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PAC 500 Watt Battery Relay and Isolator, Amp Relay, 12 volt Battery Disconnect Relay, Water-Resistant and Extends Battery Life (500 Watts)

4.4 4.4 out of 5 stars 152 ratings
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  • 500 AMP Relay/Battery Isolator
  • Used to isolate a second battery powering audio, visual navigation, or other equipment.Does not create a voltage drop to the second battery like conventional isolate
  • Prevents the equipment from discharging the main battery when it is operated while the engine is off
  • Extends battery life
  • Handles 500 amps continuous and 700 amp surges
  • Used to isolate a second battery powering audio, visual navigation, or other equipment
  • Useful for completely isolating equipment from power when off

Product information

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PAC

PAC 500 Watt Battery Relay and Isolator, Amp Relay, 12 volt Battery Disconnect Relay, Water-Resistant and Extends Battery Life (500 Watts)

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What's in the box

  • amp relay

    • Product Description

    500-Amp Relay/Battery Isolator

    Customer reviews

    4.4 out of 5 stars
    4.4 out of 5
    152 global ratings

    Customers say

    Customers like the performance, quality and thud of the auto accessory. For example, they mention it works well, makes a good thurd when turned on and is a perfect solenoid for high current automotive. That said opinions are mixed on sturdiness and ease of installation.

    AI-generated from the text of customer reviews

    19 customers mention16 positive3 negative

    Customers like the performance of the auto accessory. They mention that it works well, it makes a good thud when turned on, and that it's easy to install.

    "...This thing had its ground and remote turn on leads shorted and kept on working...." Read more

    "Worked perfectly as a 1-1 replacement in my GMC Yukon providing power to a 2500W inverter...." Read more

    "...Works great" Read more

    "Product works great, problem is the installation instructions suck for a dual battery system, you will have to go online and look up how to install..." Read more

    9 customers mention9 positive0 negative

    Customers are satisfied with the quality of the auto accessory. They mention it's an excellent product, a perfect solenoid for high current automotive, and a great battery isolator.

    "...This is the only solenoid I found that is rated for 500A. Perfect solenoid for your high current automotive project." Read more

    "excellent product" Read more

    "Great product. It is now installed and has actually been called upon to serve its intended function. I performed well." Read more

    "Very Good Battery Isolator!..." Read more

    3 customers mention3 positive0 negative

    Customers like the thud of the auto accessory. They say it makes a good thunk when turned on, and the Audible relay switching sound is satisfying. Some mention that the product engages with a nice metallic clunk.

    "Does just what it said it would do. Engages with a nice metallic 'clunk', and turns off seamlessly...." Read more

    "Isolator works great. makes a good thud when turned on. I like hearing it work." Read more

    "Audible relay switching sound is so satisfying." Read more

    3 customers mention3 positive0 negative

    Customers like the weight of the auto accessory. They say it's heavy and feels like a good heavy solenoid.

    "I've just received this relay and the first impression is good! It is heavy and feels like of a good build quality...." Read more

    "This feels like a good heavy solenoid, and so far work as expected...." Read more

    "Seems heavy enough to have the necessary components inside to do what it needs to do...." Read more

    12 customers mention7 positive5 negative

    Customers are mixed about the sturdiness of the auto accessory. Some mention it's well built and beefy, while others say that the flimsy plastic front broke while tightening the nut.

    "...It is heavy and feels like of a good build quality. Time will tell, if it will hold up to this first impression...." Read more

    "The plastic on the front broke when I was tightening the nut. The whole screw came out with the fractured plastic. Not very sturdy." Read more

    "...I use it as a power interrupt for my winch. No more runaways for me. Solid and well built unit, installs easily if you have any mechanical /..." Read more

    "The relay was dented and scratched up and the packaging inside the box was torn up like it was used. Paid for a new one I hope it still works" Read more

    9 customers mention6 positive3 negative

    Customers have mixed opinions about the ease of installation of the auto accessory. Some mention that it's easy to install and simple to wire, while others say that the design is questionable and the installation instructions are not very clear.

    "...No more runaways for me. Solid and well built unit, installs easily if you have any mechanical / electrical ability." Read more

    "...It was easy to install, following the included instructions, and has worked for my occasional use of the winch for a couple of years now." Read more

    "This product is a cheap,and comes with no instructions. The installation material is essentially a postcard with dangerously incorrect instructions...." Read more

    "Simple to install. Instructions are not very clear. It does not matter which lead goes to ground/remote...." Read more

