ABB SS855 2PAA125624R1 Power supply voter / redundancy module

FAQ

Q1: What is the ABB SS855 2PAA125624R1?
A: It is an ABB power-supply voter used to combine and decouple two redundant DC power supplies feeding a common load.

Q2: What is the rated output current of the SS855?
A: The rated output current is 40 A.

Q3: How many power supplies can be connected to one SS855?
A: It has two input channels, allowing two redundant power supplies to be connected. The inputs are isolated from each other using MOSFET technology.

Q4: What input voltage does the SS855 accept?
A: Each input accepts 8.4–36.4 V DC, making it suitable for typical 24 V DC control-system power supplies.

Q5: Can the SS855 provide 40 A redundancy?
A: Yes. ABB specifies that two SS855 units can be used in parallel to achieve redundant 40 A operation with two 40 A power supplies.

Q6: Does the SS855 have a power-OK monitoring relay?
A: No. The SS855 itself does not provide power-OK signals. ABB recommends using the power-OK signals available on compatible power supplies such as SD834, SD853 or SD854.

Q7: What are the dimensions and weight?
A: The SS855 measures approximately 36 × 124 × 127 mm and weighs about 280 g.

Q8: Is the SS855 suitable for industrial and hazardous-area applications?
A: Yes. ABB lists UL508, ATEX Zone 2, IECEx Zone 2 and Class I Division 2 approvals, and specifies operation up to +70 °C with current derating above 60 °C.

2PAA125624R1 ABB SS855

We will use wear-resistant cartons to seal the boxes, and take photos for your confirmation before sealing. We will pack the boxes only after confirmation.

For express delivery, we will use DHL, UPS, TNT, FedEx and EMS.

Please rest assured that we have a deep cooperation with express delivery companies and can ensure that your goods are delivered to you in good condition.