The Siemens 6EP1322-2BA00 is a compact, industrial-grade SITOP PSU100S switched-mode power supply designed for reliable 12 V DC control power in automation cabinets. It is built for DIN-rail mounting, provides galvanic isolation between input and output, and delivers a stable DC output with fast transient response—exactly the kind of “quiet, predictable electricity” that PLCs, I/O, sensors, industrial communication devices, and small actuators appreciate when the real world gets noisy.
In many machines, the power supply is not the glamorous part, but it is often the part that determines whether your system feels “rock solid” or “mysteriously flaky.” The 6EP1322-2BA00 focuses on practical cabinet reliability: controlled isolated output voltage, short-circuit proof behavior, and overload capability for handling inrush currents and momentary load peaks.
Where it fits best
This unit is a strong match for applications that need a dedicated 12 V rail, such as:
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PLC and distributed I/O islands that run on 12 V DC
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Industrial Ethernet switches, gateways, and protocol converters requiring regulated 12 V
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Sensor groups and measurement chains where output ripple and stability matter
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Machine retrofits where DIN-rail footprint and wiring simplicity are priorities
Because it is designed for industrial cabinets, it supports typical automation wiring practices (screw terminals, standard conductor sizes, cabinet spacing guidance) and common compliance expectations (CE, UL/cULus, UKCA, EAC).
Key Technical Specifications (Summary Table)
| Item | Specification |
|---|---|
| Product family | Siemens SITOP PSU100S |
| Model / Order No. | 6EP1322-2BA00 |
| Input | 1-phase AC |
| Rated supply voltage | 120 V / 230 V AC (automatic range selection) |
| Input voltage range | 85–132 V AC or 170–264 V AC |
| Line frequency | 47–63 Hz (50/60 Hz nominal) |
| Output | Controlled, isolated DC voltage |
| Rated output voltage | 12 V DC |
| Output adjustment range | 11.5–15.5 V (via potentiometer) |
| Rated output current | 7 A |
| Output power | Typical 84 W |
| Efficiency | Typical 84% |
| Ripple | Typical 20 mV, max 150 mV |
| Hold-up time | Minimum 20 ms (at rated load, specified conditions) |
| Overload behavior | 150% of rated current up to 5 s/min (normal operation) |
| Short-circuit protection | Short-circuit proof, constant current characteristic |
| Protection (overvoltage) | Overvoltage protection < 20 V |
| Status indication | Green LED “12 V OK” |
| Signaling contact | Relay NO contact, rated 60 V DC / 0.3 A for “12 V OK” |
| EMC standards | EN 55022 Class B, EN 61000-3-2, EN 61000-6-2 |
| Protection class | IP20 |
| Operating temperature | -25 to +70 °C (natural convection) |
| Dimensions (W×H×D) | 50 × 125 × 120 mm |
| Net weight | 0.39 kg |
| Mounting | DIN rail EN 60715 (35×7.5/15), snap-on |
Performance and cabinet-level reliability
Stable output with fast transient response
In real automation loads, the challenge is often dynamic behavior: a relay bank turns on, a valve island wakes up, a network switch negotiates links, and current demand jumps. This PSU is designed for controlled output regulation and quick recovery from load steps, with a typical 1 ms setting time for certain load step transitions noted in the technical data.
Overload and short-circuit behavior that supports uptime
A power supply that instantly collapses under a brief peak can create confusing “blink faults” across a control system. The 6EP1322-2BA00 includes overload capability (150% of rated current up to 5 seconds per minute in normal operation) and short-circuit proof protection using a constant-current characteristic, which can help prevent a single wiring issue from turning into a cabinet-wide mystery.
Hold-up time for brief mains disturbances
Short dips or micro-outages happen in factories—especially when large inductive loads or nearby drives switch. The specified minimum 20 ms buffering time (under defined conditions) is intended to bridge brief interruptions so control electronics can keep running rather than rebooting.
Installation notes that matter (and save headaches later)
DIN-rail footprint and spacing
With a 50 mm width and DIN-rail snap-on mounting, it is cabinet-friendly for standard control panels. Siemens also specifies required spacing—notably 50 mm top and bottom—to support natural convection cooling. Respecting these clearances improves thermal margin and long-term reliability, especially near the upper end of the operating range.
Wiring and terminals
The unit uses screw terminals and supports common conductor sizes (0.5 to 2.5 mm² ranges are listed for input, output, and signaling connections). This keeps it compatible with typical industrial wiring practices and helps reduce installation friction during builds and retrofits.
Output adjustment for real-world voltage drops
A practical feature is the adjustable output range (11.5–15.5 V) via potentiometer. This is useful when you have long cable runs or heavy load distribution and want to compensate for voltage drop at the point of load—while still keeping within device tolerances.
Monitoring and diagnostics
The front-panel green “12 V OK” LED provides quick visual confirmation during commissioning. For remote monitoring, the PSU provides a relay “12 V OK” signaling contact (NO, rated 60 V DC / 0.3 A), which can be integrated into a PLC input, alarm stack, or maintenance notification logic. This is the kind of tiny feature that pays back the first time a technician has to diagnose a cabinet under time pressure.
Compliance and interoperability
For global machine builds, approvals and EMC behavior matter. The technical data lists compliance and approvals including CE, UL/cULus (UL 508 / CSA C22.2 No. 107.1), UKCA, and EAC, as well as EMC standards such as EN 55022 Class B for emitted interference. These details help when the same machine design needs to ship across regions or into customers with strict panel standards.
Why choose 6EP1322-2BA00 in a 12 V control architecture?
If your system requires a dependable 12 V DC / 7 A rail with industrial mounting, isolation, monitoring contact, and cabinet-ready electrical performance, the Siemens 6EP1322-2BA00 is a pragmatic, no-drama option. It is not trying to be exotic; it is trying to be predictable—and in automation, predictability is a feature you can build a business on.
