I have a pump that I need to switch on and off with a float switch and it can't pass that kind of current. This contactor is perfect for that purpose. I like that it has a din mount so that I can put it into a project box. Everything is reasonably well labeled. It engaged as needed when 24v is applied. I do wish there were a way to manually engage it, but that's getting harder to find these days. The real question is how long it will last.

So while I do not have these in actual service yet, I have tested them on my bench hoping for good results before putting them in service. I will give my best observations in hopes I can help someone make a better educated decision on these relays.Fit and finish are very good. Screw terminals are good for appropriate wire to amp ratings. The female threaded part appears to be a little thinner material than I would like to have seen. I would advise being watchful not to over-tighten the screws just as a precaution.Measurements across the contacts when open or closed are very good. Less than an ohm reading when closed, and infinite when open. I have not attempted to open the unit and look at the physical size of the contacts. I do not know if that is an act that can be done or not. This brings up what I consider the most negative aspect in that, it would appear the contacts can not be serviced.They have a positive snap when actuated, and very little AC hum. You can barely hear them if you have them resting on certain surfaces. Otherwise, nothing I can hear when holding them at arms length.I contacted the company to ask if they offered an auxiliary contact block to mount on the side of these relays. Their response was that they do not offer them, however stated that these relays are designed to accept them and I should check with other manufactures. I did so and found out that Baomain makes an aux contact block that will work with these relays. I ordered a set, and have confirmed they do work.I would say that these will likely work fine for the average DYI enthusiast. But I do not believe I could trust them in an industrial environment. That is because I retired from an industrial environment and used relays/starters/contactors that are designed for that purpose. Those are seemingly heavier built, and most are serviceable. These do not have the hard-plastic feel that similar industrial grade units typically have either. Industrial grade units are usually designed to withstand high usage and a hostile environment (oils - dirt - heat - etc.). These could be the same material, but thinner...just an observation without confirmation. Will that matter in your application??Unlike most industrial contactors, there is no means of manually actuating these relays without power applied to the coil. You can not physically press on a button to force the contacts to swap states in order to check them without power.I also have the 100 amp, 4 pole NO contact version of this relay. I can say the same thing as above about this relay as well except for one other observation. In the 100 amp relay, there are apparently two coils to actuate the contacts. So it is basically 2 relays in 1 housing. If interested, you will need to decide for yourself how you feel about that.So testing what I can test and elaborating a little on what I think from my experiences. They seem very good, but have room for improvement if they intend to compete with industrial type units. I hope this is helpful if you are considering them.

I am very much impressed with the quality and specifications of this 40/60A 4 pole contactor by SHOPCORP. I am in the middle of rewiring all of the lighting circuits in my home, separating all of the non-essential circuits from the essential. The non-essential circuits will be controlled by this contactor. I am programming an Alexa enabled switch to control this contactor so that with one Alexa program and wall switch, all of the non-essential lighting circuits can be enabled for use or disabled for use. So you can say, "Alexa, disable non-essential circuits" or, "Alexa, enable non-essential circuits". You can also just use the physical wall switch to do the same thing. Enabling the circuits does not mean turning them on, it only means making power available to those circuits. They will still be controlled individually by their respective wall switches. Essentially, I am just making a way to turn off as much as possible, as easily as possible to save on my crazy-high electric bill which currently averages about $500 per month. I will probably do the same thing with outlet circuits and a much larger capacity contactor, but we'll see how this first phase turns out first.Review for: SHOPCORP 63 Amp 4 Pole 2NO 2NC IEC 400V Contactor (Silent Operation) – 110/120VAC Coil, 40a contactor Motor Load and Lighting Load 60A with Mounting Base for DIN Rail 2408-064

It seems difficult to find NC contactors, so this fit the bill of what I needed. Made more sense than energizing an NO contactor 24/7, only used sparingly to disconnect a load. This worked well for a three phase 30 amp circuit, no heat from the contacts. The only issue I had, which is minor, this contactor does not have aux contacts to indicate contactor position. I was able to use the R7/R8 terminals for this task, but if you're needing to use all four high-current contacts AND need position feedback, this contactor won't work for that task.

This SHOPCORP 60 Amp 4 Pole Normally Closed (NC). IEC 400V Contactor is indispensable if you are setting up an I&C PLC type control structure for your small hobby processes (ahem brewing you say?) When correctly placed in the control circuit a NC contactor like this can be used as a safety shut off to prevent damage to the process or equipment. This unit is beefy enough to handle the loads you will see in any common control loop.

Good quality and pretty quiet contactor.

At the heart of any electrical installation are the safety devices that ensure reliable operation. UL (Underwriters Laboratories) certification indicates that a product meets rigorous safety standards. The 3-pole switches rated by UL are particularly important in systems demanding high power, such as AC units and HVAC systems. These switches are designed to handle heavy loads safely, preventing accidents, overloads, and potential fire hazards. Incorporating UL-rated components enhances the safety of lighting and HVAC systems, providing peace of mind to users. The installation of these switches should be done by qualified professionals to ensure compliance with local electrical codes and regulations. We've been able to trust this part in our home repair, and highly recommend it!