Alta Series™ COS-6 Metering CT



600V Metering current transformers are used in a wide variety of commercial and industrial applications where revenue class metering is necessary for billing purposes. The COS-6 is specifically engineered for meter cabinet enclosures.



The core is constructed from wound layers of high accuracy, low loss electrical grade steel. The core is evenly wound with enamel coated copper wire to ensure against potential short circuits. The core and coil assembly is encapsulated in polyurethane specifically engineered for premium dielectric, mechanical and thermal properties for use in both indoor and outdoor applications.

Test Reports

Each COS-6 has a unique serial number which allows the customer to track each test record. Certified test reports are stored electronically and provided with every shipment.

Technical Specifications

  • Primary currents: up to 800 Amps
  • Secondary current: 5 Amps
  • Frequency: 60 Hz
  • Inner diameter: 1.07” [27mm]; 1.65″ [42mm]
  • Outer diameter: 3.37” [86mm]
  • Bar Length: 11.89″ [302mm]; 12.15″ [309mm]
  • Rating Factors: Up to RF 4
  • Metering class: 0.15% from 1% of nominal current through Rating Factor

All Peak Demand 600V metering CTs are now RUS listed.


High Accuracy, Extended Range

The Alta Series high accuracy, extended range current transformers exceed the IEEE 0.15S accuracy standard. These CTs meet or exceed every 600V metering class CT in the industry with metering class 0.15 from 1% of nominal current through rating factor. The COS-6 is also available in standard accuracy with or without a primary bar.


Cross Reference

ABB AccuRange™ CBT-S; GE ITI RevenueSense™ JCT-0S; Ritz DCAW/B