APC APC3RA RBC12 compatible replacement. Sigma SG-RBC12P is an AGM UPS replacement set. The supplied assembly contains 8 batteries in two 24V 18Ah modules, as shown in the photos.
Both modules are included. Preserve the original UPS wiring configuration; the individual module rating does not by itself specify the complete UPS battery-bank voltage or capacity.
RBC12 replacement specifications
| APC cartridge reference | RBC12 / APCRBC12 |
|---|---|
| Supplier assembly reference | SG-RBC12P |
| Package contents | One complete set with two connected four-battery modules |
| Module voltage and capacity | 24V, 18Ah per module |
| Total internal battery quantity | 8 |
| Internal battery reference | SG1290T2 |
| Nominal rating per internal battery | 12V 9Ah |
| Chemistry | Rechargeable AGM sealed lead-acid (SLA) |
| Connections | Wired connectors and fuse arrangement as shown; compare against your existing cartridge |
| Supplier-listed dimensions per module | 5.94 × 10.54 × 4.2 inches |
| Supplier-listed approximate set weight | 45 lb |
Check fit and connections
Match the full UPS model and revision, cartridge reference, connector shape, fuse arrangement, polarity and available clearance. Compare the original assembly with the supplied photos. Follow the UPS manufacturer’s replacement procedure. The UPS is not included.
This version uses 9Ah batteries. Capacity alone does not promise a fixed runtime increase: actual backup time depends on load, temperature, battery condition and the UPS cutoff voltage.
Internal battery documents
These documents describe the individual SG1290T2 battery, not the complete wired cartridge.
Related products and ordering help
Browse APC UPS batteries. Email Sales@RocketDistributing.com with your UPS model, RBC number, connector photos and required quantity for matching help or volume pricing.
APC is a trademark of Schneider Electric. This is an aftermarket compatible replacement supplied by Sigma Power Systems.