The ABB NTU/S 12.2000.1 (order code 2CDG110070R0011) is an uninterruptible 12 V DC / 2 A auxiliary power supply module for ABB i-bus® KNX power ecosystems. It maintains a buffered 12 V output for accessory loads when used as described in the ABB product manual — typically alongside UPS-oriented bus supplies such as SU/S30.640.2 and the related battery / charger accessories.

NTU/S is not a KNX twisted-pair bus power supply and must not be used to feed the KNX bus. For 30 V SELV bus current use SV/S30.640.5.1, SV/S30.640.3.1 or the SU/S UPS bus supply. For continuous (non-UPS) 24 V IP loads, prefer CP-D 24/2.5. Wire battery and load circuits only according to the NTU/S technical data and installation instructions.

The module mounts on a 35 mm DIN rail in an MDRC outline sized for power-supply panels (ABB dimensional literature uses an 8 MW class outline). Bridging time depends on the connected energy storage and load — size both from the ABB manual, not from rules of thumb.

Key Features — Auxiliary 12 V UPS

• 12 V / 2 A auxiliary UPS: Buffered DC for accessory loads in the KNX power ecosystem.
• Uninterruptible role: Continues the 12 V path during mains interruptions within ABB battery / configuration limits.
• Pairs with SU/S: Complements uninterruptible bus supplies rather than replacing them.
• MDRC installation: DIN-rail module for power-supply panels (8 MW class outline).
• Not a bus supply: Does not replace SV/S or SU/S for KNX TP 30 V current.

At a Glance

Specification	Detail
Product type	Uninterruptible auxiliary power supply, 12 V / 2 A
Order code	NTU/S12.2000.1 (2CDG110070R0011)
Rated output	12 V DC / 2 A
Role	Accessory UPS — not KNX 30 V bus supply
Typical pairing	SU/S 30.640.2 and related ABB battery / UPS accessories
Mounting	35 mm DIN rail, MDRC (8 MW class outline)
KNX ETS	Per ABB NTU/S documentation — not a bus current source

Battery rules, terminal assignments and bridging-time guidance are in the ABB product manual and installation instructions under Downloads.