2 Pcs Z1507091/4 4 Pin DC 12V 40A Relay Truck Van Motorcycle Boat Multi Purpose Automotive Relay Heavy Duty Standard Relay for Car Motor, Auto Universal Relays

3 avaliações para 2 Pcs Z1507091/4 4 Pin DC 12V 40A Relay Truck Van Motorcycle Boat Multi Purpose Automotive Relay Heavy Duty Standard Relay for Car Motor, Auto Universal Relays

1. 

   Avaliação 3 de 5

   Grumman Driver – 7 de março de 2025

   REVIEWER QUALIFICATIONS:

   I’m an engineer (retired) and have been involved in electronics in one form or another for around 50 years. I started out in the vacuum tube days, eventually progressing to transistors and integrated circuits. I do tend to avoid SMDs these days because my old eyes just don’t like looking at things that small. 🙂

   PREFACE:

   There’s really two aspects of a relay that you should be concerned about — how much current does it take to activate the relay and how much current the relay can withstand.

   Unfortunately, sellers / manufacturers seem to fail to put on their specifications how many amps it takes to activate the relay. That might not matter for a relay targeted for winches or starters since they are such high amperage devices that it is obvious that you don’t want to wire them directly, but if you are using relays for LED lights, you might find yourself using a relay for something that your switch could have just as easily controlled directly. As such, I measure the current draw on all relays in my reviews.

   Measuring whether the relay can withstand the seller / manufacturer claimed values though is a bit problematic if you are not wanting to test to destruction and instead be able to use the product after the testing. Although as a Vine reviewer, I get these items at a significant discount, I am still paying *something* and I don’t select products for review for which I don’t already have a need. I want to use the products after testing, so I will not be testing to destruction.

   Since these relays have F2 type connectors in them, one thing to consider is whether they can even handle the amperage that the relay is going to be passing through it. F2 connectors are 0.25″ x 0.09″ (6.35mm x 2.28mm). This gives them a cross section of 14.5161 mm^2. This means that it is the equivalent of somewhere between a 5 and 6 gauge wire (just going by cross-sectional area). Let’s call it a 5.5AWG equivalent. Since 6AWG wire is good for 65A, then it should be good enough for that at least.

   As such, the F2 connectors are not going to be the limiting factor on whether this relay can work with it’s advertised amperage (40A).

   ACTIVATION CURRENT:

   The activation current is easy enough to test. I hooked up trigger wires between the relay and my power source and put my multimeter (set to measure amps) in series with it. I first test it on a 20A meter to see if it takes a large amperage draw if it is low enough, I test it on the milli-amp scale to get a more accurate value.

   Testing power source: LiFePo4 at 13.19V
   Measured resistance across activation pins: 76.9 ohms
   Calculated current to activate relay: 171.5 mA

   Measured current to activate relay: 165.8 mA

   INTERNAL CONSTRUCTION:

   It was easy enough to put a small screwdriver down the slots on each side and pry the inner working of the relay out of the case. It also clicked back in the case afterwards, so the unit was still usable. It might not be the most heavily constructed relay that I’m ever looked at, but given the fact that the F2 connectors are good for 65+A, I did not see anything in the case that would make me think that this was not good for 40A.

   One thing to note though… Since it was so easy to disassemble, this is most definitely not a “waterproof” connector. I would hazard to guess that it wasn’t particularly “dustproof” either. If you are going to submerge this relay or are in a very dusty environment, you might want to consider putting it in a secondary enclosure or sealing the gap between the inner workings and the outer case.

   CONCLUSION:

   Price-wise, they are a bit cheaper than what I saw from a cursory search on the website of one of the national auto parts supply companies. It looks to be a completely serviceable product, but I didn’t really see anything in the product that would make me want to give it above a 3-star (i.e. “average”) rating. Although this was a Vine suggestion and as such, I received a significant discount on it in exchange for an *honest* review, I would still consider buying it at list price if I needed some more relays for controlling lights on my Jeep.

   STAR RATING SCALE:

   1 — Poor product; Waste of money at ANY price; Blatant lies in the original listing.
   2 — Below average product; Something about it is a bit lacking; It could be conflicted specifications or errors in the original listing or that it was arrived with damage that was unlikely to have occurred during shipping and should have been caught in either the manufacturer’s or seller’s quality control.
   3 — Average product; Meets expectations, perfectly serviceable, but does not do anything that sets it apart from similar products; Does not have some features that makes me say, “Wow, that’s a neat feature”.
   4 — Above average product; Something about it sets it a bit above similar products on the market.
   5 — Excellent product (or perhaps customer service); There is NO room for improvement whatsoever; NOTHING is perfect, so this rating *should* be EXTREMELY difficult to achieve.

   Ordered:2023-12-29
   Received:2024-01-02
   Reviewed:2024-03-18

   AmazonID:B0CC29M8X9

2. 

   Avaliação 3 de 5

   GenuineEval – 18 de abril de 2025

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   I am a big fan of truth in advertising and I don’t feel like I got that with these relays.

   Quality: I am just not sure about the quality of these relays. They claim to be able to handle 40 amps at 12 volts, but the components seem a little light weight to me. I guess I will trust that they will do what they say. I did test one of the relays and it does function as advertised (no 40 amp load test though). See video

   Functionality: Where are the schematics, labels, numbers, something??? I went back to read the product description and look at the pictures. One picture has the schematic printed on the case, one has a part number, mine have neither just “Automotive Relay 12V 40A.” While I have been doing this long enough to know how to figure out which pins feed the coil wires and which are the switchers lines, I shouldn’t have to.

   Recommendations: I think I am being generous by offering three stars for these relays. No one wants to have to guess which pins go where. Maybe, as a direct replacement you wouldn’t have to guess, but there isn’t even a part number on these. In the end, I probably wouldn’t purchase these relays again.