About SIEMENS 6ES5951-7LB21 POWER SUPPLY

SIEMENS 6ES5951-7LB21 POWER SUPPLY

Power supply modules gener ate the voltages required by the programmable controller from the external power supply:

+ 5 V as supply voltage for all modules;
+ 5,2 V as supply voltage for the PG 605 programmer, the OP 393 and OP 396 operator panels and the BT 777 (observe max. current);
+ 24 V for the 20 mA current loop interfaces.

Power supply modules are available with one or two backup batteries, depending on the model. These can be replaced even when the power supply is switched off. In the case of the power supply modules with only one backup battery, the backup voltage is supplied via sock ets during replacement. In those with two backup batter ies, the second battery be gins to supply the backup voltage as soon as the first one fails. This also applies when it is removed for re placement.
Five power supply modules are available for the S5 115U/H programmable controller.

Reliable Power for SIMATIC S5-115U PLC Systems

Built to empower industrial automation, the SIEMENS 6ES5951-7LB21 delivers steady 5V DC power at up to 16A, ideal for S5-115U PLC installations. Its industrial-grade construction, overload protections, and wide input voltage range ensure reliability even under challenging conditions. The unit's rack-mount design allows easy integration into existing control panels, supporting seamless system operation for critical automation tasks.


Efficient and Safe Operation

Engineered with galvanic isolation and both overload and short-circuit protection, this power supply prioritizes system safety and equipment longevity. The natural air cooling mechanism keeps the unit's temperature regulated without the need for additional fans, reducing maintenance and improving operational efficiency in automation environments.


Versatile and User-Friendly Design

With easily accessible panel mount terminals and screw mounting, installation is straightforward. The selectable input voltage feature accommodates various power infrastructures, while the clear LED status display aids rapid diagnostics. Compact dimensions and durable metal housing make it suitable for space-constrained or industrial-grade applications.