60 amp. ITE breaker in a Seimens Panel

Is a ITE 60 amp. breaker allowed or properly fit into a Seimens service panel. TKS

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Click on the first Eaton link of classified breakers here:
http://www.google.com/webhp?hl=en&tab=ww#hl=en&sugexp=les%3Bcpsugrpq2&gs_nf=3&gs_mss=classified%20breake&cp=19&gs_id=hk&xhr=t&q=classified+breakers&pf=p&tbo=d&output=search&sclient=psy-ab&oq=classified+breakers&gs_l=&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&fp=946618dc30a8941&bpcl=37643589&biw=1280&bih=628