Zener Barrier

Z828.H.F

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

negative polarity, i. e. the cathodes of the zener diodes are grounded.

Additionally this Zener Barrier is equipped with a replaceable fuse. This high power version has a smaller serial resistance and therefore provides

higher voltage to the field device.

Connection

2

1

7

8

Zone 2

Div. 2

Zone 0, 1, 2

Div. 1, 2

+

-

x3

Technical Data

General specifications

Type

DC version, negative polarity

Electrical specifications

Nominal resistance

240 Ω

Series resistance

max. 273 Ω

Fuse rating

50 mA

Hazardous area connection

Connection

terminals 1, 2

Safe area connection

Connection

terminals 7, 8

1

Germany: +49 621 776 2222

Pepperl+Fuchs Group

Refer to "General Notes Relating to Pepperl+Fuchs Product Information".

USA: +1 330 486 0002

Singapore: +65 6779 9091

www.pepperl-fuchs.com

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