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The Reliance Controls 50-amp indoor wattage meter is available for purchase today.

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Reliance Controls 50-Amp Indoor Wattage Meter

(Based on expert analysis, manufacturer ratings and customer reviews)
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5
7 Reviews
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  • Features
  • Specs
  • 4
    Q&A 
  • 7
    Reviews
  • Articles
  • Shipping
  • Accessories
Monitor Generator Load
Measures up to 12,500 watts @ 125/250 volts

Indoor Installation
7" x 4" x 2.25" NEMA indoor cabinet
Product Specs
Voltage
120/240 Single-Phase
Frequency
60 Hertz
Rated Watts
12500 Watts
Rated Amps
50 @ 240 Volts (Single Phase) Amps
Enclosure
NEMA 1R
Maximum Wattage
12500 Watts
UL Listed
Yes
Overview
Made in USA
Yes
Weight
2.5 Pounds
Product Length
7 Inches
Product Width
4 Inches
Product Height
2.25 Inches
Consumer Warranty
2 Years
UPC
815181010355
Model
MB125
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  4 Questions
Q: My question is what size wire is run between the current transformers and the MB 125 watt meter? I want to install the watt meter in the garage next to my breaker panels. I read the manual and it mentions using 8 gauge wire, but don't see why that would be necessary since a current transformer is used.
by David Galliher from Florida on October 15, 2013

A: Thank you for your inquiry!

The MB125 is fitted with 20 AWG wires running from the current transformers to the meters themselves. Reliance Controls specifies an 8 AWG wiring requirement as this metering system is designed to monitor 50 amp loads. That 8 AWG wire would be the power conductor which is being metered, not the wires connected to the current transformer and meter.

It is important to understand that these current transformers are used for monitoring purposes and will not be transmitting any usable power.
by Jared, Product Expert
Q: This post is old. Have you ever received an answer if the Reliance MB125 watt meter's donuts can fit over 6 awg wire?
by Tom from Rhode Island on February 28, 2013

A: Yes, per the most recent QA I list that you can use #6 with this watt meter. It also says "if it will fit" which is meant as if you are using standard copper wiring. Some aluminum products have a larger diameter and will not fit.

by Jared, Product Expert
Q: The owner's manual states that you can not use wire over 8 AWG ? I have 6 AWG wire, will I still be able to use the Reliance MB125 watt meter?

by Michael Salonia from New Jersey on December 20, 2012

A: I have discussed this with Reliance Controls and they have said that you can use #6 as long as it fits in the coil (doughnut). They will be reviewing their installation instructions and will update when they get the opportunity.

by Jared, Product Expert
Q: Hi Jim,
I have a 7200 watt running/9000 watt peak 120/240 volt generator. I want to monitor both 120 volt legs at the same time. I dont need to monitor 240 volts at all. The reason for this is to balance the 2 poles. Got any suggestions?

by Jay Danielson from Idaho on April 12, 2011

A: A wattage meter only monitors one leg per meter. with model MB125 you wire one leg to one meter and the other leg to the other so you can keep the load balanced. You can view the installation manual on the site under the specs tab.

Owners Manual

by Jared, Product Expert
Reliance Controls MB125 Reviews & Ratings
Overall Rating
Features
4/5
Quality
4/5
Performance
4/5
Value
4/5
Overall
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5
Pros
Reliable (1)
Price (1)
Easy To Use (1)
Durable (1)
Cons
None (1)
100% of respondents would recommend this product to a friend
7 Reviews  Sort by 
 
Keith A.
Glenville, NY
Total Reviews
2 Reviews
REVIEWED
DEC.
07
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Wattage Meter Good But...
I received my wattage meter way ahead of the estimated delivery date of 1 1/2 months, and I was pleased at that. Overall I like the meter and its function- it works great.

My only issue, and it's minor but, the transformer leads are way too short for just about any installation. For example: next to my indoor/outdoor transfer switch enclosure. I used some extra probe cords from one of my hand-held electrical meter/tester that I had hanging around. They are somewhat flexible as the wattage... more
Was this review helpful?
50
George
Wallkill, NY
Purchased from Electric Generators Direct
Purchased 11/4/10
Total Reviews
2 Reviews
REVIEWED
NOV.
28
2010
4 out of 54 out of 54 out of 54 out of 54 out of 5
My Review
The generator works fine. The cover don't fit on the cabinet. I called two of your service dealers
and had no help. I installed four draw down hasps to hold it in place.

The mb125 reliance control only one meter works. I called them and they said one ct must be
bad. they were going to send me a replacement ct. that was ten days ago and I havenot
recieved it. Overall I am not to happy with it.
Was this review helpful?
50
George
Purchased from Electric Generators Direct
Purchased 11/14/12
Total Reviews
3 Reviews
REVIEWED
DEC.
06
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Prefer The Interlock Kit
I just received my Reliance Controls 50-amp watt meter, so I can't say how good it preforms yet. I am sure it will do its job.

I am installing this next to my main panel to monitor my portable generator, backfeeding my panel in the event of a power outage. Storms Irene and Sandy have prompted me to do this.

Each phase should be drawing the same amount of wattage, or as close as possible, for your generator to run as efficiently as it can. I also installed a generator interlock kit,... more
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73
Jerry W.
Irvington, AL
Purchased from Electric Generators Direct
Purchased 2/28/15
REVIEWED
MAR.
22
2015
5 out of 55 out of 55 out of 55 out of 55 out of 5
Mb125 Watt Meter
The meter works well as advertised.

That said, the input leads are entirely too short. My installation is through the wall and I had to splice extensions to get the length needed.

I did not pay close attention to the "Lower Limit" of the meter before I installed it.

The 50 Amp unit begins @ 1000 watts and the load I put on the generator doesn't register until a 240 unit kicks in like the water heater.
Jerry Recommends This Reliance Controls Product
Was this review helpful?
10
Cecil
Columbus, OH
Purchased from Electric Generators Direct
Purchased 10/31/12
Total Reviews
2 Reviews
REVIEWED
JAN.
03
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Mr. Farmer
I had to use the generator, less thank two weeks after install for back-up for barn power. It worked just as i wanted!!!
Was this review helpful?
22
Bryan
Annapolis, MD
Total Reviews
2 Reviews
REVIEWED
NOV.
09
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Tells Me What I Need To Know
I had my electrician put the MB125 between my inlet box and my circuit breaker. I now know how much voltage I am using and it saves me from over-working my generator.

I think this is a must-have when connecting to your load center.
Was this review helpful?
55
Thomas W.
Philadelphia, PA
Purchased from Electric Generators Direct
Purchased 11/2/12
REVIEWED
JUL.
08
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Reliance Controls 50-amp Indoor Wattage Meter Review
Pros: Durable, Easy To Use, Price, Reliable
Cons: None
Thomas Recommends This Reliance Controls Product
Was this review helpful?
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