RBFU 1.05 ST Field Unit

RBFU 1.05 ST Field Unit

  • Field unit for 2 fire dampers
  • connects 2 fire dampers to the Bustec Ringbus
  • provides a plug connection for the Belimo BF24..-ST, BFG24..-ST and BLF24..-ST actuators
  • has a predefined address (no addressing required during system commissioning)
  • AC 230 V mains power
Category: .

Product Description

RBFU 1.05 ST Field Unit is used for controlling up to two Belimo 24 V fire damper actuators (BF24..-ST, BFG24..-ST, BLF24..-ST). The unit is connected to RingBus master controller via the 4 wire Ringbus communication. The Belimo ST actuators are equipped with connectors that are plugged directly in to RBFU 1.05 ST Field Unit. The actuators are isolated from mains by a transformer. Each unit has a predefined address and therefore has not to be addressed during the system commissioning. RBFU 1.05 ST unit is able to work without 230 V, but then it is only sending data about actuator position to the 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

24 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 1.05 ST Field Unit