    Very Good Battery Isolator!
    5 Stars
    Very Good Battery Isolator!
    I've just received this relay and the first impression is good! It is heavy and feels like of a good build quality. Time will tell, if it will hold up to this first impression.I have made some dry run tests and here is what I found out:1- Actuating the relay for more than 10min (without load) didn't show any signs of heating, the relay got barely warm.2- The description states that the relay "Draws Less Than 1-Amp When On", so I wanted to know how much less.I've connected the relay to a car battery sourced by a CTEK MXS 10, @14.32VDC the relay drew approximately 0.51 Amps,which is relative good and explains why it doesn't heat up noticeably.What could be better? I would have preferred, if the housing would have been made out of metal instead of plastic.This would add up to the rigidity of the relay and would be helpful to conduct the heat out of the relay under heavy load,especially if it is mounted in a place like the engine compartment. Bear in mind that this relay is designed to carry heavy loads,500 Amps continuous and 700 Amps inrush!The relay comes with a simple "manual" to illustrate how it could be connected in a dual battery system (as battery isolator). What is confusing, is that the "manual" states that "The relay will handle 500 amperes on a continuous basis at 12 VDC and "500 Amperes" in rush peak or surge"! So either this is a typo or someone was not sober as this line was written :) I hope that the item description @Amazon is correct and the relay can handle 700 Amps in rush, as this will be better, if the relay is going to be used to jump start an engine in case of an emergency.EDIT: 5 years later and still going strong!
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    Top reviews from the United States

    ThatGuyWithStuff
    5.0 out of 5 stars Durable - Lovin' This Thing!
    Reviewed in the United States on August 8, 2012
    Verified Purchase
    I have this installed in the OEM car jack location of my Nissan Titan along with 3  Scosche EWFH Single ANL Fuse Holder  and a  Brand New Kinetik Hc600 Power Cell Car Audio High Current Battery+ Best Service! . This thing had its ground and remote turn on leads shorted and kept on working. (This was due to my oversight, both wires got caught under my backseat mount, and were crushed and shorted by the weight of people sitting on the back seat). The remote turn-on lead going to this unit began smoking & melting, I quickly pulled it loose (burning my fingers). After re-routing and re-making the connections, this thing came right back and just worked. Basically a direct short did not kill this thing. That says a lot given the quality of most electronics you buy these days. I give it 5 stars. I may include some of my install pics when I get the time. I'm at work right now, and this is NOT the time! :-)  PAC PAC-500 500-Amp Battery Isolator Relay
    7 people found this helpful
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    Ala A.
    5.0 out of 5 stars Very Good Battery Isolator!
    Reviewed in the United States on March 31, 2016
    Verified Purchase
    I've just received this relay and the first impression is good! It is heavy and feels like of a good build quality. Time will tell, if it will hold up to this first impression.

    I have made some dry run tests and here is what I found out:

    1- Actuating the relay for more than 10min (without load) didn't show any signs of heating, the relay got barely warm.

    2- The description states that the relay "Draws Less Than 1-Amp When On", so I wanted to know how much less.
    I've connected the relay to a car battery sourced by a CTEK MXS 10, @14.32VDC the relay drew approximately 0.51 Amps,
    which is relative good and explains why it doesn't heat up noticeably.

    What could be better? I would have preferred, if the housing would have been made out of metal instead of plastic.
    This would add up to the rigidity of the relay and would be helpful to conduct the heat out of the relay under heavy load,
    especially if it is mounted in a place like the engine compartment. Bear in mind that this relay is designed to carry heavy loads,
    500 Amps continuous and 700 Amps inrush!

    The relay comes with a simple "manual" to illustrate how it could be connected in a dual battery system (as battery isolator). What is confusing, is that the "manual" states that "The relay will handle 500 amperes on a continuous basis at 12 VDC and "500 Amperes" in rush peak or surge"! So either this is a typo or someone was not sober as this line was written :) I hope that the item description @Amazon is correct and the relay can handle 700 Amps in rush, as this will be better, if the relay is going to be used to jump start an engine in case of an emergency.

    EDIT: 5 years later and still going strong!
    Customer image
    Ala A.
    5.0 out of 5 stars Very Good Battery Isolator!
    Reviewed in the United States on March 31, 2016
    I've just received this relay and the first impression is good! It is heavy and feels like of a good build quality. Time will tell, if it will hold up to this first impression.

    I have made some dry run tests and here is what I found out:

    1- Actuating the relay for more than 10min (without load) didn't show any signs of heating, the relay got barely warm.

    2- The description states that the relay "Draws Less Than 1-Amp When On", so I wanted to know how much less.
    I've connected the relay to a car battery sourced by a CTEK MXS 10, @14.32VDC the relay drew approximately 0.51 Amps,
    which is relative good and explains why it doesn't heat up noticeably.

    What could be better? I would have preferred, if the housing would have been made out of metal instead of plastic.
    This would add up to the rigidity of the relay and would be helpful to conduct the heat out of the relay under heavy load,
    especially if it is mounted in a place like the engine compartment. Bear in mind that this relay is designed to carry heavy loads,
    500 Amps continuous and 700 Amps inrush!

