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Single Phase Solid State Relay Module, 25A-120A,DC to AC，DC to DC，AC to AC
Single Phase Semi-Conductor solid state relay, a variety of models for users to choose, to meet various needs. Precise adjustment, Because there is no mechanical contact with the solid-state relay components,providing users with a more stable and quieter working environment. Long service life span.
- High reliability, high efficiency and long service life
- No sparks, no noise, and no contact
- High sensitivity, fast response, and fast switching speed
- Drive voltage and current are low
Voltage range of the different solid-state relays:
- SSR-DA:Input 3-32VDC to Output 24-380VAC
- SSR-DDInput 3-32VDC to Output 5-220VDC
- SSR-AAInput 80-250VAC to Output 24-380VAC
Compact, efficient solid-state relays, demonstrating superior light control in the switching field, bring unlimited creativity to stage lighting systems. Installation should pay attention to fire prevention, heat dissipation, moisture-proof, to ensure the best performance and service life. As a multifunctional application product, it has been widely used in various occasions.
The application of a single solid state relay with a variety of models
Solid state relays can be widely used to control computer peripherals, traffic lights and scintillators, 3d printers, power and temperature control, lighting and stage lighting, CNC remote control systems, automatic fire and safety systems and industrial automation equipment, and other industries.
Jay Kay
2025-06-23 12:42:24
I installed the SSR-40AA Solid state relay to switch a 5 hp 220 volt electric motor on and off 3 times per hour for 12 hours a day, every day of the month. I fitted the solid state relay on a finned heat sink with the required heat transfer passing between the heat sink and relay.The electric motor draws 23 amps and spikes up to about 26 amps at startup. What works for me is to select a solid state relay that can handle at least 50% more amps than what I require. In this case it would be a minimum of 39 amps. The SSR-40AA solid state relay rated at 40 amps was a perfect fit.This relay has been working nonstop every day for 12 hours for the last 8 weeks, with no sign of overheating. This was a great find and reasonably priced.Review for: MAKERELE 3PCS Single Phase SSR-40AA Solid State Relay AC to AC Input 80-250VAC to Output 24-380VAC AC Solid State Relay 40A
Quality First
2025-06-18 12:00:54
I like these relays for my custom control assemblies. I have used them to build a custom heated hose for my spray foam rig as well as to control switched loads from a thermostat. They are easy to install, have an inducator light to see if they are triggered and functional. I usually mount to a heat sink for cooling but do not know if that is required. They are a cost effective solution for repairing relays in my radiant heating system as well
Bob_Bryan
2025-06-14 11:47:02
Am I rating solid state relays in general or this item? Maybe a little of both.Solid state relays are amazing. They are silent with no flashing as they switch. Since I have the DC-AC version that uses DC control power to switch AC power, effectively, when I provide DC power, asking to switch, it waits until a zero crossing of the current before actually turning the power off which has the effect of avoiding the arcing associated with electromechanical relays."Minor annoyance," they are not magic. Electromechanical relays have physical contacts that allow the current to flow. The heat generated in the relay is determined by the (low) resistance of the contacts. These are implemented with a TRIAC, effectively, two SCRs (Silicon Controlled Rectifiers) back to back. The heat generated, again is determined by the resistance of the TRIAC but that is a bit greater than mechanical contacts. I put one of these without a heat sink, running with a 0.9 amp, 100w load. It got warm sitting on the bench but not too hot to touch. I then used it to run a 8.5 amp, 1000 watt load WITH a moderate heat sink and it got pretty hot, about 120F. I measured about 11 watts going into my heat sink. The unit I have says it will run 25 amps. I expect it would do that just fine BUT YOU GOTTA KEEP IT COOL. The heat sink I had would be no where near big enough. Keep in mind, if you don't keep it cool, it will burn itself up.Switching? The unit I have says it will switch from 3 to 32 VDC. When I ran the voltage down, it stayed on until I got to about 2 volts when it started to flicker. The current draw of the control power was about 15 milliamps at 5 VDC. That is low enough to where I can use the GPIO output from an ESP32 to drive one of these. The unit I have controlling my heater is plugged into a USB charger.I made a flashing light display a while ago with mechanical relays. They promptly self-destructed. The arcing of the contacts takes them apart. I replaced the mechanical relays with a unit like these and it can flash all day and all night without issue. This is exactly what I needed.
Tom Gee
2025-05-13 19:55:40
These solid state relays offer quiet switching of high voltage loads. In my case I neded a relay to switch my batery charger on every month for about an hour to keep my Home Backup Batteries topped up. I'm using a small raspbery Pi computer to control these relays to switch on the 110 VAC load which powers the batery charger. The Pi of course runs Home Assistant.
Daniel B
2025-04-07 15:43:50
Got these because sometimes SSRs are a usable replacement to a normal relay (mainly because of noise). They have been working fine for far. I'm skeptical about the 60A rating (even using a decent heatsink) because I don't have that big of a load right now and i can't tell how well it's dissipating to the metal base of itself, but for a simple couple amp load at most, they've done just fine. Powering them off 24v DC. They seem built decent.
Josh
2025-02-23 15:17:01
Oddly, one of these was acting kind of freaky in my system. The other two worked fine. Used in a greenhouse system for controlling heating, and thus far the two that worked fine haven't presented any issues. That said, a 1/3 failure rate makes me a bit nervous. Didn't notice any immediate build quality problems with it. They're packaged cheaply so perhaps it was damaged in transit.
MWZ
2024-12-17 13:11:54
I ordered just the heat sink, to use with a relay I already had. Its identical the ones that came with many SSRs. My only criticism is that it's bare aluminum, I prefer a black finish because it makes the heatsink more effective, and prevents oxidation. A quick coat of flat black paint will do the job. Flat black paint is more efficient than anodize.
Victor Blake
2024-12-07 12:33:03
Can't say I've tested at 25A, but these handle a 20A rated load (typically less like 16A on same) with no issue. Heat sink compatible/recommended for loads that are on for long periods. Short loads (like a pump) I don't think a heat sink is needed and I find the SCR's more reliable than mechanical contactors for high cycle count like pumps.
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