Siemens 6ES5951-7ND11 | SIMATIC S5 Power Supply Module

Technical Overview of the Power Supply Module

The Siemens 6ES5951-7ND11 provides regulated DC power for SIMATIC S5 PLC systems. This module converts AC mains voltage into stable DC supply for backplane operation. It delivers 5V and 24V outputs to support CPU and I/O modules. The design includes overload and short-circuit protection for safe industrial use.

Key Technical Specifications

This section details the exact parameters for the Siemens 6ES5951-7ND11 power supply module. Use these figures to verify correct system power sizing.

Parameter	Specification
Part Number	6ES5951-7ND11
Type	Power Supply Module
Product Family	SIMATIC S5
Input Voltage	230V AC (nominal)
Input Frequency	50/60 Hz
Output 1	5V DC, 20A
Output 2	24V DC, 1A
Total Output Power	Approx. 120W
Efficiency	Approx. 85%
Protection	Short-circuit and overload
Dimensions (W x H x D)	Approx. 250 x 25 x 180 mm
Weight	Approx. 2.5 kg
Compatibility	SIMATIC S5-115U, 135U, and 155U racks

Application and System Integration

This power supply module mounts directly into the S5 rack’s leftmost slot. It powers all backplane modules through the bus connectors. The Siemens 6ES5951-7ND11 delivers 5V DC at 20A for logic circuits. Its additional 24V output drives external field devices.

Reliability and Performance Features

The built-in protections prevent damage from wiring faults or system overloads. This module operates efficiently with minimal heat dissipation. Its rugged construction ensures stable operation in industrial environments. Engineers trust the Siemens 6ES5951-7ND11 for consistent power delivery.