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6 Safety sockets
Unless otherwise indicated in the technical data, the following color coding applies for supply and signal
connections on components of the Festo Didactic Automation and Technology Learning System.
Color
Meaning
Voltage greater than safety extra-low voltage
E.g. mains voltage of 90 to 400 V AC per
conductor
Mains conductor L1 (gray with brown ring)
Voltage greater than safety extra-low voltage
E.g. mains voltage of 90 to 400 V AC per
conductor
Mains conductor L2 (gray with black ring)
Voltage greater than safety extra-low voltage
E.g. mains voltage of 90 to 400 V AC per
conductor
Mains conductor L3 (gray with gray ring)
Voltage greater than safety extra-low voltage
E.g. mains voltage of 90 to 400 V AC per
conductor
Mains conductor (gray)
Neutral conductor
(gray-blue)
The component might not include all of the safety sockets shown above. Further safety
sockets may be included in the circuit setup due to the use of different components.
The specified protection classes and safe use will be achieved if safety laboratory cables supplied by Festo
Didactic are used.
The protective grounding terminal is designed as PE+ contact. This connection provides a low-impedance,
safe protective grounding conductor connection. The mechanically incompatible connection prevents a
connection error with a 4 mm safety laboratory cable.
The operating company bears the responsibility for any removal of this adapter. The adapter can be
unscrewed with a 1.5 mm Allen key. The locking mechanism is located in the drilled hole of the adapter.
Unscrew the screw in clockwise direction.
© Festo Didactic 8129446
403-1 System, Distributing Pro-Joining-Sorting Inline – Operating instructions
Color
Meaning
24 V DC
(red)
0 V DC
(blue)
Safety extra-low voltage,
signal input/output
(black)
Protective grounding conductor,
configuration as 4 mm safety socket
(green-yellow)
Protective grounding terminal as PE+ contact,
(green-yellow)
Ground connection, internally connected to
protective grounding conductor
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