Circuit Protection

System

Page:3

Specifications are subject to change without notice.

Metal Oxide Varistors - 40D Series

Packaging

Part Number

Component

Package

Quantity

Packaging

Option

Packaging Specification

40D

40.0

100

BOX

200PCS

Current Energy and Power Dissipation Ratings

Should transients occur in rapid succession, the average power dissipation is the energy (watt-seconds) per pulse times

the number of pulses per second. The power so developed must be within the specifications shown on the Device Ratings

and Specifications Table for the specific device. The operating values of a MOV need to be derated at high temperatures as

shown above. Because varistors only dissipate a relatively small amount of average power they are not suitable for repetitive

applications that involve substantial amounts of average power dissipation.

100

90

50

10

T

TIME

0

1

T

1

T

2

Example

µs Current Waveform:

8µ

1

20µ

2

100

90

80

70

60

50

40

30

20

10

0

-555060708090100

110120

130140 150

Figure 1A - Power Derating for Epoxy Coated

Figure 2

100

90

80

70

60

50

40

30

20

10

0

-555060708090100

110120

130140 150

Figure 1B - Power Derating for Pholenic Coated

Peak Pulse Current Test Waveform