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The Reliance Controls 30-amp indoor wattage meter is available for purchase today.

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Reliance Controls 30-Amp Indoor Wattage Meter

(Based on expert analysis, manufacturer ratings and customer reviews)
4.4 out of 54.4 out of 54.4 out of 54.4 out of 54.4 out of 5
14 Reviews
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Monitor Generator Load
Measures up to 7,500 watts @ 125/250 volts

Indoor Installation
7" x 4" x 2.25" NEMA indoor cabinet


Model
  Model Number:MB75
 UPC:815181010317
 Manufacturer Name:Reliance Controls
 Made in USA:Yes
 Maximum Wattage:7,500 Watts
 Voltage:120/240 Single-Phase
 Frequency:60 Hertz
 Rated Amps:30 Amps
 Enclosure:NEMA 1R
 UL Listed:Yes
Overview
 Weight:2.5 Lbs. (1.13 kilograms)
 Dimensions:7"L x 4"W x 2.25"H
(17.78 x 10.16 x 5.72 cm)
 Warranty:2 Years
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  1 Question
Q: I am considering the Reliance MB75 or the RMK-15-I. I have recently installed a transfer switch and I am using a Generac GP 6500 generator. I would like to monitor the loads. The RMK-15-I installation appears very straightforward with the donuts going around the feeds. Are the feeds wired in series through the MB75? Would you have a picture of the interior of the cabinet or a schematic wire diagram?


by George from Wisconsin on February 13, 2011

A: The wiring for the MB75 goes directly into the unit where the connections are located. You can see the installation from the manual which we list on the website under the specs tab on the product page.

MB75 Product Page
by Mike, Product Expert
Reliance Controls MB75 Reviews & Ratings
Write Review
Overall Rating
Features
5/5
Quality
5/5
Performance
5/5
Value
5/5
Overall
4.4 out of 54.4 out of 54.4 out of 54.4 out of 54.4 out of 5
Pros
Easy To Use (3)
I'd Buy It Again (2)
High Quality (2)
Durable (2)
Reliable (1)
Cons
Expensive (1)
100% of respondents would recommend this product to a friend
14 Reviews  Sort by 
 
Bill
Purchased from Electric Generators Direct
Purchased 11/30/11
Most Helpful Positive Review
REVIEWED
DEC.
25
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Install Not Bad If You're Used To Doing Wiring
I installed this between the feed from the generator inlet and the breaker panel. I use a Generator Interlock Kit to prevent the possibility of back feeding the utility. Even though I only have a 5500w generator I wired everything to handle up to a 12kw generator. This meant #6 wire all the way through and a 50amp power inlet. I used an offset nipple between the meter box and the breaker panel and some Liquidtite flexible conduit out to the power inlet box. Made for a neat, clean and... more
Pros: Easy To Use, Durable, High Quality, I'd Buy It Again
Bill Recommends This Reliance Controls Product
Was this review helpful?
00
Edward G.
North Olmsted, OH
Purchased from Electric Generators Direct
Purchased 12/2/13
REVIEWED
DEC.
23
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Fast And Easy
Fast and easy to install. Works great!
Pros: Durable, Easy To Use, Reliable, High Quality
Cons: Expensive
Edward Recommends This Reliance Controls Product
Was this review helpful?
00
Michael P.
Kent, WA
Purchased from Electric Generators Direct
Purchased 9/26/13
Total Reviews
2 Reviews
REVIEWED
OCT.
17
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Well Worth Having
It was suggested by reps from Electric Generators Direct and well worth adding to my generator circuit.
Pros: Easy To Use, I'd Buy It Again
Michael Recommends This Reliance Controls Product
Was this review helpful?
01
Herb Kempin
Issaquah, WA
Purchased from Electric Generators Direct
Purchased 10/2/09
Total Reviews
2 Reviews
REVIEWED
OCT.
10
2009
4 out of 54 out of 54 out of 54 out of 54 out of 5
After Installation Immediate Impression - Great
Adding the Reliance (inductive) wattage meter in line with my new generator input feed to my main panel gives me visibility to load balance for optimal generator efficiency for my whole panel generator backup.

