Zener Barrier

Z896

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.

Asymmetrical Zener Barriers are for optimization of applications which have different voltage levels regarding to ground potential.

Depending on the application, increased or decreased intrinsic safety parameters apply for serial or parallel connection. For the detailed

parameters refer to the Zener Barrier certificate. Application examples can be found in the system description of the Zener Barriers.

Connection

3

1

6

8

2

7

4

5

Zone 2

Div. 2

Zone 0, 1, 2

Div. 1, 2

+

-

x3

x3

Technical Data

Search characteristics

Additional functions

Asymmetrical version

yes

General specifications

Type

DC version, negative polarity

Electrical specifications

Nominal resistance

terminals 1, 8: 320 Ω

terminals 4, 5: 415 Ω

Series resistance

terminals 1, 8: max. 340 Ω

terminals 4, 5: max. 437 Ω

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

pa-info@us.pepperl-fuchs.com

pa-info@sg.pepperl-fuchs.com

pa-info@de.pepperl-fuchs.com