Technical Specifications

Main Features and Advantages

The Siemens 3RK1922-2BA00​ occupies a deceptively simple niche—”just a backplane”—but in the ET 200pro architecture it solves three problems that would otherwise require custom wiring and enclosure work.

Power + data on a single mechanical rail.​ Traditional motor-starter panels force you to run 400 V power separately from the control/data bus, doubling terminal count and creating points where a loose lug can take down an entire skid. The 3RK1922-2BA00​ integrates both paths into the ET 200pro rack’s backplane so that once the module is snapped in, every motor starter, MSM, and ASM 400 V disconnect that follows automatically inherits both 400 V feed-through and backplane data connectivity to the upstream IM interface module. This is why Siemens labels it a prerequisite: without the Siemens 3RK1922-2BA00, the rack is mechanically complete but electrically orphaned.

Tool-free snap-fit into the wide module rack.​ The 22.5 mm width aligns with Siemens’s standard ET 200pro rack pitch, and the 110 mm length matches the “short” bay option (versus 500/1000/2000 mm full rack extrusions). Installation is a DIN-rail-style slide-and-click—no screws into the backplane, no torque specs to chase. For maintenance crews doing a midnight swap of a failed motor starter island, the 3RK1922-2BA00​ drops in ahead of the active modules and instantly restores the bus without rewiring.

Finger-safe design matched to IEC 60529.​ Even though the module rides 400 V AC on the backplane pins, the front-panel touch zones comply with IEC 60529 finger-protection rules, and once enclosed in the ET 200pro rack’s IP65-rated profile, the whole assembly survives hose-down, coolant mist, and the kind of metal-dust environment that kills open-terminal panels. The 3RK1922-2BA00​ thus extends ET 200pro’s field-mount promise—motor control at the actuator, not in a distant MCC room—by keeping the 400 V backplane safely buried behind the rack face.

Thermal and geographic tolerance.​ Rated -25 °C to +55 °C ambient, the Siemens 3RK1922-2BA00​ covers unheated northern warehouses in winter and non-conditioned southern fab shops in summer without derating. 50/60 Hz dual-rate acceptance means the same spare travels between NA (60 Hz) and EU/APAC (50 Hz) plants without a spec change.

Ecosystem pairing.​ The 3RK1922-2BA00​ is the anchor point that lets the rest of the 3RK1 accessory chain plug in cleanly: the RS-232 cable 3RK1922-2BP00 for PG/PC commissioning, the USB cable 3RK1911-6EB00, and the handheld device 3RK1922-3BA00 for local motor-starter diagnostics all presume the backplane bus is present and terminated. Skipping the Siemens 3RK1922-2BA00​ to save a line item breaks all of those downstream accessories.

Application Field

The Siemens 3RK1922-2BA00​ is deployed wherever the ET 200pro motor-starter concept is used: distributed motor control mounted directly on the machine or conveyor rather than centralized in a main MCC. Its primary design brief is to bridge 400 V AC power and backplane data between the isolator module, ASM 400 V disconnect, and the hybrid motor starter units (direct-on-line, reversing, soft-start, or star-delta variants in the 3RK1 line) under the supervision of an ET 200pro IM 154-x interface module talking Profinet or Profibus to the higher-level PLC (typically S7-1500 or S7-1200).

In automotive body shops and powertrain lines, the Siemens 3RK1922-2BA00​ shows up on skid-mounted conveyor drives, lift-table motors, and shuttle-axis gearmotors where the motor starter must live on the moving structure itself. Here the IP65 capability of the assembled rack (with the 3RK1922-2BA00​ buried inside) matters—coolant spray, weld-cell humidity, and pneumatic condensate would corrode a conventional DIN-rail starter panel within a season. The backplane approach also means a single Profinet drop from the cell controller can address 8–12 motor starters across two backplane-bus segments without running individual motor cables back to a central cabinet.

In packaging and bottling lines, the 3RK1922-2BA00​ supports star-delta and soft-start 3RK1 motor starters driving conveyor merges, rotary tables, and case-erector drives. The ability to locally isolate via the MSM and ASM 400 V disconnect—both riding the same Siemens 3RK1922-2BA00​ backplane—lets line mechanics power-down a single motor segment for jam clearing without dropping the whole skid’s Profinet node, which keeps OEE loss localized.

In water/wastewater and bulk-material handling, the 3RK1922-2BA00​ anchors pump-motor starter islands mounted in IP65 enclosures on gantries or wet wells. The -25 °C low-end rating covers outdoor northern installs where the panel sees frost, and the 400 V / 50-60 Hz dual-rate means the same BOM works for a plant in Ontario and its sister site in Bavaria.

For retrofits, the Siemens 3RK1922-2BA00​ is often the missing piece when a team tries to reuse legacy 3RK1 motor starters in a new ET 200pro rack and finds the starters won’t enumerate on Profinet—the backplane bus was assumed to be integral and wasn’t ordered. Keeping a few 3RK1922-2BA00​ units on the local spare shelf prevents a “95 % built, 5 % stuck” commissioning stall.

Related Products

• 3RK1922-2BP00: RS-232 interface cable for ET 200pro motor starters, plugs into the commissioning port enabled by the 3RK1922-2BA00​ backplane; used with Motor Starter ES software on PG/PC.
• 3RK1922-3BA00: Handheld device for local operation/diagnostics of ET 200pro (and M200D) motor starters; requires the Siemens 3RK1922-2BA00​ backplane to access the motor-starter serial interface.
• 3RK1911-6EB00: USB interface cable (2.5 m) for PC-to-ET 200pro motor starter connection, companion to the backplane bus during commissioning.
• 6ES7194-4GB00-0AA0: ET 200pro wide module rack, 500 mm length—the host chassis into which the 3RK1922-2BA00​ snaps; also available in 1000 mm (4GD10) and 2000 mm (4GD20) variants.
• 6ES7194-4GD00-0AA0: ET 200pro wide compact module rack, 500 mm—alternative rack profile for tighter skid layouts, also hosts the Siemens 3RK1922-2BA00.
• 3RK1921-xxxxx series: ET 200pro motor starter hybrids (DOL, reversing, soft-start) that sit downstream of the 3RK1922-2BA00​ backplane—e.g., 3RK1921-0xx direct-on-line, 3RK1921-1xx reversing.
• 3RK1391-2xx: ASM 400 V disconnect module and 3RK1 MSM (maintenance switch module)—the two optional modules that, together with motor starters, form the typical load on a 3RK1922-2BA00​ backplane segment.