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Can you replace the ST206D, ST306S, ST306ST or ST316ST trip units for CM circuit breakers?

Issue:  
Are the trip units ST 206D, ST 306S, ST 306ST or ST 316ST for the CM-HE or CM-HH molded case circuit breakers still available?  

Product line:  
Molded case circuit breakers

Environment:  
Trip units for Compact CM 1250-2500A circuit breakers

Cause:  
Can you replace a 55722 part number?  It is the ST206D trip module on a CM1600HE.

Resolution:  
The CM breakers and all related components including the ST206D, ST306S, ST306ST and ST316ST trip units are all obsolete.  Replace with a Powerpact R-frame breaker.  
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