6
Operating instructions
Safety switch
EX-AZ 3550
EN
1.6 Warning about misuse
In case of improper use or manipulation of the safety switch-
gear, personal hazards or damages to machinery or plant
components cannot be excluded when safety switchgear is
used. The relevant requirements of the standard ISO 14119
must be observed.
1.7 Exclusion of liability
We shall accept no liability for damages and malfunctions resulting from
defective mounting or failure to comply with this operating instructions
manual. The manufacturer shall accept no liability for damages resul-
ting from the use of unauthorised spare parts or accessories.
For safety reasons, invasive work on the device as well as arbitrary re-
pairs, conversions and modifications to the device are strictly forbidden;
the manufacturer shall accept no liability for damages resulting from
such invasive work, arbitrary repairs, conversions and/or modifications
to the device.
2. Product description
2.1 Ordering code
This operating instructions manual applies to the following types:
EX-AZ 3350-
➀
-
➁
-3D
No.
Option
Description
➀
03-ZK
3 NC
12-ZUEK
1 NO contacts / 2 NC contacts
➁
1637
Gold-plated contacts
Only if the information described in this operating instruc-
tions manual are realised correctly, the safety function and
therefore the compliance with the Machinery Directive and
the Explosion Protection Directive is maintained.
2.2 Special versions
For special versions, which are not listed in the order code below 2.1,
these specifications apply accordingly, provided that they correspond to
the standard version.
2.3 Destination and use
The safety switches are suitable for sliding, hinged and removable sa-
fety guards, which need to be closed in order to ensure the necessary
operational safety.
The components can be used in explosion-endangered areas of Zone
22 equipment category 3D. The installation and maintenance require-
ments to the standard series EN 60079 must be met.
The user must evaluate and design the safety chain in ac-
cordance with the relevant standards and the required safety
level.
Conditions for safe operation
Due to their specific impact energy, the components must be fitted with
a protection against mechanical stresses. The specific ambient tempe-
rature range must be observed.
2.4 Technical data
Equipment category:
L
II 3D
Ex protection:
Ex tc IIIC T90°C Dc X
Standards:
IEC 60947-5-1, EN 60079-0,
EN 60079-31, BG-GS-ET-15
Enclosure:
light-alloy diecast, paint finish
Actuator:
VA
Design:
EN 50041
Max. impact energy:
4 J
Actuating speed:
max. 1 ms
Switching frequency:
1200 / h
Protection class:
IP67 to IEC 60529
Contact material:
Silver
Contact type:
change-over with double break Zb,
or 3 NC contacts, galvanically separated contact bridges
Switching system:
A
IEC 60947-5-1; slow action,
NC contact with positive break
Connection:
screw terminals
Cable section:
min. 0.75 mm², max. 2.5 mm²
(including conductor ferrules)
Cable entry:
M20 x 1.5
Rated impulse withstand voltage U
imp
:
4 kV
Rated insulation voltage U
i
:
250 V
Thermal test current I
the
:
10 A
Utilisation category:
AC-15 / DC-13
Rated operating current/voltage I
e
/U
e
:
4 A / 230 VAC
4 A / 24 VDC
Max. fuse rating:
6 A gG D-fuse
Positive break travel:
10.7 mm
Positive break force:
each NC contact 5 N
Ambient temperature:
− 10°C … + 60°C
Mechanical life:
> 1 million operations
Cable cross-section of the cable glands:
min. Ø 7 mm;
max. Ø 12 mm;
L
II 2GD
Tightening torque:
Cable gland: min.1.0 Nm
Cover screws: min. 8 Nm
2.5 Safety classification
Standards:
ISO 13849-1
B
10d
(NC contact):
2.000.000
B
10d
(NO contact)
at 10% ohmic contact load:
1,000,000
Service life:
20 years
MTTF
B
d
x
x
h
s/h
3600
d
10d
op
op
op
n
0,1 x n
op
t
cycle
(Specifications can vary depending on the application-specific parame-
ters h
op
, d
op
, t
cycle
as well as the load.)
mrl_ex-az3350_en.indd 6
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