    The relay comes with a simple "manual" to illustrate how it could be connected in a dual battery system (as battery isolator). What is confusing, is that the "manual" states that "The relay will handle 500 amperes on a continuous basis at 12 VDC and "500 Amperes" in rush peak or surge"! So either this is a typo or someone was not sober as this line was written :) I hope that the item description @Amazon is correct and the relay can handle 700 Amps in rush, as this will be better, if the relay is going to be used to jump start an engine in case of an emergency.

    EDIT: 5 years later and still going strong!
    Images in this review
    Customer image Customer image Customer image Customer image
    Customer imageCustomer imageCustomer imageCustomer image
    14 people found this helpful
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    BigMikeSndTech
    4.0 out of 5 stars 500A continuous 500A surge not 750A surge, Other than that great solenoid and working perfectly for what I needed.
    Reviewed in the United States on August 22, 2015
    Verified Purchase
    This feels like a good heavy solenoid, and so far work as expected. I have it connected to my winch power line to shut off power headed out the front of the Jeep. The only thing I have noticed is that the product description has this labeled as a 500A continuous and 750A surge rated solenoid but the information provided in the box with the unit say that it is a 500A continuous and 500A surge. Shouldn't be a big deal for my application but due be aware the description may be wrong.
    6 people found this helpful
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    Kindle Customer
    5.0 out of 5 stars Great Battery Isolator, Fair price.
    Reviewed in the United States on April 15, 2024
    Verified Purchase
    I have a decent audio system in my truck
    280 amp mech man alt, large XS power battery under the hood, 0 guage power and ground everywhere, large XS Power batt in the rear. I put this Isolater under the hood to isolate the two batts when tbe truck is off and sits for long spells, this keeps tbe batts from cycling each other till they die and usually can't be revived... The only nit pick I have on it and every other brand is, I with there was some type of snap on cover to insulate the terminals from a short. With the amperage I run, that'd be a bad day...
    Helpful
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    Cody
    5.0 out of 5 stars Fixed voltage drop
    Reviewed in the United States on November 29, 2023
    Verified Purchase
    Put three separate batteries in my trunk for my audio system and it completely fixed light dimming. My car runs its own battery and the system runs it's three in the trunk.
    Helpful
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    Glenn Kelly
    5.0 out of 5 stars Solid, well built unit.
    Reviewed in the United States on May 16, 2019
    Verified Purchase
    Not many relays can hold the current this one can. I use it as a power interrupt for my winch. No more runaways for me. Solid and well built unit, installs easily if you have any mechanical / electrical ability.
    One person found this helpful
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    TechDr
    1.0 out of 5 stars Not very sturdy.
    Reviewed in the United States on May 23, 2017
    Verified Purchase
    The plastic on the front broke when I was tightening the nut. The whole screw came out with the fractured plastic. Not very sturdy.
    6 people found this helpful
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    BK
    5.0 out of 5 stars in perfect shape. Mounting is very secure
    Reviewed in the United States on September 6, 2017
    Verified Purchase
    A little pricey, not sure if it's exactly the same as others for a little less money, but from the pictures on Amazon, they look the same. Without handling and testing all versions , I can't tell.
    Since i've seen this model from PAC all over the place, figured, since I need to count on it, spent the extra scheckels.
    Arrived well boxed, in perfect shape.
    Mounting is very secure.
    I'm heavy handed, but based on another reviewer saying he cracked it when tightening a terminal nut, I was careful, and had zero issue.
    Was able to tighten all the connections with great satisfaction with out an issue or crack.
    Can hear the Click from in the jeep, can tell when it makes the closure or opens. So far so great as a power disconnect for my Zeon winch.
    One person found this helpful
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    Top reviews from other countries

    Translate all reviews to English
    Cliente de Amazon
    5.0 out of 5 stars La calidad del producto
    Reviewed in Mexico on November 5, 2021
    Verified Purchase
    Excelente producto lo recomiento al 100% Positivo
    Falta producto y la entrega debe ser mas rapida Negativo
    Report
    Chris
    5.0 out of 5 stars Used to isolate winch on jeep
    Reviewed in Canada on August 25, 2018
    Verified Purchase
    Works great as a relay on the main power line to a winch on my jeep. I didn’t want constant power over a #2 cable running to my front power, so I have a small switch inside the cab that turns the winch on and off now. At max draw the winch is 350amps and this works perfectly.
    Report
    RECASY 2018
    5.0 out of 5 stars excelente producto
    Reviewed in Mexico on March 17, 2021
    Verified Purchase
    excelente producto
    Report
    Tyler Debnam
    5.0 out of 5 stars 1 year under hood. Still going strong!
    Reviewed in Canada on March 4, 2019
    Verified Purchase
    I have this mounted high on the firewall under the hood. It experiences massive heat variances being used daily in our Canadian climate, but is still going strong 1 year in. Would recommend.
    One person found this helpful
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    Jayson
    5.0 out of 5 stars Good quality product
    Reviewed in Canada on July 6, 2019
    Verified Purchase
    Using as an isolator for the second battery in my truck for the past few months. Works fantastic.
    One person found this helpful
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