The Siemens 6EP1336-3BA10 is a high-power member of the SITOP PSU8200 family, built to supply a stable 24 V DC / 20 A control and auxiliary power rail in industrial automation. It is designed for DIN-rail mounting, uses screw terminals, and supports a wide-range AC input plus DC input capability, making it well suited for global machine builds, OEM panels, and production lines where uptime matters more than drama.
In many factories, “24 V DC” is the nervous system of the machine: PLCs, remote I/O, sensors, safety circuits, valves, contactors, and industrial network devices all sip from the same supply. When that rail sags or drops, the machine doesn’t merely stop—it often stops confusingly. The 6EP1336-3BA10 targets that problem with high output current, fast dynamic regulation, selectable protection behavior, and a clear signaling concept for monitoring and diagnostics.
Typical use cases
This model makes the most sense when you need serious 24 V headroom in a single supply, such as:
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Central 24 V DC distribution feeding multiple load groups (I/O, comms, actuators)
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High inrush loads (valve manifolds, contactors, industrial switches) that would stress smaller PSUs
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Automation cabinets where you want one robust supply rather than many small ones
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Global projects that may face different mains conditions (wide-range input is your friend)
Technical Specifications (Quick Reference Table)
| Parameter | Value / Notes |
|---|---|
| Product / Family | Siemens SITOP PSU8200 |
| Model | 6EP1336-3BA10 |
| Input network type | 1-phase and 2-phase AC or DC |
| AC input (rated) | 120–230 V AC |
| AC input range | 85–275 V AC |
| DC input (rated) | 110–220 V DC |
| DC input range | 88–350 V DC |
| Hold-up time | Minimum 20 ms at rated output current (specified conditions) |
| Output voltage | 24 V DC (controlled, isolated) |
| Output adjustment | 24–28 V via potentiometer |
| Rated output current | 20 A |
| Rated output power | Typical 480 W |
| Efficiency | 94% |
| Ripple (max) | 100 mV |
| Status signaling | Green LED “24 V OK”; relay NO contact 60 V DC / 0.3 A for “24 V OK” |
| Protection (short-circuit) | Short-circuit proof; selectable constant-current or latching shutdown behavior |
| Overload capability | 150% of rated current up to 5 s/min (normal operation) |
| Environmental | Operating -25…+70 °C (natural convection) |
| Ingress protection | IP20 |
| Mechanical size (W×H×D) | 90 × 125 × 125 mm |
| Mounting | Snaps onto DIN rail EN 60715 (35×7.5/15) |
| Weight | Net 1.06 kg |
Electrical performance: stable 24 V under real industrial load behavior
A high-current PSU is only useful if it behaves well when the load changes quickly. The 6EP1336-3BA10 specifies tight regulation under both input and load variation, and fast response to load steps. For example, the datasheet lists setting times typically around 1 ms for certain load step transitions, and a maximum setting time of 5 ms.
This matters when multiple devices start simultaneously: an I/O island powers up, a switch negotiates links, a valve bank actuates, and suddenly the current demand spikes. Stable regulation reduces nuisance resets and communication dropouts, keeping the machine’s control layer predictable.
The PSU also specifies no overshoot (soft start) behavior at turn-on. In practice, soft-start behavior helps protect sensitive loads and reduces the chances of triggering protection circuits in downstream devices.
Protection philosophy: choose the behavior that fits your plant
Industrial troubleshooting often comes down to one philosophical question: when something goes wrong, should the PSU keep trying or fail clearly?
This PSU supports switchable characteristic behavior, and the datasheet describes short-circuit protection as either constant current characteristic (approx. 21.5 A typical) or latching shutdown.
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Constant current mode can be useful when loads have temporary inrush or when you want the system to ride through short disturbances without stopping.
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Latching shutdown is often preferred when you want faults to be obvious and persistent, forcing a deliberate reset and making it easier to diagnose wiring errors or failed loads.
In addition, the unit supports overload capability in normal operation (150% of rated current up to 5 seconds per minute). That is especially relevant for automation loads that are usually below 20 A but experience short peaks.
For visual diagnostics, the PSU provides a green LED for normal operation (“24 V OK”), plus indicators for overload and latching shutdown (yellow and red, respectively).
Monitoring and remote control features for modern panels
Beyond “it powers things,” the 6EP1336-3BA10 provides practical panel integration features:
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A relay signaling contact (NO) rated 60 V DC / 0.3 A for “24 V OK.”
This can feed a PLC input, alarm stack, or maintenance monitoring system so the cabinet can report “power healthy” as a real signal, not a guess. -
Remote ON/OFF terminals are provided (listed as auxiliary contacts 15/16 in the connection data).
Remote control is useful in systems that stage power-up sequences, coordinate battery-buffer modules, or require controlled shutdown behavior.
Parallel operation and scalability
When one supply is not enough, you want a path forward that does not involve redesigning the entire cabinet. The datasheet notes that two units can be connected in parallel to increase power (number of parallel-switched devices: 2).
Parallel operation can be used to scale output power, distribute thermal load, or create a more modular spare-parts strategy. If you plan parallel systems, good practice is symmetric wiring (equal cable lengths and conductor sizing) to encourage current sharing, and careful protection coordination upstream.
Installation and wiring: practical details that save commissioning time
The 6EP1336-3BA10 uses screw terminals and supports common industrial conductor sizes at the input and output (input L/N/PE and output +/-, plus terminals for auxiliary contacts).
Mechanically, it is designed to snap onto a standard 35 mm DIN rail and can be lined up with other devices. Siemens specifies required spacing (top and bottom 50 mm) to support natural convection cooling, which is a simple rule that significantly improves thermal margin and long-term reliability.
Standards, approvals, and reliability indicators
For globally deployed machines, approvals and EMC behavior are not “paperwork,” they are schedule insurance. The datasheet lists compliance and approvals including CE, cULus (UL 508 / CSA C22.2 No. 107.1), UKCA, EAC, and relevant EMC standards such as EN 55022 Class B and immunity standard EN 61000-6-2.
It also provides a reliability metric: MTBF at 40 °C of 583,500 hours. While MTBF does not guarantee real-world lifetime, it is a useful comparative indicator when selecting between industrial PSUs for continuous-duty environments.
Conclusion
The Siemens 6EP1336-3BA10 is a strong choice when you need a dependable 24 V DC / 20 A industrial power backbone with wide-range input flexibility, high efficiency, selectable protection behavior, and cabinet-friendly monitoring and control features. It is engineered for the reality of automation loads: inrush, overload events, fast transients, and the need for clear diagnostics.
