Schneider Electric Class 615 dimensions Isolation, Function

Compact® NSF and NSJ 150 to 600 A Circuit Breakers

Section 13—Supplementary Technical Information

Isolation

Function Recognition and definition of the disconnection capacity for industrial low-voltage equipment:

Until recently, circuit breaker standards have established no regulations concerning the isolation function. Only the installation standards provided some rather vague information. The IEC 947 standard takes this function into account. In the "general regulations" section, it clearly states:

•The manufacturing regulation

•The tests to be performed

The circuit breaker standard should define the manner in which the tests are to be performed (under study). The manufacturing regulations state, for example:

•Both the isolation and the inner contact distances (open > 8 mm)

•A device indicating the true position of the contacts (operating handle if representative of the state of all the contacts)

•When a "locked" position is provided, this should only be possible with "open" contacts

The tests to be performed are as follow:

•Shock wave voltage strength (Uimp)

06153226	V			12.3 kV
	U
	0.9
	0.5				Uimp
	0.1
	0	t1	t2 1.2	50	tμs

1.2/50 μs–12.3 kV plus 25% between open contacts in comparison with devices not fitted with the applied isolation function according to the figure below. The test is validated if no triggering occurs between the contacts.

•Measurement of leakage current—under 110% of the device application voltage, maximum leakage currents proposed per pole:

—0.5 mA new device

—2 mA device after Ics

—6 mA device after Icu or after endurance tests, representative of the "end of service life."

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