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Siemens 6ES5951-7LB21 SIMATIC S5 PS 951 3 A Power Supply Module

Siemens 6ES5951-7LB21 SIMATIC S5 PS 951 3 A Power Supply Module

Product Name: SIMATIC S5 PS 951 3 A Power Supply Module

Brand Name: Siemens

Model Number: 6ES5951-7LB21

Place of Origin: Germany

Warranty: 12 Months

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Specifications
Commercial Terms
Description
Power Distribution
FAQ
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After-Sales Support
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Sales	Email	Phone/Whatsapp
Jim Pei	[email protected]	+86 18020776782

Specifications

TECHNICAL PROFILESIMATIC S5-115H / Power Supply Module

Model Number	6ES5951-7LB21
Product Family	SIMATIC S5-115H
Product Type	PS 951 power supply module
Rated Input Voltage	120 / 230 V AC
Permissible Input Range	94 to 132 V / 187 to 264 V AC
Rated Line Frequency	50 Hz
Permissible Frequency Range	47 to 63 Hz
Input Current at 120 / 230 V	0.55 / 0.33 A
Maximum Inrush Current	15 × rated input current
Power Consumption	44.8 W
Main Output Voltage	5 V
Main Output Tolerance	±1.5%
Main Output Current	3 A
Permissible Main Output Range	0.3 to 3 A
PG/OP Output Voltage	5.2 V
PG/OP Output Current	1 A maximum
Auxiliary Output Voltage	24 V
Auxiliary Output Tolerance	±5%
Auxiliary Output Current	0.2 A maximum
Backup Battery	Lithium, 3.6 V / 5 Ah
Minimum Backup Time	1 year at 0.3 mA and 25 °C
Mains Buffering	20 ms minimum
Short-Circuit Protection	Electronic
Primary Fuse	Integral
Galvanic Isolation	Yes
Isolation Test Voltage	2700 V DC
Typical Power Loss	19.8 W
Approximate Weight	1.6 kg (3.53 lb)

Values apply to the exact 6ES5951-7LB21 ordering configuration; verify the installed hardware and system design before commissioning.

Commercial Terms

ORDER FRAMEOrder details

Minimum Order Quantity	1 Piece
Price	Contact for Jim
Packaging Details	Original new Factory Sealed
Delivery Time	3–7 Days
Payment Terms	T/T
Shipping Method	DHL / FedEx / UPS / TNT
Supply Ability	Brand new, In Stock

Description

01 / DRIVE PROFILE

Siemens 6ES5951-7LB21 is the PS 951 power supply module documented for the SIMATIC S5-115H system. It accepts 120/230 V AC and produces the regulated 5 V system supply at 3 A, with a permissible output-current range from 0.3 A to 3 A.

02 / SYSTEM ROLE

Separate outputs provide 5.2 V for PG/OP equipment at up to 1 A and 24 V auxiliary power at up to 0.2 A. The module also includes battery-backed retention support using a 3.6 V, 5 Ah lithium battery and provides a minimum one-year backup time at the stated reference conditions.

The input voltage selector, battery condition, internal fuse, and connected loads must be checked before commissioning. The official technical page lists 20 ms minimum mains buffering, electronic short-circuit protection, galvanic isolation, and an approximate module weight of 1.6 kg.

Power Distribution

120/230 V AC
Source

→

PS 951 regulation
Power Distribution

→

S5 system loads
Destination

System rail
Provides the regulated 5 V, 3 A output used by the S5 system electronics.

Programming supply
Provides a separate 5.2 V output for PG/OP equipment at up to 1 A.

Retention support
Maintains the documented battery-backed function using the specified lithium battery.

FAQ

What main DC output does 6ES5951-7LB21 provide?

The PS 951 supplies 5 V at 3 A, with an allowed operating range from 0.3 A to 3 A.

Can 6ES5951-7LB21 power a PG or OP separately?

Yes. A dedicated 5.2 V output is specified for PG/OP equipment at up to 1 A.

What auxiliary voltage is available from 6ES5951-7LB21?

The auxiliary output is 24 V with a maximum current of 0.2 A and a tolerance of ±5%.

Which battery is documented for 6ES5951-7LB21?

The module uses a 3.6 V, 5 Ah lithium battery for the documented backup function.

What must be checked on 6ES5951-7LB21 before applying mains power?

Confirm the 120/230 V selector position, protective conductor, fuse condition, battery condition, and output load wiring.

How does 6ES5951-7LB21 handle a short mains interruption?

The technical data lists at least 20 ms of mains buffering at the stated minimum input condition.

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