Application Scenarios
A contract packager in the Midwest runs a fleet of semi-automatic case-sealers, each controlled by a Siemens S7-1214C PLC, a KTP700 HMI, 18 photoelectric sensors, and a solenoid bank for the flap-folder cylinders. The original cabinets were built in 2008 with linear 24 V / 8 A supplies that ran scalding-hot and tripped intermittently whenever two cylinders fired together — the inrush on the solenoid manifold exceeded what the old PSU could sustain for more than a second. The panel shop swapped in the Siemens 6EP1334-2BA20 as a direct footprint replacement: same DIN rail position, same screw-terminal layout, no rewire. The 6EP1334-2BA20‘s 1.5× rated-current capability (15 A for 5 s/min) absorbed the solenoid inrush without blinking, and the 120% continuous-overload rating at 45 °C meant the summer shop floor (usually ~42 °C inside the cabinet) no longer pushed the supply into thermal foldback. Within a month, nuisance “PLC undervoltage” trips dropped from 3–4 per week to zero. The plant electrician’s comment: “Didn’t change a single line of ladder logic — just stopped fighting the power.”
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 6EP1334-2BA20 |
| Manufacturer | Siemens (SITOP PSU100S / SITOP Smart) |
| Product Category | Stabilized Switching Power Supply |
| Input Voltage | 1-phase AC 120 / 230 V, auto-ranging (85–132 V / 170–264 V range) |
| Output Voltage / Current | 24 V DC / 10 A (adjustable 22.8–28 V via front potentiometer) |
| Rated Power | 240 W |
| Efficiency | Approx. 90% at rated load |
| Overload Capability | 150% rated (15 A) for 5 s/min; 120% continuous at ≤ 45 °C |
| Output Ripple (typ.) | 20 mV peak-peak (bandwidth 20 MHz) |
| Protection | Short-circuit (constant current), overvoltage (< 33 V), current limitation 12–14.6 A |
| MTBF at 40 °C | ~1,614,510 hours |
| Mounting / Dimensions | 35 mm DIN rail (EN 60715); 70 × 125 × 120 mm (W × H × D) |
| Ambient / Protection | -25 to +70 °C, IP20 |
Technical Principles and Innovative Values
Innovation Point 1: Auto-ranging input with no voltage-selector switch. The 6EP1334-2BA20 accepts 120 V and 230 V mains across two wide bands (85–132 V / 170–264 V) and self-adapts — no rear slider, no jumpers. For OEMs shipping the same panel to North America and Europe, that’s one less BOM variant and zero risk of a technician leaving a selector in the wrong position.
Innovation Point 2: 1.5× / 5-second inrush + 120% long-haul overload. Most “10 A” supplies clip at 105–110%. The 6EP1334-2BA20 will hold 15 A for 5 seconds out of every minute, and sustain 12 A continuously at 45 °C ambient. That covers solenoid banks, motor-starter aux coils, and capacitive inrush on long sensor looms — the three things that usually trip a borderline-sized PSU.
Innovation Point 3: 70 mm width on a 10 A, 240 W unit. At 70 mm (≈ 4 TE), the 6EP1334-2BA20 is among the narrowest 10 A/24 V supplies in the SITOP lineup, saving DIN-rail real estate in crowded panels where every centimeter counts. Pair that with screw terminals (not spring) and you get field-tech-friendly wiring that doesn’t loosen on high-vibration skids.
Application Cases and Industry Value
A municipal wastewater lift station in Ohio standardized its PLC panels on the Siemens 6EP1334-2BA20 after a string of failures on a cheaper import brand. Each station runs a S7-1200 CPU, a SM1231 analog input card reading 4–20 mA for wet-well ultrasonic level, and a 24 V coil contactor for the 7.5 kW duty pump plus a standby. The import supply was rated 10 A on paper but folded under the combined inrush of the contactor coil + the level transducer heater during winter warm-up. Replacing it with the 6EP1334-2BA20 eliminated the “PLC reboot on pump start” events entirely. The district’s maintenance lead logged a 60% reduction in after-hours callouts over the first six months — not because the pumps changed, but because the PSU stopped being the weakest link. The 6EP1334-2BA20 also slotted cleanly into the existing DIN layout, so the swap was a lunch-break job per station.
Related Product Combination Solutions
Building a SITOP-fed cabinet around the 6EP1334-2BA20? These siblings and add-ons cover most 24 V rack topologies:
- 6EP1333-2BA20 — SITOP PSU100S 24 V / 5 A, the smaller sibling when 10 A is overspec.
- 6EP1336-2BA10 — SITOP PSU100S 24 V / 20 A, step up when sensor + servo + I/O load exceeds 10 A.
- 6EP1332-2BA20 — SITOP PSU100S 24 V / 2.5 A, ultra-narrow for standalone LOGO! panels.
- 6EP1961-4BA00 — SITOP BUFFER module (2 × 24 V capacitor buffer) to ride through < 100 ms mains dips without PLC reboot.
- 6EP1964-4BA00 — SITOP UPS 24 V module (battery-backed) for graceful S7 shutdown on prolonged outage.
- 6EP1971-4BA00 — SITOP RED1200 redundancy module, for 1+1 parallel 6EP1334-2BA20 configs in critical loops.