The meter was easy to install, was immediately confirmed to work with first generator test, and it looks to be well built and and a bargain.

After replacing my small 35 year old circuit panel with a new Siemens 4040 panel, I wanted to change from using a generator subpanel with... more
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20
Stephen
Purchased from Electric Generators Direct
Purchased 3/1/13
Total Reviews
2 Reviews
Total Helpful Votes
36 Helpful Votes
REVIEWED
MAR.
23
2013
4 out of 54 out of 54 out of 54 out of 54 out of 5
Small And Efficient Watt Meter
The Reliance MB75 is perfect for generators with total outputs up to about 7500 watts. In this model, each meter reads 3750 full scale, with each meter displaying current flow through each leg of a 240 Volt line. The meters are not of exceptional quality, but will probably serve their purpose if not dropped or mis-handled.

The meter is designed with two toriod current transformers on short leads connected to the meter terminals which use push on terminals. In most installations, you would... more
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71
Chris
Purchased from Electric Generators Direct
Purchased 12/14/12
REVIEWED
FEB.
10
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Watt Meter
I finally had a chance to test the watt meter. It performed as expected, very good. I was able to balance each leg of my generator feeds. And I knew exactly how much load was on my generator. I think this is a very good and useful tool to have.
Was this review helpful?
40
Doug
Danielsville, GA
REVIEWED
JUN.
13
2011
3 out of 53 out of 53 out of 53 out of 53 out of 5
Somewhat Disappointed
I recently installed a Briggs & Straton 8KW generator for emergency back-up during power outages. I also installed the Reliance 30 amp watt meter MB75 to monitor the watt load. I was pleased with with the meter except for the very short pick-up leads( only about 12 inches long) much too short to reach my generator leads. I had to splice an additional 12 inches into all 4 leads. The meter was not cheap. I don't understand why the leads were so short. I also installed the Reliance PowerBack... more
Was this review helpful?
51
James
Richmond, VA
Purchased from Electric Generators Direct
Purchased 8/31/11
REVIEWED
SEP.
23
2011
5 out of 55 out of 55 out of 55 out of 55 out of 5
The Great Balancing Act
My generator is an older model Honda an EM3500 that I have had for 9 or 10 years and it still performs like new. I purchased the MB75 meter to see how well I have been able to balance my electrical load over the years with such a small wattage generator 3500 watts and I was surprised that I had balanced my load to around 1000 to 1200 watts on each leg with normal running not appliance start-up. My generator is connected via manual transfer switch into the breaker box and I can run anything in... more
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30
Robert Barthel
Catonsville, MD
Purchased from Electric Generators Direct
Purchased 2/8/10
REVIEWED
MAR.
02
2010
4 out of 54 out of 54 out of 54 out of 54 out of 5
Wire Through The Knockouts
The meter uses nearly the entire depth of the box, so it's nearly impossible to wire it from top to bottom.

It works fine to wire it through the bottom and side knockouts.
Was this review helpful?
30
Mike P.
Jackson, NJ
Purchased from Electric Generators Direct
Purchased 7/11/12
REVIEWED
AUG.
22
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Mb75 - 30 Amp Indoor Wattage Meter
Knock outs on the side and back made for easy installation. Fast delivery-- I rate this as A+.
Was this review helpful?
20
Doug
Danielsville, GA
REVIEWED
JUN.
13
2011
3 out of 53 out of 53 out of 53 out of 53 out of 5
Somewhat Disappointed
I recently installed a Briggs & Straton 8KW generator for emergency back-up during power outages. I also installed the Reliance 30 amp watt meter MB75 to monitor the watt load. I was pleased with with the meter except for the very short pick-up leads( only about 12 inches long) much too short to reach my generator leads. I had to splice an additional 12 inches into all 4 leads. The meter was not cheap. I don't understand why the leads were so short. I also installed the Reliance PowerBack... more
Was this review helpful?
31
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