RBFU 2.01 ST Field Unit

RBFU 2.01 ST Field Unit

  • Field unit for 1 smoke control damper
  • connects 1 smoke control damper to the Bustec Ringbus
  • provides a plug connection for the Belimo BE24..-ST and BLE24-ST actuators
  • has a predefined address (no addressing required during system commissioning)
  • AC 230 V mains power
Category: .

Product Description

RBFU 2.01 ST Field Unit is used for controlling one Belimo 24V smoke control damper actuator (BE24..-ST, BLE24-ST). The unit is connected to the Ringbus master controller via a 4 wire ring bus communication. The Belimo ST actuators are equipped with plug connectors that can be plugged directly into RBFU 2.01 ST unit. The actuator is isolated from mains by a transformer. Each unit has a predefined address and therefore has not to be addressed during the system commissioning. RBFU 2.01 ST unit is able to work without 230 V, but then it is only sending data about actuator position to Ringbus master controller and is not able to turn on/off the actuators.

Additional Information

Electrical data


Nominal voltage

AC 230 V 50/60 Hz

Nominal voltage range

AC 100 … 230 V

For wire sizing

18 VA

Power consumption from mains

Actuator consumption + 300 mW

Power consumption from bus

5 mW


Power supply terminal 2 x 3 x max. 2.5 mm² (min. 0.5 mm²)
Actuator outputs Plug, 6 poles
Actuator power supply Plug, 3 poles
2 x RingBus terminal 4 x 1.5 mm² wire



Protection class

Class II (all insulated)

Degree of protection



CE according to 2004/108/EC


CE according to 2006/95/EC

Ambient humidity range

IEC 60730-1 max. 95 %

Ambient temperature range

–20 … +60°C

Non-operating temperature

–40 … +85°C





400 g
154 × 114 × 77 mm


Technical Data Sheet for RBFU 2.01 ST Field Unit