The ABB SU/S 30.640.2 (order code 2CDG110275R0011) is an uninterruptible 640 mA KNX power supply with integrated choke. In normal operation it supplies the twisted-pair bus like a standard 640 mA PSU; on mains failure it maintains the bus from connected 12 V sealed lead-acid batteries so critical KNX traffic can continue for the bridging time set by battery capacity and load.

Battery options follow ABB rules: external 12 V SLA batteries (up to two in parallel, same capacity, typically in the 1 Ah … 2 × 17 Ah range) or the documented ABB battery-module path. Nominal charging current is typically 600 mA (or 150 mA with the AM/S12 battery-module path). Always size batteries and cable for the required backup time and observe ABB polarity / fuse guidance.

Commission with the dedicated SU/S 30.640.2 ETS application. Housing width is 8 MW (approx. 90 × 140 × 63.5 mm, net weight ≈ 0.4 kg). Related products: NTU/S12.2000.1 for auxiliary 12 V UPS needs in the ABB power ecosystem; SV/S30.640.5.1 when you need diagnostic non-UPS 640 mA bus supply without battery backup.

Key Features — Uninterruptible Bus Supply

• 640 mA KNX output: Bus supply with integrated choke, short-circuit proof per ABB design.
• Battery backup: Continues SELV bus voltage on mains failure when batteries are connected correctly.
• Flexible battery sizing: Parallel SLA packs or ABB module path — charging current depends on configuration.
• ETS diagnostics: Product-specific application for status and UPS-related parameters.
• 8 MW MDRC: Larger Pro M housing for UPS electronics, mains and battery connections.
• Not for device 24 V: This is a 30 V KNX bus PSU — use CP-D 24/2.5 for auxiliary 24 V IP loads.

At a Glance

Specification	Detail
Product type	Uninterruptible KNX Power Supply, 640 mA, MDRC
Order code	SU/S30.640.2 (2CDG110275R0011)
Rated bus current	640 mA
Bus voltage	30 V DC (21…31 V DC operating range)
Battery	12 V SLA; max. 2 in parallel (same capacity)
Charging current (typical)	600 mA (or 150 mA with AM/S12 path)
Width / weight	8 MW; approx. 0.398 kg

Battery capacity, bridging time and wiring details are in the ABB product manual and technical data under Downloads. Installation by a qualified electrician only.