NE12 datasheet(8/62 Pages) ABB

8 / 62 page

Surge

otective

Devices

16.6

Low Voltage Products & Systems

1SXU000023C0202 Rev. A

ABB Inc. • 888-385-1221 • www.abb.us/lowvoltage

The MLV will allow comparison of different types of SPDs with

regards to the let-through voltage. However, it is important to note

that the surge current used to measure the let-through voltage

is six times higher in the 3rd Edition than in the 2nd Edition. This

means that, comparing the obsolete SVR designation with the

new VPR ratings will not be valid, as VPR ratings will of course be

higher than SVR ratings.

The nominal discharge current: In

The nominal discharge current, known as In test, is new to

UL 1449, coming from the IEC standard.

During the test, the SPD is subjected to 15 impulses at the

selected nominal discharge current. In order to pass, the SPD

cannot create a shock or fire hazard during the test, and nothing

in the surge path can open during or after the test. The nominal

discharge current values, with a 8/20 µs wave shape, are selected

by the manufacturer as follows:

Type 1: 10 or 20 kA

Type 2: 3, 5, 10 or 20 kA

Type 1, Type 2 and Type 4 SPDs (intended for Type 1 or

Type 2 applications) are subjected to this test.

Sources: Underwriters Laboratories Inc., Standard for Safety, Surge Protective

Devices (UL 1449 Third Edition, 2011)

General information

Terminology of SPD electrical characteristics

NE12 データシート(PDF) 8 Page - ABB