CG Solid State Relay SSR-25DD DC to DC Input 3-32VDC To Output 5-240VDC 25A Single Phase Plastic Cover

I have been needing these for a long time and didn't even know it. Mechanical relays fail pretty quick in some applications and have other issues. This works perfectly with a control voltage of greater than 3 volts and is dead silent. No moving parts. The back is an awesome heat sink. Easy to mount and hook up. Love these things just ordered more.

Exact description, figment and fast delivery

I bought one of these a few weeks back and it works fine for spindle control. I decided to add a laser to the CNC I'm building so I ordered another SSR for controlling it. The second unit I received arrived with two stripped out screws on the wire terminals, scratches all over the terminal cover and notations in black sharpie written on the face of the SSR. The notations were wrong so whoever previously owned it most likely burnt it up, I didn't feel like testing it to find out. Return started. I paid full price for a new unit, I should have received a new unit.Edit 3/9/23: The replacement I received after requesting a return and replace of the previously used SSR I'd been shipped the first time has also been previously used, box arrived with a crimped lid, no thermal grease packets inside the box (supposed to have two) but that's because thermal grease had previously been applied to the SSR, all the screws showed signs of use. I was literally sent a second used item after having complained about receiving a used item the first time around. Stay away.

I have a DC-powered fan in my pinball cabinet that I wanted to turn on whenever certain effects happen, but the current draw of the fan was higher than the output from my electronics board allowed, so an SSR was needed. This takes an input current and when triggered turns on an output current for the fan. My only word of note - be sure and look at the diagram included with the SSR. I assumed I knew how it should be hooked up and was wrong - USE THE DIAGRAM!

Came with everything I needed

I've killed a couple accidentally because the output is one direction so if you feed in from the wrong direction for too long you kill it. Either toss in a slip of paper or label it better then these would be 5 star all day every day. And they get HOT so scrounge up some old computer heatsinks and JB Weld them on with a thin layer so you get heat transfer.

Seems to work well for its purpose. I had to design a box with a cooling fan for my use case. It’s a relay for my 110v silicone heating pad for the bed of my 500x500mm 3D printer. It’s exactly what I needed and works well!

I thought solid state relays (SSR’s) would be awesome, but they are troublesome and possibly dangerous is some applications. Here is why: I run a standard brushed DC motor directly off a solar (PV) array. The panels are older, so now de-rated from original maxes. The relevant numbers are motor (190V, 10.5A) and array only puts out (200V, 9A). Those are absolute max values - open circuit voltage and short circuit amperage - only seen with no loads, whereas they significantly drop the instant you use power). Unlike a wall plug or a battery, PV panels can never make higher voltage, nor more amperage than rated even if short circuited. Point being: with this array it is IMPOSSIBLE to put out more than 190V and 9A, EVER - even if motor stalls, even during start-up - never can exceed 190V, 9A.So… I wanted to add a sun-sensing circuit - turn on motor when tiny controlling PV (playing card sized; 5V, less than 2W) had enough sun to turn on the relay, connecting the big PV array to the motor. I bought several SSR’s, smallest 220V was 25A - way below my ABSOLUTE maxes. First one died after 3 minutes. Couldn’t tell though because the motor was still running. Put my hand over the tiny control PV (simulating shade) and motor kept running… but the SSR’s control light was out as expected??? Anyway, troubleshot for a few seconds until I suspected relay malfunctioning, so I disconnected the control wires AND MOTOR KEPT RUNNING?!?! Installed another SSR, same death. Knowing full well I could NEVER exceed the amps, still I bought an 80A SSR - waaaaaay overkill, but some mfg’s try to blame which side the load is on, some blame start-up amps and give factors for oversizing relay amps (although most Amz resellers don’t mention this), with the worst case I’ve seen being up to 7 times oversized. Again, shouldn’t apply to me, it is IMPOSSIBLE for my array to EVER put out more than 190V or 10A, but I played their game and even oversized all their oversizing factors (I was nearly 9x oversized). SAME DEATH! Motor still running with no control wires attached!To me, the key safety feature for any relay (or any electrical device), is that it must not fail in the on position. If anything, a problem should result in no power - think chainsaw saw that won’t turn off, or EV that keeps going when you let off the throttle. That’s what I meant by dangerous - these SSR’s can ‘mysteriously’ die, but when they do they can stay on - never turn off.I was extremely disappointed, because SSR’s have such great promise - use very low power to control very large power circuits and have a very long cycle life, since no mechanical/arcing wear. However, be here warned, there are apparently at least some applications (undefined as to how or why) where they just don’t work, and could fail in the on position! Also note, I tried various mfg’s, so I don’t blame any particular Amz seller or brand - and each seller got this same review.For what it’s worth, and for those who know, my guess is that you may need a (large enough) flyback diode on the load side for when a large PM DC motor is unloaded (then the motor acts as a generator as it spins down). If so, the mfg’s should build them in to the relay for general use.Hope you found all this helpful.

No funciona como un relavador normal energizado o no este se mantiene activado

Thank you