Application Conditions For The Units; Special Conditions; Short-Circuit Protection - Burkert PTB 03 ATEX 1030 X Instructions De Service

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APPLICATION CONDITIONS FOR THE UNITS

2.1 Special conditions

2.1.1 Short-circuit protection

As a short-circuit protection, each magnet must be connected in series
with a fuse corresponding to its rated current (max. 3 x I
60127-2-1) or a motor protector switch with a fast-acting short-circuit and
thermal trip (set to the rated current). For very small rated currents for the
magnets, the fuse with the smallest current value according to the abo-
ve-mentioned IEC standard will suffice. This fuse may be mounted in the
associated supply unit or must be connected in series separately. The rated
voltage of the fuse must be equal to or larger than the quoted nominal vol-
tage of the magnet. The switch-off capability of the fuse cartridge must be
equal to or greater than the maximum theoretical short-circuit current at the
installation location (normally 1500 A).
In the case of versions A and L of the solenoid, short-circuit protection must
be assured by the operator. In the case of version K of the solenoid, the fuse
is installed in the terminal box of the device. More detailed descriptions of
versions A, L and K are to be found in the section Technical Data.
2.1.2 Operation with associated valve body
The solenoid coils Type 77. / 78. may only be operated with a valve body
satisfying the following requirements.
For the valve body, the following materials may be used:
• metal (brass, aluminium, stainless steel)
or plastics (e,g, polyamide PA 6 GV ...)
b
Fuse ... A
03 ATEX 1030 X - 11
according to IEC