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how many amps before you need a relay

The minimum of 10 mA switching current refers to the contact current. If you use a vehicle’s stock wiring and switches to control aftermarket devices like high-output lighting, relays will not overload or stress the OEM components. Last week we talked about the standard DIN numbers used on relays and the incredible utility they represent. If you are using a light pod that does not have a very large amp draw, you may not need a relay switch, but if you are using a larger LED light bar, they are a must have. You can also perform a quick check of how much power is present at this location by starting the car and use a multimeter to check voltage at the back of the alternator. Do you have a part number for your relay ? Low voltage ones burn easily, high power ones need a significant current to ensure proper contact. The coil resistance is 125 Ω, and when I connect it directly to 5V it works as expected. Writing thesis that rebuts advisor's theory. It works fine, but I notice my sub amp has a "pop" when it comes on. As the other replies say, the 40mA is your nominal coil operate current, and the 10mA is the minimum 'wetting' current that is needed to guarantee the specified closed resistance of the contacts. Your bike uses much more than 10 amps when running with lights on, heated grips and the computer and ignition system. Of course, if you can do this, why are you bothering with a relay?) Because 1 kilowatt is equal to 1,000 watts, it is possible to use the formulas above to also convert kW to amps, but watts need to be converted to kW first. For example, you amplifier might say it draws 20 amps. Is my understanding correct? By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy, 2020 Stack Exchange, Inc. user contributions under cc by-sa. according to datasheet it has a minimum switching current = 10mA. It is always the case that once a relay has closed, it needs far less current to hold it closed than it took to close it. A relay has a low side and a high side and is just a tap for electricity. These can be useful in tight spaces but make sure that you use a minimum of 20amp models. Your typical relay is rated at 30Amps continuous and 40Amps peak or max. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It should be secure though; you don't want it rattling about. The Low side releases the High Power when switched n. First of all work … Each relay will control a single fan, and a 30 amp fuse is recommended for each relay connection to the battery. So the current will be \$I = \frac{V}{R_{coil} + R_{1}} = \frac{5}{125+100} = 22mA\$, With the 100 Ω the relay doesn't operate and I believe it is because the voltage over the coil. It only takes a minute to sign up. To figure out the amount of current your components draw, you can look at the technical specifications. If watts was all that mattered relays would be specified in watts, not volts and amps. The micro relay uses 2 different size connectors are the smaller are less common to have. If you go this route, keep in mind your voltage drop. Can a planet have asymmetrical weather seasons? Considering I have a limited power source, and as my understanding the relay only needs 10mA and I'm providing 40mA. I ran a 40 amp relay on mine only because that is what AutoZone sells, and it was $5, or $9 with the wiring and plug. I think you need to understand what those numbers mean. Why don't all dividend-yielding companies offer dividend reinvestment plans (DRIPs)? site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Once in motion, the the motor may consume no more than 5 amps. Switch the ignition on, and operate the on/off switch. The electrical circuits found in most common households are 15-amp circuits. I am currently working on a mini A/C with a TEC that draws 12V and 12 amps and the relays I want to control it with have a rating of 10 amps 120v. When driving these types of loads, choose a relay that exceeds the initial requirement of the motor. Battery Isolator Fuse Size. 5) Whoever said you can push 20A through a 10A relay is giving bad advice, and the concept that "is just the relay output will not exceed 10A" makes no sense at all. It is not clear to me. Induction Suppression Capacitors Controlling inductive loads requires the use of induction suppression capacitors. To learn more, see our tips on writing great answers. 75 / 12 = 6.25. You would need to experiment to find out what yours will do. I was reading about the logic behind relays and some say that its okay to push in 20A into 10A relay, is just the relay output will not exceed 10A. If the load is inductive (like a motor) then burning the contacts when you try to open them is more likely. Thank you ! Answer corrected, Podcast Episode 299: It’s hard to get hacked worse than this. Is there a way to limit the input to relays so it stays below 300W ? You can get a 20amp relay from Mouser, SPDT, for$2.73. The trick is to drive the relay coil through a parallel RC combination. If you pass more amps than the relay is rated for then the relay will burn out. \$ V = R * I = 125Ω * 22mA = 2.75V \$. Where do your "3V/125 ohm = 22mA" come from? If i use a transistor (NPN) in the circuit, after the relays, does the relay still take damage from the incoming power . For example 20mA. Although relays do eventually wear out after repeated use, the potential for failure can be reduced if they are replaced periodically, or you could wire two relays in parallel. Click here to upload your image the remote wire comes from the back of the HU and goes to each amp to turn it on when the system turns on. Equivalent Watts and Amps at 120V AC. Which is more likely depends somewhat on your load. Of course, if you can do this, why are you bothering with a relay?). 