Zener Barrier

Z705

Function

The Zener Barrier prevents the transfer of unacceptably high energy from the safe area into the hazardous area.

The zener diodes in the Zener Barrier are connected in the reverse direction. The breakdown voltage of the diodes is not exceeded in normal

operation. If this voltage is exceeded, due to a fault in the safe area, the diodes start to conduct, causing the fuse to blow. The Zener Barrier has a

positive polarity, i. e. the anodes of the zener diodes are grounded.

Connection

2

1

7

8

Zone 2

Div. 2

Zone 0, 1, 2

Div. 1, 2

+

-

x3

Technical Data

General specifications

Type

DC version, positive polarity

Electrical specifications

Nominal resistance

10 Ω

Series resistance

max. 18.18 Ω

Fuse rating

250 mA

Hazardous area connection

Connection

terminals 1, 2

Safe area connection

Connection

terminals 7, 8

Working voltage

1

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Pepperl+Fuchs Group

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