Siemens 6ES5935-8ME11 Power Supply | 24V DC 5A for S5 Rack

The Siemens 6ES5935-8ME11 power supply provides DC power for SIMATIC S5 rack systems. This unit converts AC line voltage into stable 24 V DC output. It mounts directly into the S5-100U or S5-115U rack slot. You can use this supply as a direct replacement for failed units.

Detailed Technical Specifications

The Siemens 6ES5935-8ME11 power supply measures 250 mm in length. Its width reaches 160 mm across the main body. The total height goes up to 60 mm including heat sink. This unit weighs approximately 1.2 kilograms for secure mounting.

Key hardware parameters include:

Complete Model: Siemens 6ES5935-8ME11
Input voltage: 120/230 V AC selectable (47-63 Hz)
Output voltage: 24 V DC regulated
Output current: 5 A continuous rating
Output power: 120 W maximum
Hold-up time: 20 ms at full load
Energy storage: Two large electrolytic capacitors
Efficiency: 85% typical at nominal load
Ripple: Less than 50 mV peak-to-peak
Protection: Short-circuit and overvoltage

The Siemens 6ES5935-8ME11 power supply stores significant energy in its capacitors. Therefore, technicians must wait sixty seconds after AC removal before handling. The unit operates reliably from 0°C to +60°C. Moreover, it includes a green LED for DC output status indication.

Technical Parameter	Specification
Full Model Number	Siemens 6ES5935-8ME11
Dimensions (LxWxH)	250 mm x 160 mm x 60 mm
Weight	1.2 kg
Input Voltage	120/230 V AC selectable
Input Frequency	47-63 Hz
Output Voltage	24 V DC regulated
Output Current	5 A continuous
Output Power	120 W
Hold-up Time	20 ms
Efficiency	85% typical
Output Ripple	<50 mV peak-peak
Operating Temperature	0°C to +60°C
Humidity Tolerance	5% to 85% non-condensing

Application and Installation

The Siemens 6ES5935-8ME11 power supply slots into the leftmost position of an S5 rack. It powers all backplane modules including CPUs and I/O cards. This unit includes a voltage selector switch for 120 V or 230 V operation. Consequently, you can use the same model in different countries.

Protection and Reliability

This supply features fold-back current limiting for short-circuit protection. Its overvoltage crowbar circuit prevents damage to downstream modules. The Siemens 6ES5935-8ME11 includes a thermal shutdown for overheating conditions. Therefore, the unit recovers automatically when the temperature normalizes.

Always select the correct input voltage before applying AC power. Connect the ground terminal to the mounting rack for safety. The unit features a removable front cover for fuse access. Furthermore, its metal housing provides excellent electromagnetic shielding.