Intelligent Segment Protector for FOUNDATION™ fieldbus, PROFIBUS-PA

The WSP300 offers spur protection against short circuits (between + and – terminals), limiting the short circuit current in each spur. During a short circuit situation there is no effect in the other spur or the main trunk. There is a LED to indicate short circuits and WSP300 has an integrated bus terminator in the models F and P.

In normal operation, each short circuit protector consumes less than 3 mA. After removing the short circuit, the spur goes back to normal operation, the protection circuit is disabled and the LED is dimmed.

Main characteristics
  • Intelligent Segment Protector for fieldbus installations in compliance with the IEC61158-2 standard (PROFIBUS PA and FOUNDATION™ fieldbus);
  • 4, 6 or 8 spurs;
  • Intelligent protection against short circuit in each spur, preventing the short circuit propagation. After removing the short circuit, the spur goes back to normal operation;
  • For panel mounting or field installation in junction boxes;
  • Integral part of JB400 – Intelligent Junction Box;
  • Quick and easy installation;
  • Maintenance during operation.

To better serve your application, the intelligent segment protector WSP300 is available in the following models:

  • F – For FOUNDATION™ fieldbus networks
  • P – For PROFIBUS PA networks

See separately their technical characteristics.


Physical layer

In compliance with IEC 61158-2

Power supply

Bus-powered 9 to 32 Vdc

Communication protocols


Maximum trunk current

2.5 A

Quiescent current per spur in normal operation

< 1 mA

Maximum current per spur during a short circuit

50 mA

Maximum voltage drop per spur


Number of spurs

4, 6 or 8

Spur connections

Removable 3-pin terminal blocks, 2.5 mm²

Surge protector at input

Cut in 62 V, 1500 W


Via DIN rail


100 Ω resistor and 1µF capacitor selectable by switch

Status LED

On (red): spur in short circuit condition;
Off: spur in normal operation



Operation Temperature

-20°C to 70°C


-40°C to 85°C


0-95% non-condensing



Dimensions (mm)

100x125x57 (WSP300-4)
150x125x57 (WSP300-6 e WSP300-8)

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