Installation
8
8537608300
S-BA-8537/2/5-02-en-12/10/2007
Safety switch
8537/2, 8537/5
8
Installation
8.1 Mains Connection
X
Fit the end covering sleeves gas-tight and using a suitable tool.
X
Be especially careful when connecting the cable.
X
The conductor insulation must reach to the terminal.
X
The conductor itself must not be damaged when removing the insulation.
X
Select the cables and the mode of running them in a way that the maximum permitted
cable temperature is not exceeded.
X
Always connect the earth lead.
X
Observe the tightening torque of the terminals:
8.2 Back-Up Fuse
X
Provide suitable back-up fuses, see chapter 5 "Technical Data".
8.3 Back-Up Fuses for Auxiliary Circuits
X
As a general rule, auxiliary circuits must be protected by a 10 A gL fuse.
8.4 Intrinsically Safe Circuits "I"
X
Use only isolated cables and conductors whose testing voltage is AC 500V and whose
minimum quality is HO5 in intrinsically safe circuits.
X
The diameter of one conductor must not be smaller than 0.1 mm; this applies also to
the individual wires of finely stranded conductors.
X
EEx i - electric circuits are connected to blue terminal blocks.
X
The consumers must be protected against overload independently of it.
WARNING
Incorrectly installed components!
Z
Explosion protection cannot be guaranteed any more if the components
are incorrectly installed.
X
Carry out the installation in strict accordance with the instructions and
national safety and accident prevention regulations (e.g. EN 60079-14).
Version
Tightening torques of the terminals
12 A, 16 A, 25 A
1.8 Nm
40 A, 63 A, 80 A
3.8 Nm
125 A, 160 A
10 - 20 Nm
WARNING
Short-circuit in the main circuit
Z
Contacts may be damaged.
X
Replace the switch after each short circuit in the main circuit (the element
is hermetically sealed and the state of the switching contacts cannot be
checked).
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