Zener Barrier

Z978

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

alternating polarities, i. e. interconnected zener diodes are employed and one side is grounded. The Zener Barrier can be used for both alternating

voltage signals and direct voltage signals.

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

x3

x3

x3

Zone 0, 1, 2

Div. 1, 2

+

-

Technical Data

General specifications

Type

AC version

Electrical specifications

Nominal resistance

600 Ω

Series resistance

max. 646 Ω

Fuse rating

50 mA

Hazardous area connection

Connection

terminals 1, 2; 3, 4

Safe area connection

Connection

terminals 5, 6; 7, 8

1

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