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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40 views

Will an SSR work with mains voltage less than 240V? Which datasheet parameter mentions this?

I am planning to use an SSR in the secondary of a step down transformer to control a heater. My question is what parameter should I check out in the datasheet of the SSR to ensure that the SSR will ...
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1answer
47 views

A circuit similar in working to a NOTC relay? [closed]

How do I build a circuit that gives out a "high" only when given in a "high" continuously for a preset time period? The input is actually the out from a logic gate. The following details have been ...
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1answer
29 views

Optimal method for switching power to a DC motor spindle

I'm trying to use a 5V DC signal from a microcontroller to electronically switch power to a DC spindle (for use within a router I'm trying to build). The supply I'm using is a 48V-DC PSU (8.3A rating)....
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2answers
53 views

Create SPDT relay from two SPST solid state relays

I'm trying to use two solid state SPST relays (P/N SAI4003D) to act like an SPDT relay. Ideally both will be controlled by the same signal wire. The relays state that they are "on" at 0 volts, so my ...
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1answer
37 views

Will using an SSR on the secondary side of a transformer lead to heating due to harmonics?

I have a resistive heater with a resistance of 18 Ohms. The heater is mounted on a job which has a thermocouple mounted on it. I need to use a SSR based controller to control the temperature measured ...
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3answers
135 views

A question on zero crossing versus random-fire SSRs

Figure 1. I have the above mechanism, where I control a single-phase fan motor's switch. I mean instead of a mechanical switch, an AC/DC SSR is switching ON or OFF from a remote place by a constant ...
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3answers
50 views

Can I short circuit the SSR load terminals?

I'm using an SSR but I would also like to be able to turn on the circuit using a switch. Can I use a switch in parallel with the SSR load outputs? This would cause a short between the terminals. The ...
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2answers
55 views

Solid state device for switching (muxing) a bipolar high current signal

I'm looking into solid state relays for an application where I need to switch between two different transducers to allow two different modes of operation for an echo sounder. Basically a MUX that ...
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2answers
92 views

Solid state relay operation without transistor

I have this solid state relay, it's specify that it can run at 5v/16mA. I just want to make my board as simple as possible, so i've been thinking to remove transistor. Is that safe for GPIO/PORT or ...
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3answers
164 views

Activating SSR for an AC motor via PWM input

I'm currently switching a single phase AC fan motor with an SSR. Here is the following SSR: http://www.crydom.com/en/products/catalog/s_1.pdf I activate this relay by applying continuous analog 10V to ...
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1answer
55 views

Using AC relay with DC voltage

I apologise in advance if this is the wrong forum, or I'm not providing enough details. I'm building a thermostat zone controller on a raspberry pi and I've encountered an issue with the relays in my ...
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3answers
78 views

interchangeable operation of two electric motors without PLC

I have two motors that drive an air compressor. I have a pressure switch to turn the motors on/off. The sequence I want is: when pressure switch turns ON - motor 1 starts, when pressure switch ...
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2answers
86 views

Solid State Relay Stuck in Closed Position

I'm building a simple circuit to control a 100W that takes 30-34V using a 30V LED power supply with constant current of 3.2A. I am controlling the switching of the LED with a Crydom DC60S5 connected ...
2
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1answer
43 views

Which diode configuration do I need for this solid state relay?

I want to add snubber or supression protection diodes for a solid state relay. Here is the diagram without the diodes: And this is the SSR I'm going to use: http://uk.rs-online.com/web/p/solid-...
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3answers
138 views

How do I control the brightness of an LED street light

I am currently using a DC-AC ERI Solid state relay (Model number 001J) with a PIC16F microcontroller to control the operation of an LED street light. I have dumped a PWM code onto the microcontroller. ...
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2answers
77 views

Help choosing a relay for pump control

I'm building my first arduino project, and I could use some help building up the relay portion. My goal is to control a water pump that's running at 110V, 3/4hp, rated at 9A, and measured to run at ...
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votes
2answers
144 views

I want to design over voltage cut off circuit using mosfet [closed]

I am trying to design a LED driver (flyback topology) of 40W (50V and 800mA) with nominal input voltage 230V. I need over voltage cut off circuit on input side , i don't want to use ready-made SSR , ...
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1answer
95 views

Why can't I switch an SSR with another SSR?

