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This is a flat-type switching power supply of Siemens SITOP PSU100D series, part number 6EP1334-1LD00. It is designed for 24V DC power supply in industrial automation control systems. This model has been discontinued, and the upgraded variant 6EP1334-1LD01 from the same SITOP PSU100D series is recommended as the replacement.
- Model Code Definition
| Model Segment | Meaning | Description |
| 6EP | Siemens Power Supply | Product code for Siemens power supply series |
| 1334 | Product Group | Flat power supply of PSU100D series, 24V DC output, 12.5A rating |
| 1LD00 | Version Code | Revision number: 1 = basic version, LD = PSU100D series, 00 = original release |
| PSU100D | Product Series | Flat power supply; 100 = series code, D = flat design |
| 24V/12.5A | Output Specification | 24V DC output voltage, 12.5A output current, rated power 300W |
- Main Technical Specifications
| Category | Technical Data | Remarks |
| General Information | ||
| Product Type | Flat-type switching power supply | SITOP PSU100D series, single-phase input |
| Part Number | 6EP1334-1LD00 | Unique official Siemens part code |
| Replacement Model | 6EP1334-1LD01 | Upgraded version with output current increased to 14.6A |
| Weight | 0.81 kg | Rust-proof aluminum alloy housing, robust and durable |
| Status | Discontinued | Manufacturer recommends the upgraded model for replacement |
| Electrical Parameters | ||
| Input Voltage Range | AC 85-132V / 170-264V | Wide-range input with automatic range switching |
| DC 120-370V | ||
| Input Frequency | 47-63 Hz | Compatible with global power grids |
| Rated Output Voltage | DC 24V | Standard voltage for industrial control |
| Output Voltage Adjustment Range | 22-28 V | Adjustable to suit various load requirements |
| Rated Output Current | 12.5 A | Rated power: 300W |
| Output Ripple | ≤150 mVpp | Low ripple, ideal for sensitive electronic devices |
| Efficiency | Approx. 88% | Energy-saving design |
| Power Factor | ≥0.95 | Grid-friendly performance |
| Protection Functions | ||
| Overcurrent Protection | Short-circuit protection with auto-recovery | Operates in hiccup mode under output short circuit |
| Overvoltage Protection | 28.5-30 V | Prevents load damage caused by overvoltage |
| Overtemperature Protection | Activates when internal temperature ＞85°C | Automatic load reduction or shutdown |
| Reverse Polarity Protection | Available | Protects power supply from incorrect wiring |
| Mechanical & Environmental Parameters | ||
| Dimensions (W × H × D) | 105 × 125 × 120 mm | Compact flat design for space saving |
| Mounting Type | DIN rail mounting / Direct mounting | Flexible installation options |
| Housing Material | Rust-proof aluminum alloy | Excellent heat dissipation, IP20 protection class |
| Operating Temperature | -10…+70°C | No derating required below +50°C |
| Storage Temperature | -25…+85°C | Suitable for harsh storage conditions |
| Relative Humidity | 10…95% | Non-condensing |
| Shock / Vibration Resistance | 30g / 5g | Adapted to industrial site environments |
- Cross-brand & Old/New Model Replacement List
| Original Model | Replacement Model | Brand | Replacement Description |
| 6EP1334-1LD00 | 6EP1334-1LD01 | Siemens | In-series upgrade; output current raised to 14.6A, fully functionally compatible |
| 6EP1334-1LD00 | 6EP1334-1LA00 | Siemens | SITOP PSU100L series, similar functions with different mounting dimensions |
| 6EP1334-1LD00 | SD24-300 | Phoenix Contact | 24V/12.5A, flat design, DIN rail mount |
| 6EP1334-1LD00 | TRIO-PS/3AC/24DC/12.5 | Weidmüller | Wide-range input, IP20 protection, equivalent performance |
Selection Tip: PSU100D (old) / LD01 (new); 24V/12.5A upgraded to 14.6A. For third-party alternatives, choose Phoenix Contact SD24 or Weidmüller TRIO series.
