China Manufacturer for XJM7-W Measuring Box (Outdoor Energy Measuring Box) for Moscow Factories


Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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XJM7-K measuring cabinet (outdoor street lamp measurement control box) is suitable in power supply line with AC 50HZ, rated insulation voltage 660V, rated voltage 380/220v, as energy measurement equipment of residential quarters, villas energy measurement etc.

In line with GB7251.1-1997 and GB7251.3-1997 standards.

3C certificate:


Important Notice:
Thanks to Youtube users Mark Horstmeier and ramosel I now doubt my own explanation in the video. Please read for a better operational theory.

Ball Bearing Motor

The parts:
(None of the dimensions is critical. Material doesn’t matter as long as it conducts electricity.)
3 M6 stainless Nuts, 1 M6 stainless Bolt (50mm long) , 2 Ball Bearings (OD: 20mm, ID: 6mm, Width:6mm, seals removed, grease removed with brake cleaner), 2 flexible isolated wires (Diameter 1.5mm, Length 20cm) Wires are soft soldered to outer races of the bearings.

The power supply: Old 12V Battery charger with conventional transformer.
Batteries must not be used (current way too high!!) Modern (eg. computer) power supplies are unlikely to work, as they switch off totally when short circuits are made.

Kids! Don’t do this at home! Danger of burns, fire and electric shock.

Be sure you have a residual-current circuit breaker (RCCB) installed. Never use mains electricity directly.

Here’s an explanation of the thermal theory (which I doubt after reading Kirk T. McDonald’s paper):

Please look at this article which also presents different explanations of how it works:

GE AKD-20 low-voltage switchgear continues the AKD tradition while delivering enhanced arc flash protection. With the EntelliGuard G circut breaker it can offer new options that include an arc flash maintenance switch (RELT), remote racking device, insulated & isolated bus, and non-vented panels.

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