Reliance Controls 50-Amp Indoor Wattage Meter

Reliance Controls 50-Amp Indoor Wattage Meter
Model: MB125
(Based on expert analysis, manufacturer ratings and customer reviews)
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5
Number of Reviews (11)
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$69.99
In-Stock
Ships Monday, Sep 24th
In-Stock $69.99Buy Now
In-Stock
Ships Monday, Sep 24th
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  • Product Description
  • 11
    Reviews
  • 4
    Product Q&A
  • Recommended Accessories
  • How-To Articles
  • Manuals
Product Description
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Features
Features
  • Monitor Generator Load
  • Measures up to 12,500 watts @ 125/250 volts
  • Indoor Installation
  • 7" x 4" x 2.25" NEMA indoor cabinet
Specifications
Product Specs
Voltage
120/240 Single-Phase
Frequency
60 Hertz
Rated Watts
12500 Watts
Rated Amps
50 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
Features
Features
  • Monitor Generator Load
  • Measures up to 12,500 watts @ 125/250 volts
  • Indoor Installation
  • 7" x 4" x 2.25" NEMA indoor cabinet
Specifications
Product Specs
Voltage
120/240 Single-Phase
Frequency
60 Hertz
Rated Watts
12500 Watts
Rated Amps
50 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
Product Specs
+
Specifications
Product Specs
Voltage
120/240 Single-Phase
Frequency
60 Hertz
Rated Watts
12500 Watts
Rated Amps
50 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
Reviews
(11)
+
Reliance Controls MB125 Reviews & Ratings
100% of Reviewers Recommend This Product
Product Q&A
(4)
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Search Product Q&A's Answered by Jared, the Generator Expert
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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.
David Galliher 
from Florida 
October 15, 2013
Answer
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.
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This post is old. Have you ever received an answer if the Reliance MB125 watt meter's donuts can fit over 6 awg wire?
Tom  
from Rhode Island 
February 28, 2013
Answer
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.
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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?
Michael Salonia 
from New Jersey 
December 20, 2012
Answer
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.
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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?
Jay Danielson 
from Idaho 
April 12, 2011
Answer
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.

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