Varistor Products

Revision: October 29, 2009

©2009 Littelfuse, Inc.

DA/DB Varistor Series

Industrial High Energy Terminal Varistors > DA/DB Series

Specifications are subject to change without notice.

Please refer to www.littelfuse.com/series/da or /db.html for current information.

DA/DB Varistor Series

Description

The DA and DB Series transient surge suppressors

are heavy-duty industrial Metal-Oxide Varistors

(MOVs) designed to provide surge protection for

motor controls and power supplies used in oil-

drilling, mining, and transportation equipment.

These UL recognized varistors have identical ratings

and specifications but differ in case construction

to provide flexibility in equipment designs.

DA Series devices feature rigid terminals to ensure

secure wire contacts. Both the DA and DB Series feature

improved creep and strike distance capability to minimize

breakdown along the package surface design that provides

complete electrical isolation of the disc subassembly.

See DA/DB Series Device Ratings and Specifications

table for part number and brand information.

Features

•

RoHS compliant

and Lead–free

•

High energy

absorption capability

W

•

Wide operating

voltage range

V

•

Screw terminals (DA

Series),quick connect

push-on connectors

(DB Series)

•

Case design provides

complete electrical

isolation of disc

subassembly

•

40mm diameter disc

•

No derating up to

85ºC ambient

Agency Approvals

Absolute Maximum Ratings

• For ratings of individual members of a series, see Device Ratings and Specifications chart

Agency

Agency File Number

E320116

CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This

is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational

sections of this specification is not implied.

Continuous

DA/DB Series

Units

Steady State Applied Voltage:

AC Voltage Range (V

130 to 750

V

DC Voltage Range (V

175 to 970

V

Transients:

Peak Pulse Current (I

For 8/20μs Current Wave (See Figure 2)

40,000

A

Single Pulse Energy Range

For 2ms Current Squarewave (W

270 to 1050

J

Operating Ambient Temperature Range (T

-55 to +85

ºC

Storage Temperature Range (T

-55 to +125

ºC

<0.01

%/ºC

Hi-Pot Encapsulation (COATING Isolation Voltage Capability)

(Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301)

5000

V

COATING Insulation Resistance

1000

MΩ

RoHS

DA SERIES

DB SERIES