7
GB
Explosion-protected safety switch 10A,
GHG 261
4
Field of application
The safety switches GHG 261 are intended for
use in potentially explosive atmospheres in
Zones 1 and 2 as well as in Zones 21 and 22 in
accordance with IEC/EN 60079-10-1 and
IEC/EN 60079-10-2.
The enclosure materials used, including any
external metal parts, are high quality materials
that ensure a corrosion resistance and
resistance to chemical substances according to
the requirements for use in a ”normal industrial
atmosphere”:
– impact resistant polyamide
– special steel AISI 316 L.
For use in an extremely aggressive atmos-
phere, please contact your Cooper Crouse-
Hinds agent for additional information on the
chemical stability of the plastics used.
5 Application / Properties
The safety switches are designed for the safe
isolation of the electrical energy at all poles
while maintenance, cleaning and repair work is
being carried out on equipment, machinery and
drives in potentially explosive atmospheres.
See technical data, page 6, for the temperature
class, explosion group and permissible ambient
temperature.
Due to the AC 3 motor switching capacity
of the safety switches, reliable isolation
(switching) is also possible during operation.
In addition to this, the safety switches are so
designed, that they also switch off the drive,
e.g. via the contactor that precedes the
auxiliary contact. In relation to the main
contacts, this auxiliary contact is lagging while
making and leading while breaking.
Versions with gold-tipped auxiliary contacts are
suited for switching extra-low voltage circuits.
Special attention shall be paid to the maximum
current load (see technical data, page 6). The
contact chamber of the gold-tipped version is
marked with the letter ”G” or colour-coded.
Due to the mechanical design of the safety
switch, compulsory opening of the contacts is
possible.
The safety switches fulfil the isolating
properties according to IEC/EN 60947-3.
The ”EMERGENCY-STOP“ version conforms to
the requirements of IEC/EN 60204-1.
To prevent unauthorized switching, the
switches can be locked in the ”OFF“ position
by means of 3 padlocks, see fig. 1, (shackle
diameter of the padlocks up to 4 to 6 mm).
A built-in locking device prevents the opening
of the enclosure in the ”OFF“ position.
The data according to sections 3 and 4 shall
be taken into account during use.
Applications other than those described are
not permissible without a written declara-
tion of consent from Messrs. COOPER
Crouse-Hinds.
During operation the instructions stated in
section 7 of the operating instructions shall
be observed.
The sole responsibility with respect to the
suitability and proper use of the control
switches with regard to the basic require-
ments of these instructions (see technical
data) lies with the operator.
6 Installation
The relevant national regulations(e.g. Elex V, the
equipment safety law for Germany) and the
generally recognized rules of engineering apply
for the installation and operation
(IEC/EN 60079-14).
The improper installation and operation of
safety switches may result in the invalida-
tion of the guarantee.
6.1 Mounting
Before mounting the safety switch, the cover
has to be removed from the enclosure base.
For this, the switch has to be set to the ”ON“
position.
When the safety switches are mounted directly
onto the wall, they shall rest evenly only on the
fastening points provided for this purpose.
The screw chosen shall fit the fixing hole (see
dimensional drawings, page 6) and shall not
damage the hole (e.g. use of a washer).
The apparatus shall be fixed diagonally with a
minimum of 2 screws.
If the screws are overtightened, the
apparatus may be damaged.
The safety switches GHG 261 are suited for
mounting on CEAG apparatus holders size 1 by
means of self-cutting screws (see fig. 2).
See the respective mounting instructions.
6.2 Opening apparatus /
Electrical connection
The electrical connection of the apparatus
may only be carried out by specialists
(IEC/EN 60079-14).
Before opening the apparatus, ensure that it
has been isolated from the voltage supply
or to take suitable protective measures.
Before opening, set the switch to the ”ON“
position.
C
C
Fig. 1
Apparatus holder size 1
for wall and trellis fixing
Apparatus holder size 1 for pipe fixing
C = screw fixing points for safety switch
GHG 261, 10A
Fig. 2
Wiring diagram
Fig. 3
