OVR40150 datasheet(6/62 Pages) ABB

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Surge

otective

Devices

16.4

Low Voltage Products & Systems

1SXU000023C0202 Rev. A

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

Imc

Note:

Common mode

overvoltages affect

all grounding

systems.

SPD terminology

8/20 wave:

Current waveform which passes through equipment when

subjected to an overvoltage (low energy).

Type 2 surge protective device (SPD)

Permanently connected SPDs intended for installation on the load

side of the service equipment overcurrent device, including SPDs

located at a branch panel. It has successfully passed testing to

the standard with the 8/20 wave (class II test).

Metal oxide varistor (MOV)

A varistor is an electronic component with a “diode like” nonlinear

current-voltage characteristic, used to protect circuits against

excessive transient voltages. Most commonly composed of metal

oxides.

Maximum continuous operating voltage (MCOV, Uc)

The maximum designated root mean square (rms) value of power

frequency voltage that may be applied continuously between the

terminals of the SPD.

Nominal discharge current (In)

Peak current value of an 8/20 waveform which the SPD is rated

for based on the test program.

Maximum discharge current (Imax)

Peak current value of an 8/20 waveform which can be safely

discharged by the SPD, with an amplitude complying with the

class II operating test sequence. Imax > In

Short circuit current rating (SCCR)

Maximum symmetrical fault current, at rated voltage, that the

SPD can withstand without sustaining damage that exceeds

acceptable criteria or creates a hazardous operating condition.

Voltage protection rating (VPR)

The value of the VPR is determined as the nearest highest value,

taken from Table 63.1 of ANSI/UL 1449 3rd Edition, to the

measured limiting voltage determined during the transient voltage

surge suppression test using the combination wave generator at a

setting of 6kV, 3kA.

Voltage protection level (Up or Ures)

The voltage let through by the SPD while diverting surge current

to ground must not exceed the voltage withstand value of the

equipment connected downstream.

General information

Terminology of SPD electrical characteristics

Imd

Time (µs)

Residual Voltage

Shaved Peak

* Graph depicts an 8/20µs wave

Notes:

Test wave 8/20µs according to IEEE # C62.62-200/UL 1449

The first number corresponds to the time from 10% to 90% of its

peak value (8µs).

The second number corresponds to the time taken for the wave

to descend to 50% of its peak value (20µs).

Common mode and / or differential mode protection

Common mode

Common mode overvoltages appear between the live conductors

and ground, e.g. phase/ground or neutral/ground. A live

conductor not only refers to the phase conductors but also to the

neutral conductor.

This overvoltage mode destroys equipment connected to ground

(class I equipment) and also equipment not connected to ground

(class II equipment) which is located near a grounded mass and

which does not have sufficient electrical isolation (a few kilovolts).

Class II equipment not located near a grounded mass is

theoretically protected from this type of attack.

Differential mode

Differential mode overvoltages circulate between live conductors:

phase/phase or phase/neutral.

These overvoltages have a potentially high damaging effect for

all equipment connected to the electrical network, especially

‘sensitive’ equipment.

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