PDU and RPP designers have to solve several electrical problems in the same enclosure: available fault current, branch interrupting capability, equipment SCCR, selective coordination, footprint, serviceability, and future circuit changes. Eaton’s Bussmann series Quik-Spec Coordination Panelboard (QSCP) packages a fusible answer around CUBEFuse and Compact Circuit Protector technology.

The result is not a substitute for a short-circuit or coordination study. It is a platform that gives designers high published ratings and a simpler path to documenting those studies across 208 V, 415/240 V, 480 V, and other systems within the product’s listed limits.

What the Current QSCP Platform Provides

Current Eaton product literature describes QSCP as a UL 67/cULus compact fusible distribution panel for systems up to 600 Vac. Configurations are available with mains up to 600 A, branch disconnects up to 200 A, and assembly SCCR options up to 200 kA. The platform uses CCP2B branch disconnects through 100 A and CCP2 for 200 A branch applications, both paired with Class CF CUBEFuse.

QSCP is offered with multiple circuit counts and NEMA enclosure options. Eaton also states that it uses the same footprint as traditional circuit-breaker panelboards and is smaller than conventional fusible panelboards. Exact mains, branch counts, enclosure types, feed arrangements, surge options, and ratings depend on the selected configuration.

Four Design Problems Addressed by One Platform

•  High SCCR: an assembly rating up to 200 kA can simplify compliance where the calculated available fault current exceeds the rating of ordinary branch panelboards.

•  Selective coordination: published Bussmann fuse ratios and Eaton breaker-to-fuse tables provide a repeatable way to coordinate mains, feeders, and branches.

•  Compact integration: the panelboard footprint can reduce the redesign burden when an OEM adds a fusible option to a PDU or RPP lineup.

•  Serviceability and status: finger-safe branch components, local open-fuse indication, and available signaling or monitoring options can support safer troubleshooting and shorter restoration time when correctly configured.

Why “Up to 200 kA” Must Be Specified Carefully

The CUBEFuse interrupting rating and the QSCP assembly SCCR are different values. A CUBEFuse may have up to a 300 kA interrupting rating at 600 Vac, while the QSCP assembly is available with SCCR options up to 200 kA. The final equipment label and submittal—not the fuse rating alone—determine the assembly rating that can be compared with available fault current.

The same discipline applies when the QSCP is integrated into a larger PDU or RPP. Power distribution blocks, bus structures, monitoring components, contactors, transformers, connectors, and other devices can affect the SCCR of the completed equipment. The OEM must establish and mark the rating of the complete assembly.

A Practical QSCP Specification Checklist

•  System voltage, frequency, phase, grounding method, normal and alternate source configuration, and available fault current.

•  Main type and ampere rating, branch count, branch pole configuration, load characteristics, conductor sizes, and required spare capacity.

•  Required SCCR for the complete PDU/RPP and the exact QSCP configuration used to achieve it.

•  Selective-coordination path for every source, including upstream breakers or fuses and downstream rack-level protection.

•  Enclosure rating, top or bottom feed, mounting, surge protection, open-fuse indication, remote signaling, lockout provisions, labeling, and spare-fuse storage.

•  Submittal drawings, bill of materials, commissioning checks, maintenance instructions, and change-control requirements.

Conclusion

QSCP simplifies PDU and RPP design because it starts with a compact, high-SCCR fusible platform and published coordination data. The strongest specification still names the exact configuration, traces the complete fault-current and coordination path, and verifies the rating of the finished equipment. Used that way, QSCP turns several difficult protection requirements into one coherent, auditable design decision.

Models Mentioned

Sources

• Eaton Bussmann Series — Quik-Spec Coordination Panelboard, Data Sheet No. 1160

• Eaton Bussmann Series — Compact Circuit Protector Base CCP2B, Data Sheet No. 1161

• Eaton Bussmann Series — QSCP for Data Center Applications, Product Profile No. 11326

• Eaton Bussmann Series — QSCP Application Note No. 3148