Siemens 6ES7405-0RA02-0AA0 SIMATIC S7-400 PS405 20A DC Power Supply

The Siemens 6ES7405-0RA02-0AA0 SIMATIC S7-400 PS405 power supply accepts 24, 48 or 60 V DC input and delivers 5 V DC at 20 A to the backplane bus plus 24 V DC at up to 1 A, the highest-current PS405 in this range. Typical active power input is 168 W. It occupies two rack slots and weighs 1.3 kg.

Technical Specifications

Certifications & Standards

• CCC
• BIS

Selection Notes

At 20 A on the 5 V DC backplane bus, the PS405 20 A covers a fully loaded multi-segment S7-400 rack where the combined module current draw exceeds what a lower-current PS405 supplies. Its 56 A inrush current is higher than the smaller units', a factor to check against upstream fuse or breaker curves at startup.

Applications

The 20 A backplane rating and 217 mm depth suit a densely populated S7-400 rack, such as a central rack carrying multiple communication processors alongside standard I/O. Confirm the sum of module backplane-bus current draw against this 20 A rating before finalizing the module list.