Page last updated Oct 20, 2021 @ 10:03pm



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indoor version
door open
new style sensors outdoor version outdoor version
door open
wiring to switch with inlet box  wiring to switch without inlet box
Click thumbnail image above to enlarge

Watt Meter Box
2 Watt Meters for 7.5kW Total

Don't operate your backup or alternative power electrical system blind!  Install this economical wattmeter box so you can see what is happening.  Perfect for monitoring generator load when your transfer switch or panel does not have meters.

NEMA 1 enclosure for indoor mounting is 4" x 7" x 2-3/4" deep and comes with knockouts and hinged front cover.  Meters sense the power using current transformers (CTs) factory installed inside box.  Meter scales read in kW at 120VAC for each of two hot legs in a 120/240VAC 30 amp system.  Made in USA  

Also now available in outdoor version.

For maximum meter life we do not recommend direct mounting of enclosure on engine driven generators due to vibration.  Mount separately on an indoor wall.

Note that the old style product that had direct connect terminals was UL Listed.  However, the new style uses non-contact donut sensors.  Since it has no direct connection to the power system live conductors and operates at low voltage it is not UL Listed and does not have to be.

indoor version - limited availability
(Can ship late December 2021)
outdoor version

Item Number: MB75
Price: $62
Price last updated 6/21/2020
Shipping Weight: 2.5 lbs.




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