Siemens 6ES7407-0DA01-0AA0 PS407 4A Power Supply

Reliable Power Delivery for S7-400 Racks

The Siemens 6ES7407-0DA01-0AA0 functions as a PS407 4A power supply module for the SIMATIC S7-400 series. This module converts AC or DC input into stable DC outputs for powering the backplane bus and connected modules. It accepts a wide input range of 120/230 V AC (85-264 V) or 120/230 V DC (88-300 V) at 47-63 Hz. The module delivers a primary output of 5 V DC at 4 A for the backplane bus, requiring a minimum base load of 100 mA. An auxiliary output of 24 V DC at 0.5 A supports low-current peripheral devices. It also provides robust protection features including short-circuit protection and galvanic isolation between primary and secondary circuits.

Technical Specifications

Specification	Value
Model	6ES7407-0DA01-0AA0
Product Type	PS407 4A Power Supply Module
Input Voltage	120/230 V AC (85-264 V) or 120/230 V DC (88-300 V)
Input Frequency	47-63 Hz
Output Voltage (Primary)	5 V DC, 4 A (minimum base load 100 mA)
Output Voltage (Auxiliary)	24 V DC, 0.5 A
Hold-up Time	> 20 ms
Active Power	52 W (typical)
Losses	20 W (typical)
Efficiency	Approx. 85%
Protection	Overvoltage, undervoltage, overload, short-circuit, galvanic isolation
Backup Battery	Optional lithium AA 3.6 V, 2.3 Ah
Dimensions (W x H x D)	25 mm x 290 mm x 217 mm
Weight	Approx. 0.78 kg
Protection Class	IP20
Approvals	FM, CE, UL, cUL
Operating Temperature	-25 °C to +60 °C
Storage Temperature	-40 °C to +85 °C

Performance and Protection Features

A hold-up time exceeding 20 ms ensures system stability during brief mains dips. The power supply achieves a typical active power of 52 W with losses around 20 W. An optional backup battery (lithium AA 3.6 V, 2.3 Ah) preserves CPU data when required. The module includes comprehensive safety mechanisms including overvoltage, undervoltage, overload, and short-circuit protection. Furthermore, the LED indicators on the front panel provide clear visual feedback for operational status and fault conditions. The green “5V DC” LED confirms proper output voltage, while the red “Overload” LED signals any abnormal conditions requiring attention. The module also features a reset input for manual restart after fault conditions. An isolated power supply design ensures low-noise operation for sensitive analog modules.

Thermal Characteristics and Efficiency

The Siemens 6ES7407-0DA01-0AA0 achieves a high efficiency of approximately 85% under nominal load conditions. Its operating temperature range of -25 °C to +60 °C supports deployment in harsh industrial environments. The module’s maximum temperature rise remains within 40 K above ambient during continuous operation. Its power density of 50 W per liter of volume demonstrates a compact yet efficient design. Furthermore, the module dissipates heat through natural convection, eliminating the need for forced cooling in most applications.

Mounting and Installation

The Siemens 6ES7407-0DA01-0AA0 mounts directly onto the S7-400 rack via the dedicated backplane bus connector. Wiring connects via 3 x 1.5 mm² terminals with a protective earth connection per Protection Class I. The module’s compact dimensions of 25 mm width by 290 mm height by 217 mm depth ensure seamless integration into existing cabinets. The module also provides a selector switch for input voltage selection, allowing the operator to manually select between 120 V and 230 V AC. Clear labeling on the terminal block minimizes wiring errors during installation. This power supply module supports both horizontal and vertical mounting orientations.