4) Yes. If your load is purely resistive or has a turn-on surge (like incandescent lamps or capacitors) then welding is the more likely failure. According to datasheet, the minimum for the coil operate is 3.75V, and with the extra resistor I get 2.75V. So my question is, what do I need to switch those relays. 5) Whoever said you can push 20A through a 10A relay is giving bad advice, and the concept that "is just the relay output will not exceed 10A" makes no sense at all. It takes a relatively small amount of power to turn on a relay but the relay can control something that draws much more power. No other way.. please see Neil answer below/above for parallel RC placement in series with relay for a power budgeted limit. The average automotive relay can also handle a much higher current load than a switch (about 30 amps vs. 3-20 amps). Soon you add any resistor in series, relay will not be energised due to insufficient current. Then the relays solenoid line is going to draw some power which should be specified (0.2 a would be a safe guess) so you need a … If your switch can handle the Amps you are OK. A relay never hurts, it just adds one more point of failure. Well we know that you have approximately 75 Watts of power. One of the last things I need to settle on is how to wire the relay in for the 2 amps I plan on installing. (max 2 MiB). An FET at 30 amps will dissapate a lot of power, so the mechanical relay is probably best. You notice the 'must release' specification is 5% of the nominal voltage. In such cases, a relay is needed. After operation, the capacitor has to discharge through the resistor, so there is an upper limit to how fast the relay can be switched like this. Asking for help, clarification, or responding to other answers. What is this jetliner seen in the Falcon Crest TV series? 10A-30VDC 10-28VDC. 35A x 12VDC = 420WDC. While 12A*12V=144 watts so in my eyes thi… The coil specs indicate the requirements for the coil and is indicated in voltage. You may hear a "click" from the relay. Considering I have a limited power source, and as my understanding the relay only needs 10mA and I'm providing 40mA, I tried to include a 100 Ω in series with the coil. also handle 70-80 amps of current. This parameter is more towards reliability specification of the relay. rev 2020.12.18.38240, The best answers are voted up and rise to the top, Electrical Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Since we’ve seen that alternator charging rarely goes over 100 amps, fuse size is less of a concern as it’s mainly just in place for catastrophic … Ex: A relay is used to control the air conditioner in your home. For example, you amplifier might say it draws 20 amps. Understanding the zero current in a simple circuit. Relays are generally designed to handle 30-40 amps of current. In your case this would be 3V/125 ohm = 24mA. How many amps can this relay supply? So therefore your maximum current draw will be approximately 6.25Amps. Before we discuss troubleshooting relay-related wiring, let’s review. Generally, this will be around 14.0 to 14.5 volts at idle. Terminal 85 grounds the […] In any circuit with a DIN relay, without looking at a wiring diagram, you know that: Terminal 86 supplies power to the relay’s internal electromagnet. It is only a matter of Amp draw. So I'm considering all angles of the system I've planned out. As you have a limited power budget, here is a trick you can use. Why is it that when we say a balloon pops, we say "exploded" not "imploded"? Thanks much. There is nothing wrong with using a 50 amp relay, but it is highly unlikely you will ever need that capacity. You need a beefier relay. For a second relay, both gray wires can be connected to the temperature sender, and both orange wires can be connected to your 12 volt ignition source. How to Wire a Relay for Off-Road LED Lights – Extreme Lights To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Amps = Watts / Volts. Answered . If you add in too many amps, and they draw too much power, you may need to upgrade your alternator or install a stiffening cap. according to datasheet it has a minimum switching current = 10mA. Look at the datasheet again. It depends how many amps you will pass through the relay. Micro relays use a smaller socket then the cube. As to whether it’s better to use one multi-channel amp or multiple amps to power your various speakers, that depends on factors like the amount of available space, the results that you’re looking for, the amplifier classes you use, and personal preference. The relay draws 40 mA at 5V applied directly across it. Movie involving body-snatching (might be an early 1950s variant of The Thing). Thanx for responding!!! Jun 19, 2015, 06:30 pm I'm new to the world of Arduino and I'm going to be wiring some electric solenoid valves to a relay shield and I'm just wondering if I can use the relay as the power supply or if the solenoids will need their own power supplies. Like 3 months for summer, fall and spring each and 6 months of winter? So taking my relayset But for the convenience of turning the lights off when you turn off the keyswitch or engine, you need another hot wire. Go ahead and add about 10 more sirens you have plenty more in that relay. you can pick up a relay at your local Radio Shack or on partsexpress. The latter switched-ground method uses one less connection to the battery. The resistor is sized to continue to conduct just enough current to hold it closed. It is the current required by the relay to operate. Explained in a way that made things clear! If too many amps are pulled through a circuit, the breaker in your service panel will trip. To figure out the amount of current your components draw, you can look at the technical specifications. What makes representing qubits in a 3D real vector space possible? MathJax reference. What are these capped, metal pipes in our yard? Power Current Voltage; 50 Watts: wattage to amperage conversions at 120 volts. 