The Siemens 6EP1961-3BA21 is a SITOP PSE202U redundancy module designed to decouple two SITOP power supplies for building a redundant 24 V DC power system. It accepts input from two separate power supplies (each up to 20 A) and delivers a combined output of up to 40 A, ensuring continuous power to critical loads even if one supply fails.
Item No :
6EP1961-3BA21Order(MOQ) :
1Payment :
EXWProduct Origin :
GermanyShipping Port :
Wuhan, Hubei, ChinaLead Time :
3-5 daysWeight :
0.4kgOverview
6EP1961-3BA21 SIMATIC PLC Module
New in stock
Origin from Germany
Payment Method: TT.Western Union
Shipping Method: DHL\UPS\Fedex\EMS\Others
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| Part Number | Description | Key Difference |
|---|---|---|
| 6EP1961-3BA21 | SITOP PSE202U Redundancy Module, 24V/40A (this item) | Standard redundancy module |
| 6EP1961-2BA00 | SITOP Select Diagnostic Module | For selective branch monitoring |
| SITOP Power Supplies | e.g., 6EP1336-2BA00 | Required input sources (two units needed) |
| 6EP1961-3BA01 | Buffer Module (related) | For bridging brief power failures (different function) |
Important: Two SITOP power supplies (each rated up to 20 A) are required to use this redundancy module. The module does not generate power—it only decouples and combines the two input sources.
1 × Siemens 6EP1961-3BA21 SITOP PSE202U Redundancy Module
Note: SITOP power supplies, input/output cables, and DIN rail are sold separately.
In Stock – Ready to ship immediately
Genuine Siemens Product – Factory original SITOP component, PM300 Active status
Warranty Included – Purchase with confidence
Technical Support – Redundant power system configuration assistance available
Q1: What is the Siemens 6EP1961-3BA21?
It is a SITOP PSE202U redundancy module that decouples two 24 V DC power supplies (each up to 20 A) and delivers a combined output of up to 40 A. It ensures uninterrupted power to critical loads if one supply fails.
Q2: Does this module generate power?
No. The redundancy module does not generate power. It requires two separate SITOP power supplies as input sources and combines their outputs through diode decoupling.
Q3: What is the purpose of diode decoupling?
The diodes isolate the two input sources from each other. If one power supply fails or develops a fault, the diode prevents reverse current from flowing into the failed supply, and the healthy supply continues to power the load without interruption.
Q4: How does the module signal a fault?
It provides both LED indicators (green for both inputs OK, red for fault) and a potential-free relay contact (changeover, 8 A/240 V AC or 24 V DC) for remote monitoring. The response threshold is adjustable from 20 to 25 V DC.
Q5: What is the maximum output current?
The maximum output current is 40 A total. Above 60°C ambient temperature, derating of 3%/K applies up to 70°C.
Q6: What is the efficiency of this module?
The typical efficiency is 96.5% at rated output, with a power loss of 34 W at full load and 1.5 W at no-load.
Q7: Does this module provide galvanic isolation?
No. There is no galvanic isolation between input and output. The relay contact is SELV-rated.
Q8: What are the dimensions and weight?
Approximately 70 × 125 × 125 mm (W × H × D) and 0.400 kg.
Q9: Is this product suitable for marine applications?
Yes. It carries ABS and DNV marine approvals, making it suitable for shipboard and offshore installations.
Q10: What is the country of origin?
Romania.
Q11: What should I verify before ordering?
Always verify the exact part number (6EP1961-3BA21), confirm that you have two compatible SITOP power supplies (each up to 20 A), ensure your load does not exceed 40 A total, and check whether the relay contact is required for your monitoring system.
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