6EP1336-3BA10 20A 24VDC Power Supply

Introduction to the Siemens 6EP1336-3BA10

When a control system demands stable 24 V DC power with high current capacity, the 6EP1336-3BA10 from Siemens SITOP PSU8200 series provides a reliable solution. This stabilized power supply accepts a wide input range of 120-230 V AC or 110-220 V DC, making it suitable for global applications. With an output rated at 24 V DC and 20 A, it powers demanding loads such as PLCs, sensors, and actuators. Its compact 90 x 125 x 125 mm enclosure fits easily into control cabinets.

Key Features and Technical Specifications

The 6EP1336-3BA10 is engineered for performance and dependability. Below are the core specifications extracted from the official datasheet:

• Input voltage: 120-230 V AC (85-275 V AC full range) or 110-220 V DC (88-350 V DC)
• Output voltage: 24 V DC adjustable 24-28 V via potentiometer
• Output current: 20 A rated, 0-20 A continuous, with derating above +60 °C
• Efficiency: 94% typical
• Power loss: 31 W typical at rated output
• Buffering time: 20 ms minimum at rated output
• Short-circuit protection: Constant current approx. 21.5 A or latching shutdown
• Overvoltage protection: < 31.8 V
• Galvanic isolation: SELV (ES1) per EN 61204-7, transformer per EN 61558-2-16
• Protection class: IP20
• Dimensions: 90 x 125 x 125 mm (W x H x D)
• Weight: 1.2 kg

One distinctive feature is the wide-range input, which allows operation from 85 V AC up to 275 V AC and 88 V DC to 350 V DC. This flexibility ensures stable performance across varying grid conditions. Additionally, the adjustable output voltage (24-28 V) enables compensation for voltage drops in long cable runs.

Applications and Use Cases

It can power 24 V DC control circuits, including PLCs, HMIs, sensors, and solenoid valves. Its high output current supports systems with multiple loads, reducing the need for additional power supplies. Moreover, its buffering time of 20 ms helps maintain operation during brief mains interruptions, preventing unexpected shutdowns.

For example, in a packaging machine, the 6EP1336-3BA10 can reliably supply power to the control cabinet, ensuring consistent operation of servo drives and logic controllers. Its robust short-circuit protection prevents damage to downstream equipment, minimizing downtime.

Installation and Setup

Mounting the 6EP1336-3BA10 is straightforward. It snaps onto a standard DIN rail EN 60715 35x7.5/15. The screw terminals accept wire sizes as follows:

• Input (L, N, PE): 1 terminal each for 0.2-4 mm²
• Output (+, -): 2 terminals each for 0.2-4 mm²
• Auxiliary contacts (13, 14, 15, 16): 1 terminal each for 0.14-1.5 mm²

Ensure adequate spacing around the unit: 50 mm top and bottom, 0 mm left and right. This allows proper convection cooling. For 1-phase operation, a 10 A miniature circuit breaker with characteristic C is recommended in the feeder. For 2-phase operation, use a 2-pole circuit breaker or specific Siemens breakers (3RV2711-1HD10 at 120 V or 3RV2711-1ED10 at 230 V).

Maintenance and Reliability

With an MTBF of 583,500 hours at 40 °C, the 6EP1336-3BA10 offers long service life. Routine inspection should include checking terminal tightness and verifying the green LED indicates 24 V OK. The unit has no moving parts, reducing wear. Operating temperature range is -25 to +70 °C, with derating above +60 °C. For optimal reliability, ensure ambient temperature stays within limits and airflow is not obstructed.

Regularly verify that the output voltage remains within tolerance (3% overall). If the yellow overload LED illuminates, reduce the load or improve cooling. The red latching shutdown LED indicates a fault; reset by cycling input power.

Compatibility and Integration

The 6EP1336-3BA10 can be paralleled with up to two units to increase power. It also supports switchable characteristic for bridging (buffering) and remote ON/OFF via auxiliary contacts. The relay contact (NO, 60 V DC/0.3 A) provides a '24 V OK' signal for monitoring. This makes it easy to integrate into existing control systems.

Troubleshooting and Common Issues

If the output voltage is missing, check input power and fuses. If the green LED is off, verify input voltage is within range. If the yellow overload LED is on, the load may exceed the rated current; reduce load or add a second unit. If the red LED is lit, a latching shutdown occurred; cycle input power to reset. For persistent issues, consult the Siemens manual or contact AutoDCSTech.

Product Support and Availability

The 6EP1336-3BA10 is available from AutoDCSTech. Please verify current lifecycle status and availability before ordering. Contact AutoDCSTech for pricing and delivery.