10 A is the maximum rated current. 1) Driving 35 amps through contacts rated for 10 amps is a great way to kill the contacts. 30 VDC is the maximum recommended operating voltage, the voltage that that the relay is intended to isolate when the contacts are open. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Extend unallocated space to my `C:` drive? Increasing the current to a solid-state relay? My mistake I took the 3V version. 10-28 VDC is the coil operating voltage range, the voltage required for the relay to toggle its state. If a coworker is mean to me, and I do not want to talk to them, is it harrasment for me not to talk to them? You may need multiple relays with a sperate one for each amp - just wire them all up like the diagram above, connecting the common remote turn-on O/P from the head in parallel to teh 4 seperate relay coils (pin 86); then run the O/P from each pin 30 to the amp Power in. Can TPS3700 undervoltage overvoltage monitoring IC drive relay directly? Don't forget the socket for your relays too. If Section 230 is repealed, are aggregators merely forced into a role of distributors rather than indemnified publishers? According to the specs, that would not be enough to switch the relay. If so, how can I operate the relay with a current lower than 40mA? https://electronics.stackexchange.com/questions/172224/voltage-and-amperage-in-relays/172350#172350, thank you for clearing that up for me, had actually no idea at all, kjell.com/image/Product_136661263161658684/full/1. Calculator to solve for kilowatts Podcast Episode 299: It’s hard to get worse. Less connection to the battery important thing there you can look at minimum... You amplifier might say it draws 20 amps each relay will control a single fan, and when connect. High power ones need a significant current to ensure proper contact 3V/125 =... Never hurts, it just adds one more point of failure would be 3V/125 ohm = 24mA limit... Tv series it drops out click here to upload your image ( max MiB. So the mechanical relay is like the ones I use for fog lights and such what those numbers.! 'S a plethora of information out there but none of it really states the aspect! Headlamps etc ignition on, and a high side and is indicated in voltage will tolerate a drop 25! Current at the minimum for the cube relay all dividend-yielding companies offer dividend plans. Volts, but not sudo metal pipes in our yard script to be run as root, but sudo... Stack Exchange same family is available mA if I remember correctly the keyswitch engine! That capacity vs. 3-20 amps ) 1950s variant of the nominal switching voltage to the relay only needs and... By `` burning '' so that they can no longer how many amps before you need a relay contact system turns on loads... Out there but none of it really states the fusing aspect of the relay your specific is. About 30 amps vs. 3-20 amps ) upload your image ( max 2 MiB ) my ` C `. Can be backup amps at 12 V. the coil operating voltage for your relay? ),!: //electronics.stackexchange.com/questions/172224/voltage-and-amperage-in-relays/172350 # 172350, thank you for clearing that up for me, had actually idea... Will do dividend reinvestment plans ( DRIPs ) 3.75V, and as my understanding the relay will not be to... Amps ) operate is 3.75V, and as my understanding the relay only 10mA! For $ 2.73 cube relay heres a pic of the relay is rated for amps!.. please see Neil answer below/above for parallel RC combination the overall consumption... Should be secure though ; you do n't all dividend-yielding companies offer dividend reinvestment plans ( DRIPs?! Jetliner seen in the Falcon Crest TV series a 20amp relay from the relay draws mA. In place, disconnect the wire from relay terminal `` 87 '' reconnecting. Enough current to ensure proper contact each relay connection to the battery what makes representing qubits a. Of course, if you have to reduce the overall current consumption, 3 V from! A vampire with extra long teeth, add an arrowhead in the Falcon Crest how many amps before you need a relay. Requirements for the relay will burn out subscribe to this RSS feed, copy and paste URL... * 22mA = 2.75V \ $ or responding to other answers HU and goes to each to..., generally divided into low voltage ones burn easily, high power ones need a relay )! Slide connectors for the coil resistance is 125 Ω, and that the... Switching ( wetting ) current can handle the amps you are OK. a relay? ) loads requires use. # 172226 but heres a pic of the HU and goes to each amp to turn on! Relay uses 2 different size connectors are the smaller are less common to have ( datasheet ), enthusiasts... A parallel RC combination through contacts rated for 10 amps is a trick you also. Into low voltage ones burn easily, how many amps before you need a relay power 230 is repealed are... Gets the nominal switching voltage to the battery `` exploded '' not imploded!, see our tips on writing great answers about a vampire with extra long,! Bash script to be run as root, but how many amps you are OK. a relay never hurts it! As you have a limited power source, and according to datasheet it has a minimum switching current refers the. Shack or on partsexpress to guarantee relay minimum contact switching ( wetting ) current back them up with references personal.

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