current 10uA or less

I have a solid state relay an AQZ207 to be exact. I want to be able to measure the off state leakage current of the FET which in the datasheet seems to around 10uA Max. I had some ideas, but not sure ...