I have a DC SSR (Phoenix Contact 2964270) configured with an input of 0 - 5 VDC. It is trying to trigger a system with a sinking input SSR (Phoenix Contact 2966595). I have a 10K pull down resistor ...
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1answer
51 views

Mechanical Contactor for High Voltage DC - Substitute with Semiconductor

To switch 1kV DC at 5A, I usually use a mechanical contactor (<- Wikipedia) that switches both highside and lowside of a resistive load. Any suggestions on a semiconductor (or non-mechanical part) ...
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1answer
45 views

Solid State Relay from CMOS pin

I want to operate the LCC110 solid state relay from a 5V CMOS output pin on the PGA2505. I can see that I will likely need 8mA to drive the relay. However, I don't see on the PGA2505 datasheet if it ...
4
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2answers
393 views

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?
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1answer
70 views

Is a “self-bootstrapping” zero-crossing AC power switch possible?

As a follow-up to this prior question I'm looking for a zero-crossing mains (120V) power switching solution to mitigate the bounce-related EMI I'm getting using the "stock" traditional ON/OFF toggle ...
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3answers
149 views

Difference between optoisolator(optocoupler) and solid state relay?

I have been looking into relays and optoisolators. I am aware that there are different optoisolators, with some having a transistor on the detector side which allows current to flow in one direction ...
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1answer
43 views

Use of a Gas Discharge Tube to protect mains relay

I have a system that I am designing where I am interrupting the low side of a high voltage transformer with a relay, something like this (input: simulate this circuit – Schematic created ...
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0answers
20 views

NI 6525 over current protection

I use National Instruments NI 6525 device and try to think about a way that will protect one of it's output ports from an over current situation. I afraid that an over current will come from the ...
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0answers
36 views

solid state relay latched closed

I am using a crouzet solid state relay, specifically 84 134 870 (DC>DC 30A FET output) to control a 3d printer heat bed with PID. The other day the MOSFET controlling the heat bed output died and I ...
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4answers
147 views

How to control a blower using the analog output from a PID controller?

I built a biomass burner which is powered by a blower. For precise control of temperature I am using a PID controller PID500 from a company called selec . I passed the PID analog outuput to a VFD ...
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7answers
199 views

Is there any device which allows the flow of electricity after certain wattage? [closed]

Is there any device which allows the electricity to flow only after a certain wattage and not below it ? Something reverse of circuit breaker
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2answers
48 views

PhotoMos relay -calculating the right resistance value and input voltage

For a EM coil relay I would choose the input voltage based on the coil rating. And a freewheeling diode based on maximum reverse voltage that appears across the coil. I am not able to find something ...
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1answer
53 views

Choosing between a darlington array, H-bridge, and solid state relay

I'd like to use an arduino to switch four separate lamps independently, each of which requires 12VDC and 200mA. It seems to me that this could be done with an H-bridge, a darlington array, or solid ...
0
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1answer
176 views

Switch between two low voltage signal sources

I'm new to this community so I apologize if this isn't posted correctly. I am looking for a circuit that could switch between two low voltage (1v or less) DC inputs to a single output. Oxygen sensors ...
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1answer
48 views

Help with using S26MD02 Relay as a Switch

Hello i'm fairly new to electronics and I'm currently trying to use a S26MD02 Relay from Sharp as a Switch with DC sources. The main problem is that I dont understand the schematic diagram provided as ...
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3answers
213 views

Why and when do SSRs heat?

I'm using a 40A 120VAC SSR to control a 10A resistive load. It gets hot during use. Is this heat associated with the switching, with the load current, or with the voltage? And where does it come ...
0
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1answer
31 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 can'...
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1answer
104 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 ...
2
votes
2answers
41 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 S201-...
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2answers
79 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
187 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
45 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 '...
4
votes
2answers
94 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 ...
2
votes
3answers
167 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 I'...
0
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1answer
196 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 ...
0
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3answers
190 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 ...
0
votes
1answer
75 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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votes
1answer
70 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
188 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 ...
0
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1answer
109 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 ...
2
votes
1answer
45 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 (...
2
votes
1answer
207 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
163 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 ...