Siemens 6ES5955-3LC14 | SIMATIC S5 Power Supply Unit

Technical Overview of the Power Supply Unit

The Siemens 6ES5955-3LC14 provides a robust power supply unit for large SIMATIC S5 PLC systems. This unit converts AC mains voltage into stable DC outputs for backplane operation. It delivers high-current 5V and 24V supplies to support extensive I/O configurations. The design incorporates comprehensive protection features for demanding industrial applications.

Key Technical Specifications

This section details the exact parameters for the Siemens 6ES5955-3LC14 power supply unit. Use these figures to ensure proper power budgeting for your system.

Parameter	Specification
Part Number	6ES5955-3LC14
Type	Power Supply Unit
Product Family	SIMATIC S5
Input Voltage	230V AC (nominal)
Input Frequency	50/60 Hz
Output 1	5V DC, 40A
Output 2	24V DC, 2A
Total Output Power	Approx. 248W
Efficiency	Approx. 87%
Protection	Short-circuit, overload, and overtemperature
Dimensions (W x H x D)	Approx. 250 x 25 x 180 mm
Weight	Approx. 4.0 kg
Compatibility	SIMATIC S5-135U and 155U systems

Application and System Integration

This power supply unit fits into the leftmost slot of the S5-135U or 155U rack. It energizes all connected CPU, I/O, and communication modules reliably. The Siemens 6ES5955-3LC14 delivers 5V at 40A for high-density logic configurations. Its 24V output at 2A supports external field devices directly. Consequently, the unit eliminates the need for additional power sources.

Reliability and Performance Features

The comprehensive protection suite guards against wiring faults and thermal stress. This unit operates with high efficiency, reducing energy costs and heat output. Its rugged construction ensures continuous operation in harsh environments. System integrators rely on the Siemens 6ES5955-3LC14 for stable power in large-scale automation.