ABB TTF300 Note De Mise En Exploitation page 62

Electrical connections
4.5.6 Dust-explosion protection Zone 20
Transmitter design: ATEX II 1D IP 65 T135 °C
Fig. 15
A Sensor
B Transmitter TTF300
C Power supply
The electric circuit of the transmitter must be limited by an upstream fuse per IEC 127 with a
fuse current rating of 32 mA. This is not required if the power supply is in intrinsically safe "ia"
design.
26 - EN
Explosion-protection zone 20
J
A
E
B
D Fuse, 32 mA
E Interface for LC display
TTF300
Safety area
D
C
A00130
CI/TTF300-X1