- Full Model List (SITOP PSU100D Series)
| Model | Part Number | Output Rating | Input Range | Key Features |
| PSU100D 24V/2.2A | 6EP1331-1LD00/1LD01 | 24V DC/2.2A | 100-240V AC | Low power, natural convection cooling |
| PSU100D 24V/3.1A | 6EP1332-1LD00/1LD01 | 24V DC/3.1A | 100-240V AC | Low-to-medium power, natural convection cooling |
| PSU100D 24V/4.1A | 6EP1332-2LD00/2LD01 | 24V DC/4.1A | 100-240V AC | Medium power, natural convection cooling |
| PSU100D 24V/6.2A | 6EP1333-1LD00/1LD01 | 24V DC/6.2A | 100-240V AC | Medium power, natural convection cooling |
| PSU100D 24V/12.5A | 6EP1334-1LD00 | 24V DC/12.5A | 100-240V AC/120-370V DC | High power, fan cooling |
| PSU100D 24V/14.6A | 6EP1334-1LD01 | 24V DC/14.6A | 100-240V AC/120-370V DC | Upgraded high power model, fan cooling |
| PSU100D 12V/3A | 6EP1321-1LD00 | 12V DC/3A | 100-240V AC | 12V output, low power |
- Common Faults & Troubleshooting Guide
| Fault Phenomenon | Possible Causes | Troubleshooting Steps | Solutions |
| No output, green indicator off | 1. Abnormal input power | 1. Measure input voltage (range: 85-264V) | 1. Repair input power supply |
| 2. Defective power module | 2. Check if power switch is turned on | 2. Replace the power module | |
| 3. Incorrect wiring | 3. Verify polarity of input and output wiring | 3. Rewire in accordance with manuals | |
| Low / unstable output voltage | 1. Overloaded load | 1. Check if output current exceeds 12.5A | 1. Reduce load or use higher-power power supply |
| 2. Misadjusted voltage potentiometer | 2. Inspect position of voltage adjustment knob | 2. Readjust output voltage to 24V | |
| 3. Aging filter capacitors | 3. Check capacitors for bulging or leakage | 3. Replace faulty filter capacitors | |
| 4. Overheating due to fan failure | 4. Verify fan operation | 4. Replace the fan | |
| Frequent power supply restarts | 1. Excessive input voltage fluctuation | 1. Test input ripple with oscilloscope | 1. Add input filter or voltage stabilizer |
| 2. Instantaneous load overload | 2. Check load for short circuit or inrush current | 2. Optimize load design and add buffer circuit | |
| 3. Activated overtemperature protection | 3. Measure housing temperature (limit: 85°C) | 3. Improve ventilation and remove dust | |
| Excessive output ripple | 1. Failed output filter capacitors | 1. Measure output ripple (limit: 150mVpp) | 1. Replace output filter capacitors |
| 2. Unstable load | 2. Check load for high-frequency switching components | 2. Add filter circuit at load side | |
| 3. Poor grounding | 3. Inspect grounding connection | 3. Implement single-point grounding to reduce interference |
- Application Environments & Industry Cases
6.1 Applicable Scenarios
Industrial Automation: Power supply for PLC, HMI, sensors, actuators and other control components
Mechanical Equipment: 24V control circuits of packaging machines, machine tools, robots, etc.
Process Control: Power supply for precision devices such as instruments, valve positioners and analytical equipment
Harsh Industrial Environments: Wide operating temperature (-10°C ~ +70°C), shock and vibration resistance, suitable for factory workshops
Space-limited Installation: Flat form factor, supports DIN rail mounting or direct installation inside equipment
6.2 Not Recommended Scenarios
Ultra-high precision applications (ripple ＜50mVpp): Adopt high-precision power supplies of SITOP PSU6200 series
Outdoor installation without extra protection: IP20 rating requires additional protective enclosures
High electromagnetic interference environments: Equip with EMC filters or isolation transformers
6.3 Typical Application Cases
Case 1: PLC Control System for Automotive Component Production Line
Configuration
Power Supply: 6EP1334-1LD00 (24V/12.5A)
Controller: S7-1200 PLC + KTP700 HMI
Loads: 16 solenoid valves, 20 proximity switches, 8 photoelectric sensors
Process
Controls automotive seat assembly lines for part conveying, positioning, pressing and other processes
Result
Wide input voltage range adapts to grid fluctuations and ensures continuous line operation
Short-circuit protection prevents system downtime caused by solenoid valve faults and improves equipment reliability
Case 2: Drive System for Food Packaging Machinery
Configuration
Power Supply: 2 pcs × 6EP1334-1LD00 (redundant configuration)
Drives: 3 pcs × V90 servo drives
Control Components: Touch panel, encoders, safety relays
Process
Controls feeding, sealing, cutting and other high-speed & high-precision actions of packaging machines
Result
Redundant design enhances system availability and avoids line shutdown due to power failure
Low ripple output ensures stable operation of servo drives and improves packaging accuracy
Case 3: Power Supply System for Warehouse & Logistics AGV
Configuration
Power Supply: 6EP1334-1LD00 (installed inside AGV control cabinet)
Battery Charger: SITOP Charger 24V/5A
Loads: AGV controller, motor drives, laser navigation sensors
Process
Provides 24V control power for AGV and charges backup batteries simultaneously
Result
Wide temperature tolerance adapts to warehouse environments; vibration resistance fits mobile equipment
High efficiency saves energy, extends battery life and reduces operational costs
- Installation & Maintenance Guidelines
- Installation Position
Install inside control cabinet, keep away from direct sunlight and heat sources. Reserve a clearance of ≥50mm for heat dissipation.
Mount vertically to ensure unobstructed airflow for the built-in fan (12.5A model equipped with fan).
- Wiring Requirements
Separate input and output cables to avoid interference.
Use power cables with cross-sectional area ≥2.5mm² to guarantee current-carrying capacity.
Apply single-point grounding for shielded cables; grounding at the power input side is recommended.
- Periodic Maintenance
Inspect fan operation and remove dust every 3 months.
Measure output voltage and ripple every 6 months to maintain stable performance.
Check capacitor condition and replace aged units annually.
- Replacement Solution
Prioritize the upgraded model 6EP1334-1LD01 (24V/14.6A) for new projects.
For higher reliability requirements, select redundant power supply systems of SITOP PSU8200 series.
