Siemens 6ES7505-0KA00 S7-1500 System Power Supply, 25W, 24V DC Input

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Product Specifications

Brand: Siemens

Part Number: 6ES7505-0KA00-0AB0

Product Type: S7-1500 System Power Supply

Series: SIMATIC S7-1500 PS

Input Voltage: 24 V DC (19.2–28.8 V DC)

Backplane Power: 25 W

Efficiency: ≥85%

Mounting: 35 mm DIN Rail (S7-1500 Profile Rail)

Dimensions (W×H×D): 35 × 147 × 129 mm

Weight: Approx. 350 g

Product Description

The Siemens 6ES7505-0KA00-0AB0 is the entry-level PS 25W system power supply for the SIMATIC S7-1500 and ET 200MP platforms. It supplies 25 W to the backplane bus to power module electronics and LED indicators in small to medium automation configurations.

Key Features

24 V DC input with reverse-polarity and short-circuit protection
Delivers 25 W to the S7-1500 backplane bus — sized for compact CPU and I/O configurations
Ultra-compact 35 mm housing — ideal for space-constrained control panels
20 ms mains buffering bridges short power interruptions
Galvanic isolation (707 V DC type test) between primary and secondary sides
SELV-compliant output for enhanced safety
Status LED for local diagnostics
Surge immunity per IEC 61000-4-5: ±1 kV symmetrical, ±2 kV asymmetrical

Technical Data

Parameter	Value
Input Voltage	24 V DC (19.2–28.8 V DC)
Rated Input Current	1.3 A at 24 V DC
Backplane Bus Power	25 W
Efficiency	≥85%
Power Loss	6.2 W (rated conditions)
Mains Buffering	20 ms
Mounting	35 mm DIN Rail (S7-1500 profile rail)
Dimensions (W×H×D)	35 × 147 × 129 mm
Weight	Approx. 350 g
Operating Temperature	0 °C to +60 °C
Protection Class	IP20, Class III with protective conductor

Applications

The PS 25W is tailored for compact S7-1500 installations with a single CPU and a modest I/O module count. It is the most space-efficient system power supply in the S7-1500 family — ideal for small machine controllers, standalone automation cells, and distributed ET 200MP stations. For configurations requiring more backplane power, the PS 60W models (6ES7505-0RA00, 6ES7507-0RA00) provide 60 W output.