Description
The 3RX9306-1AA00 is Siemens’ AS-Interface combi-power supply unit—a DIN-rail mounted, primary-switched PSU that combines a 30 V DC / 4 A AS-i bus supply with an integrated data-decoupling stage delivering 24 V DC / 5 A auxiliary power, all behind a single 115/230 V AC reconnectable input. Designed for control cabinets where space is tight and AS-i master + peripheral loads share the same rack, this “combi” form factor collapses what used to be two separate supplies (AS-i PSU + 24 V aux) into one 150 mm wide housing, with built-in electronic short-circuit protection that isolates a faulty branch without collapsing the whole bus.
h2 Application Scenarios
On a BMW body-shop conveyor cell running ~48 AS-i addressable sensors (inductive proximity + optical fork) and 14 AS-i valve-manifold slaves across three sub-segments, the original design had used a standalone 30 V AS-i PSU plus a separate 24 V SITOP to power the valve coils and the AS-i master’s auxiliary draw. During a Friday night retool, the panel builder realized the spare 24 V slot had been spec’d out—no room left. The fix was a direct swap to the 3RX9306-1AA00: 30 V/4 A feeds the yellow AS-i flat cable (62-address headroom, easily covering the 48 active nodes), and the 24 V/5 A decoupling output picks up the valve coils and the master’s primary-clock load, all from one DIN footprint. Commissioning took 40 minutes—mostly re-terminating the 115/230 V selector to the plant’s 230 V standard. Six months later, the cell saw its first AS-i branch short (fork-sensor lead nicked by a trolley bolt). The 3RX9306-1AA00‘s electronic limiter clamped the faulty segment, the rest of the bus stayed alive, and the AS-i master reported “Slave 31 short” in Diagnostics—maintenance walked straight to the fault, no blind hunting. For the panel builder, the lesson landed: “Combi” isn’t a marketing word here—it’s one less device to stock, one less terminal row to wire, and one less single-point failure on the aux rail.
h2 Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 3RX9306-1AA00 |
| Manufacturer | Siemens AG |
| Product Category | AS-Interface Combi-Power Supply |
| AS-i Output | 30 V DC, 4 A (powers AS-i bus + up to 62 std slaves) |
| Decoupling (Aux) Output | 24 V DC, 5 A (primary clocking / valve & sensor aux load) |
| Input Voltage | 115 V AC / 230 V AC single-phase, reconnectable via slider |
| Input Range | 102–132 V AC @115 V / 195–253 V AC @230 V, 50/60 Hz |
| Protection | Electronic short-circuit, auto-recovery; IP20 (cabinet internal) |
| Built-In Decoupling | Integrated (no external decoupling capacitor required) |
| Mounting | 35 mm DIN rail (EN 50 022), screw-terminal (cage clamp) |
| Dimensions (W×H×D) | 150 × 135 × 107 mm |
| Operating Temp. | -45 °C to +55 °C (storage -45 °C to +60 °C) |
| Certifications | CE, UL 508, maritime approvals, IEC 62026-2 (AS-i spec) |
| Lifecycle Status | Discontinued (replacement: 3RX9502-0BA00 + 6EP1333-2AA01) |
h2 Technical Principles and Innovative Values
- Innovation Point 1: Dual-Output Consolidation with Shared Primary: Conventional AS-i cabinets wire a dedicated 30 V AS-i PSU for the yellow cable and a separate 24 V SITOP for valve coils / master aux. The 3RX9306-1AA00 merges both behind one 115/230 V primary, halving the DIN footprint and eliminating a second primary fusing point. For cabinets where every 17.5 mm width counts (automotive sub-cells, packaging-machine control chests), this consolidation is the difference between “fits” and “doesn’t.”
- Innovation Point 2: Integrated Data Decoupling — No External 3300 µF Cap: AS-i modulates ±8 V Manchester-coded data on top of the 30 V DC bus, which means the PSU needs low output impedance and a decoupling capacitor bank to keep the signal clean. The 3RX9306-1AA00 bakes the decoupling stage (including the bulky electrolytic) onto the same PCB as the 30 V reg—no external decoupling module, no extra terminal row, no “why is my AS-i checksum drifting” debugging at 3 a.m.
- Innovation Point 3: Electronic Short-Circuit Isolation with Bus Survival: When a branch or slave lead shorts, the combi’s limiter clamps that segment while the 30 V main and the 24 V aux keep delivering to healthy loads. The AS-i master still sees the bus alive and can report the exact slave address in Diagnostics. This “fault isolation without bus collapse” is what lets a conveyor line drop one jammed photo-eye without stopping the whole sortation segment—and it’s why maintenance teams standardize the 3RX9306-1AA00 on multi-segment AS-i cells.