N-CSR Item 10 - Exhibits: Certifications EX-99.CERT


I, Richard J. Thomas, certify that:

1.    I have reviewed this report on Form N-CSR of Cash Trust Series, Inc. on
      behalf of: Government Cash Series, Municipal Cash Series, Prime Cash
      Series, and Treasury Cash Series ("registrant");

2.    Based on my knowledge, this report does not contain any untrue
      statements of a material fact or omit to state a material fact
      necessary to make the statements made, in light of the circumstances
      under which such statements were made, not misleading with respect to
      the period covered by this report;

3.    Based on my knowledge, the financial statements and other financial
      information included in this report, fairly present in all material
      respects the financial condition, results of operations, changes in net
      assets, and cash flows (if the financial statements are required to
      include a statement of cash flows) of the registrant as of, and for,
      the periods presented in this report;

4.    The registrant's other certifying officers and I are responsible for
      establishing and maintaining disclosure controls and procedures (as
      defined in rule 30a-2(c) under the Investment Company Act of 1940) for
      the registrant and have:

a.    designed such disclosure controls and procedures to ensure that
            material information relating to the registrant, including its
            consolidated subsidiaries, is made known to us by others within
            those entities, particularly during the period in which this
            report is being prepared;

b.    evaluated the effectiveness of the registrant's disclosure controls and
            procedures as of a date within 90 days prior to the filing date
            of this report (the "Evaluation Date"); and

c.    presented in this report our conclusions about the effectiveness of the
            disclosure controls and procedures based on our evaluation as of
            the Evaluation Date;

5.    The registrant's other certifying officers and I have disclosed, based
      on our most recent evaluation, to the registrant's auditors and the
      audit committee of the registrant's board of directors (or persons
      performing the equivalent functions):

a.    all significant deficiencies in the design or operation of internal
            controls which could adversely affect the registrant's ability to
            record, process, summarize, and report financial data and have
            identified for the registrant's auditors any material weaknesses
            in internal controls; and

b.    any fraud, whether or not material, that involves management or other
            employees who have a significant role in the registrant's
            internal controls; and

6.    The registrant's other certifying officers and I have indicated in this
      report whether or not there were significant changes in internal
      controls or in other factors that could significantly affect internal
      controls subsequent to the date of our most recent evaluation,
      including any corrective actions with regard to significant
      deficiencies and material weaknesses.



Date: July 28, 2003
/S/ Richard J. Thomas
Treasurer - Principal Financial Officer