Kobold NBK-ATEX, Operating Instructions Manual

Page: 9 / 57

NBK-03 to -33 ATEX
NBK-03 to -33 ATEX K10/0322 page 9
7. Electrical Connection
7.1 Limit contacts NBK-RA
Attention!
Observe the allowed electrical ratings for the limit switch.
Maximum values
NBK-RA
ATEX-
contact
Switching capacity: 45 W/VA
Switching current: 0,6 A
Switching voltage: 230 V
AC/DC
Install the switch (if available) according to the diagram and connect it to the
electrical controller.
When switching inductive loads, such as contactors, relays, etc., electrical limit
values should not, also temporarily, be exceeded by e.g. voltage peaks. The use
of a contact protection relay is recommended to avoid overloading the reed
contacts.
Valid regulations for hazardous areas and regulations for installation (DIN/VDE
0165) should be observed when installing the NBK level indicator in zone 1 or 2
hazardous areas (no combustible liquids).
Note to NBK-RA:
Protect the circuit of the limit contact with a fuse. This fuse
must tolerate the permitted nominal current of the switching
contact and must have a deactivating ability according to the
possible short circuit current of the power system at the place
of installation. The contact is activated by the North Pole of a
magnet and deactivated by its South Pole.
NBK-RA
ATEX- contact
brown
blue
black