Wholesale price for XJM7-D Measuring Box (Power Lighting Energy Measuring Box) to Slovenia Importers
Exterior and dimensions
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XJM7-D measuring box (power lighting energy measurement box) is applicable to power, lighting measurement management with AC 50HZ, rated voltage 380 / 220V, three-phase four-wire. The advantages includes large capacity, shunt output switch can be selected by design, measures against stealing.It is can be called flexible, mobile, reliable power distribution equipment.
In line with GB7251.1-1997 and GB7251.3-1997 standards.
A test set up and visualize what happens when a rewireable fuse, MCB (miniature circuit breaker) or no fuse is fitted in an electrical circuit.
Wire of 2.5mm² is used which is normally rated for 16 or 20 Amp power circuits in 240 Volts systems, depending how long the runs are.
First test after the intro is a rewireable 15 Amp fuse which pops.
Second test after the intro is with a 16 and a 32 Amp MCB which trip almost immediately.
Then the protective device is bypassed and a 300 Ampere current is flowing making the 2.5 mm² wire acting as a fuse itself.
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