Stahl 8549/1, Руководство по эксплуатации, Страница: 30 / 52

Intended Field of Application
4
168779 / 854960300010
2011-09-23·BA00·III·en·02
Load and Motor Switch, Load-Break
Switch 8549/1
3.3 Conformity to Standards
The relevant standards are listed in the EC Declaration of Conformity.
4 Intended Field of Application
The load and motor switch 8549/1 is an explosion-protected electrical device in a
flameproof enclosure. It is used for the separation or activation of electrical circuits in
hazardous areas of Zone 1, Zone 2 or in the safe area.
For installation in hazardous areas, the load and motor switch must be fitted into an

enclosure of the ignition protection type "increased safety" or into an enclosure which

corresponds to the requirements according to IEC/EN 60079-0.
Design and function
The load and motor switch 8549/1 is available in the versions 8549/1-3. (3 poles) and
8549/1-4. (3 poles + N).
To reach a switch with 6 poles, two switches with 3 poles can be connected by means of
a parallel drive.
The switches are actuated by means of an actuator insert which is connected to the

switch by means of a selector shaft.
The actuator insert is fitted into the wall or into the cover of the enclosure and can be
equipped with an optional cover lock.
For the installation of the switch in enclosures of different height, selector shafts of

different lengths can be used.
Mains connection
The mains connection can be established in the following ways:
Auxiliary contacts
Up to two certified contact elements of the Type 8080/1 can be mounted to the load and
motor switch 8549/1.
The switching function of the contact elements is defined by the contact version and their
position in the load and motor switch (left-hand: delayed (ON), advanced (OFF);

right-hand: synchronising).
35 ... 150 mm
2
: Cable connection to main terminal
2 x 150 mm
2

(cable lug):
Cable connection to main terminal using a clamping plate and
an insertion prism
6 ... 10 mm
2
: Cable connection to main terminal using an additional insertion
prism
0.5 ... 10 mm
2
: Cable connection using alligator clip