User Manual

9-6
Siemens Switzerland Ltd www.siemens.com/gamma 2019
Building Technologies Division
Modular ìnstallation system, Room Control Box
Overview and selection guides
Modular room control
Modular room control for UL/NEMA markets
The modular installation system is also available for installlation in standard 4“ x 4“ UL/NEMA junction boxes.
The full range of control devices comprises of a decentralized power supply, binary input, binary outputs (single, dual, triple), switching/dimming
actuators, solar protection actuators, and universal dimmer.
These devices can either be mounted inside a standard 4“ x 4“ junction box or attached to a standard 4“ x 4“ junction box.
The decentralized power supply unit JB 125/23 provides the system power necessary for the instabus KNX.
For each bus line, at least one decentralized power supply unit JB 125/23 is needed. The decentralized power supply provides 80 mA bus current.
Up to eight decentralized power supply units JB 125/23 may be attached in parallel to a single bus line providing a total bus current of 640 mA.
With the decentralized power supply independently operating control zones can be designed.
Placing the control devices close to the point of control allows for minimized wiring and thus significant installation cost reduction.
B1 4” x 4” Junction Box
B2 Device
B3 Bus terminal block for single core conductors
with 0.6…0.8 mm Ø
B4 1/2 inch screw nut
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