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NVX BIR200

200-Amp High Current Dual Battery Isolator and Relay for Car Audio Systems (Handles up to 300-Amp Surge)

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• 200-Amp continuous / 300-Amp surge
• Ideal for car stereo systems and mobile electronics
• Prevents the main starter battery from draining
• 10V to 16V DC operating range

Learn more about the bir200
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Universal – fits most vehicles.

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2026-07-27 11:08:20
List price $59.99
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-17%

$49.99

 with warranty
4 payments of $13

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NVX - Worth the Envy - Direct to Consumer Car Audio

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Product Highlights


• 200-Amp continuous / 300-Amp surge
• Ideal for car stereo systems and mobile electronics
• Prevents the main starter battery from draining
• 10V to 16V DC operating range

Description


NVX brand icon

Authorized dealer

Isolate with Confidence

The NXV BIR200 Isolator is the perfect solution when adding a secondary battery to your audio system. It allows the second battery to be fully dedicated to the sound system and does not create a voltage drop like common isolators tend to do. The isolator will draw less than 1-Amp when your vehicle is powered on. All of this will ensure that your battery will be isolated with confidence!

Lengthen the Life your Batteries

When two vehicle batteries are wired in parallel they have a tendency to charge and drain one another. Installing a relay that disconnects the batteries when the engine is off prevents excessive wear and lengthens the life of the batteries. Whenever you turn your engine back on, the batteries will be connected without any voltage drop to the second battery.

Product Details:

  • Used to isolate a second battery powering audio, video, navigation, or other equipment
  • Prevents a dead starting battery after listening to the stereo with the engine off
  • Capable of handling 200-Amp continuous and 300-Amp surge
  • The relay coil will operate safely between 10 and 16 Volts
  • Can be used to completely isolate equipment from power when the ignition is off
  • Dimensions: 2-3/8" W x 2-3/8" D x 3-3/4" H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

This item is currently not eligible for our low price guarantee. This may be due to supply constraints, manufacturer restrictions, or another reason. We're always here to help you get the best price possible so give us a call or email today. Our experts will do their best to build the system that works for you within the rules.

Frequently Asked Questions (FAQ)


Power handling. The BIR200 is built for high-output systems, supporting 200A continuous current. This makes it ideal for large amplifiers like NVX VAD and multi-battery setups that would melt or weld the contacts of a smaller 80A unit.
No. Unlike "Diode-style" isolators that drop about 0.7V, the BIR200 uses a high-current mechanical relay. This creates a direct connection, ensuring your secondary battery receives the full charging voltage from your alternator.
A click means the internal coil is moving, but the connection might be blocked. Check for 12V on both large studs while the engine is running. If one side is dead, you likely have a blown fuse or a loose high-gauge cable.
Connect the small Positive (+) terminal to a "Switched" 12V source (one that turns off with the key). This breaks the link between batteries when the car is off, ensuring your audio system doesn't accidentally drain your starter battery.
Yes, but keep it away from extreme heat sources like exhaust manifolds. To prevent corrosion and signal loss, ensure the Black ground wire is bolted to a clean, paint-free chassis point and use rubber boots to protect the large terminals.

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Specifications & Details


Battery Isolator Features
Compatible Amperage
200 amps
Surge Amperage
300 amps
Width
2-3/8"
Height
3-3/4"
Depth
2-3/8"
Isolator Type
Relay (Solenoid)
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

NVX

Model Number:

BIR200

Weight:

1.82lbs

Internal SKU:

bir200

Internal Product ID:

46582

Product and How-to Videos


Customer Ratings & Reviews


NVX BIR200 thumbnail image

5 star
82%
4 star
12%
3 star
6%
2 star
0%
1 star
0%



Durability
4.8
Value
5
Features
4.9
Design
4.9
Usability
4.9

Customer Photos & Videos


Customer Reviews

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it works as it should!

its a must have if you are running two batteries. i had mine installed by a certified installer and no more juice sucking from my starting battery. i have a hifonics brx 14001.d and two 15 inch kicker cvr (2010 model) with the kinetik hc600 battery and all is well,so get it and be done with worries about your car not being able to start!

By aaron on October 22, 2014

83 found this helpful


Nvx isolator

works good bought with a xs power battery install kit and works good and easy to install

By Brennen on December 6, 2014

82 found this helpful


nice power

this relay is what I need to run my stereo without loosing power it allows 2 battery's to run n charge specially now that s hot ac draws lots of current

By JORGE on April 9, 2013

79 found this helpful


good deal

Fast shipping. Product came in a well packed box.

By buickbasshead on October 12, 2014

66 found this helpful


Great Value

I use this relay to connect the chassis and coach batteries on my motorhome for charging and possible emergency start if a battery runs down.The old one with a different brand name failed in less than 2 years.I now have it wired to a toggle switch as it is not needed often since adding solar panels to my rv. The NVX BIR200 appears to be well built and functions perfectly. It energizes properly and shows no voltage drop across its contacts. Does what I need.

By Michael on November 9, 2017 Checkmark Icon Verified purchase

54 found this helpful


Just what I needed to solve 2problems

I would recommend this to anyone putting in an aftermarket system using the factory radio.

By Old bass head on September 12, 2020

47 found this helpful


Awesome deal!!! You know what you get with this one!

Good for systems that need a lot of extra bass power!

By Anonymous on October 20, 2018

46 found this helpful


Slightly overpriced

Works as it should. Wish the design was a bit better, in order to attach terminals easier, but that's the only thing available for the money. Otherwise, one would either have to take out a mortgage, sell a kidney or design their own.
This product did not exceed my expectations, thus, a three-star rating.

By Robert on January 22, 2020 Checkmark Icon Verified purchase

44 found this helpful


Good Quality

Nice weight to it and does what’s advertised. Nothing to complain about

By Austin on March 17, 2018

44 found this helpful


Works!, no issues.

Using to isolate a small battery that helps power my 1700watt amp.

By Branden on September 13, 2020

43 found this helpful



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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.