Siemens 6EP34368SB000AY0 DIN Rail Power Supply
Key Specifications Compared
| Spec | 6EP34368SB000AY0 (primary) | 6EP34368SB002AY0 | 6EP34368UB000AY0 | 6EP34368MB002CY0 |
|---|---|---|---|---|
| AC Voltage – Input | 400–500 VAC | 320–575 VAC | 320–550 VAC | 320–575 VAC |
| Current – Output (Max) | 20 A | 20 A | 17 A | 4 × 5 A |
| Efficiency | 94 % | 93 % | 94 % | 93 % |
| Operating Temperature | 25°C – 70°C (derating) | 25°C – 60°C | 25°C – 70°C | 25°C – 60°C |
| Encapsulation | Bulk | Box | Box | Box |
| Number of Outputs | 1 | 1 | 1 | 4 |
Readily cross-reference ratings with the intended load profile and input condition before committing to any alternate.
Why similar – 6EP34368SB002AY0
Shares the Siemens SIRIAS 480 W series topology and adjustable 24 V output; same 20 A, IP20, and adjustable-output feature set. The input window is wider (320–575 VAC vs 400–500 VAC) and it ships in box packaging rather than bulk.
Why similar – 6EP34368UB000AY0
Same Siemens 6EP343x8 family and SIRIAS platform; identical 94 % efficiency and IP20 adjustable output. Output current drops to 17 A, with a slightly narrower upper input limit (550 VAC vs 575 VAC).
Why similar – 6EP34368MB002CY0
Retains the Siemens SIRIAS 6EP343x8 series chassis, IP20 rating, adjustable-output function, and comparable efficiency (93 %). The primary distinction is a quad single-phase output architecture (4 × 5 A) for distributed load segments, replacing the single 20 A rail.
Safety and Certification Coverage
The primary unit carries CB, cCSAus, CE, CSA, cUL, cULus, and UL listings suitable for hazardous-location, industrial, and ITE (commercial) applications. The alternate 6EP34368SB002AY0 adds EAC to its certification matrix, while 6EP34368UB000AY0 also lists EAC. Certification scope is the panel builder’s responsibility to verify against the specific installation standard and jurisdiction.
Input Flexibility and DC Capability
The primary 6EP34368SB000AY0 is specified for 400–500 VAC three-phase operation. Other Siemens DIN rail units in the catalog support wider or dual AC/DC input ranges—for instance, 6EP13361LB00 accepts 100–240 VAC or 85–264 VAC and tolerates DC input from 88–370 V, which may simplify designs requiring universal mains or battery-backed redundancy.
Thermal and Derating Considerations
The primary unit specifies 25°C – 70°C operation with derating. At elevated ambient temperatures (above 40°C) or with suboptimal ventilation, output current must be reduced per the Siemens derating curve for the SIRIAS series. Both 6EP34368SB002AY0 and 6EP34368MB002CY0 cap at 60°C maximum ambient, making them less forgiving in warm enclosures.
Output Architecture Trade-offs
| Parameter | Single 20 A (primary) | Quad 4 × 5 A (MB variant) |
|---|---|---|
| Wiring complexity | One output rail | Four independent rails |
| Fault isolation | Single branch affected | Fault confined per channel |
| Load balancing | Manual distribution | Built-in segmentation |
| Total current | 20 A | 20 A (4 × 5 A) |
The quad-output variant suits applications requiring isolated load segments or simplified branch fusing without external distribution blocks.