SS822
Power Voting Unit · 3BSC610042R1
Lifecycle note: Preserve supply A/B wiring and test each voting path and supervision circuit before returning the redundant supply to service.
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+86-18020776786Power Voting Unit · Redundant 24 V DC Supply
ABB SS822, article number 3BSC610042R1, is a power voting unit for redundant DC power-supply arrangements. It combines two nominal 24 V DC inputs through separate voting paths and supervises the supply voltages. The rated load current is 20 A; the separate 35 A overload figure is not a continuous operating rating.
The supervision thresholds are 22 V for decreasing voltage and 30 V for increasing voltage, with 0.7 V hysteresis. At maximum current, the output is approximately 0.5 V below the input. ABB specifies 10 W heat dissipation at 20 A and 2.5 W at 5 A, so cabinet thermal design and the downstream voltage margin must be checked together.
For a system-integrator retrofit or MRO replacement, preserve the existing supply A/B identification, alarm wiring and load distribution. Check the 50 × 125 × 110 mm installation envelope and prescribed clearances, and include both power-path and supervision-contact checks in the acceptance plan. A healthy output voltage alone does not establish that both redundant input paths or both monitoring circuits are functioning.
| Manufacturer / model | ABB / SS822 |
|---|---|
| Article number | 3BSC610042R1 |
| Nominal supply inputs | 2 × 24 V DC |
| Rated output current | 20 A |
| Overload output current | 35 A; overload rating |
| Rated input power | 500 W |
| Voltage drop at maximum current | Output approximately 0.5 V below input |
| Heat dissipation | 10 W at 20 A; 2.5 W at 5 A |
| Low / high supervision trip | 22 V decreasing / 30 V rising; hysteresis 0.7 V each |
| Supervision contact rating | AC: max. 120 V / 0.5 A; DC: max. 28 V / 1 A |
| Power terminal conductors / torque | Solid 0.5–6 mm²; stranded 0.5–4 mm²; 0.8 Nm |
| Dimensions / mass | W 50 × H 125 × D 110 mm / 630 g |
| Required mounting spacing | Width 10 mm; height 25 mm |
| Enclosure / ambient limit | IP20 / max. 55 °C on horizontal DIN rail |
Preserve supply A/B wiring and test each voting path and supervision circuit before returning the redundant supply to service.
With the load secured under the approved test procedure, test loss and restoration of supply A and supply B separately while monitoring the load voltage and corresponding supervision signals. Recording only the combined output with both supplies present can hide a non-contributing path.
ABB lists 20 A as the rated output current and 35 A as an overload value. A purchasing specification based on 35 A continuous service would misstate the documented rating. Size the normal load and thermal allowance using the rated duty.
The SS822 supervision table gives a low trip point of 22 V on decreasing voltage and a high trip point of 30 V on rising voltage, with 0.7 V hysteresis for each. Check both sweep directions in the documented acceptance test rather than expecting identical switch and reset voltages.
ABB specifies approximately 0.5 V less at the output than the input at maximum current. Include that drop and the cable drop when checking the minimum voltage at the most remote load; setting the upstream supply to a nominal value does not by itself prove the load margin.
The DC contact specification states a minimum 1 mA and recommends at least 5 mA. Compare the receiving input current with that requirement and use an approved interface if needed; the contact maximum-current rating does not address low-current contact operation.
ABB lists 10 W dissipation at 20 A and 2.5 W at 5 A. Use the applicable operating duty in the enclosure heat balance instead of treating a passive voting unit as heat-free. Retain the specified mounting spacing and horizontal DIN-rail orientation when applying the ambient limit.
No. Power terminals accept solid 0.5–6 mm² or stranded 0.5–4 mm² conductors. Supervision terminals accept solid or stranded 0.2–1.5 mm². The recommended torque is 0.8 Nm for both, but the conductor ranges must remain separate on the wiring schedule.
Do not transfer the SS823 features to SS822. The manual separately describes double overvoltage-protection circuits and expanded voting-element diagnostics for SS823. Treat any change between these types as an engineering review, not an identical spare substitution.
Send the model, complete part number, quantity, destination and nameplate photo. We will verify identification details before confirming availability and lead time.
Official PDF: ABB SS822 Official Manual Extract. File size is below 1 MB; verify the exact installed hardware and configuration before use.
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