Cummins 6CTAA8.3-G9 vs Perkins 1206A-E70TTAG2: compare 50 Hz standby requirements

The catalog lists the same standby output for these two engines, but a standby match does not settle a prime-power purchase.

Quick comparison: matching documented ratings

Diesel · 50 Hz. Figures refer to the identified source configurations, not Haifeng test results. Confirm the exact build and site conditions before selection.

Cummins 6CTAA8.3-G9 vs Perkins 1206A-E70TTAG2: compare 50 Hz standby requirements
Rating basis	Cummins 6CTAA8.3-G9	Perkins 1206A-E70TTAG2
Standby · 50 Hz	200 kWe	200 kWe

Cummins: C250D5 package with the 6CTAA8.3-G9 engine only. Prime output is withheld pending configuration reconciliation.

Source scope and checks before selection

The Cummins C250D5 package listing shows 182 kW prime with this engine, while our engine record lists 160 kWe. These are not interchangeable configuration claims. Exact engine/package reconciliation is required.
Perkins PN3185/06/18 page 4 specifies 180 kWe prime, versus 184 in the catalog. This comparison uses the document value. Cummins prime output is withheld until the engine/package configuration is reconciled.

Which should you shortlist?

Begin with the generator package rather than assuming every set using the same engine has the same output. Request the generator model, alternator and exact rating sheet. Resolve the prime-rating discrepancy before using it to size a continuously operating project.

Three checks before requesting a quote

Match the operating duty. Keep standby backup separate from prime variable-load operation. These 50 Hz ratings do not establish output at 60 Hz.
Check the complete package: voltage, alternator, load steps, ambient temperature and altitude. Ask for the resulting site rating and test scope.
Confirm support and documentation: exact engine suffix, serial-specific parts information, available service documents and destination-specific emissions evidence. A catalog label alone does not prove compliance.

Sources and comparison method

Reviewed 21 October 2026. This is a document and catalog comparison by Haifeng Machinery, an equipment supplier. Matching fuel, frequency and duty does not establish identical reference conditions or interchangeability. No independent test, price, stock or reliability ranking is claimed.

Cummins generator package listing
C250D5 package: 200 kW standby / 182 kW prime; does not validate all 6CTAA8.3-G9 packages.
Perkins PN3185/06/18 — page 4
Attached ElectropaK sheet: 180 kWe prime / 200 kWe standby at 1,500 rpm.

Cummins 6CTAA8.3-G9: specifications and documents Perkins 1206A-E70TTAG2: specifications and documents

Can one replace the other?

A similar electrical rating is only a starting point. Mounting, coupling, cooling, controls, emissions and site requirements need a package-level review. Send the existing generator model or nameplate with your question.