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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                   FORM 12b-25

                                            Commission File Number 0-8162

                           NOTIFICATION OF LATE FILING

(Check One):   |_| Form 10-K     |_| Form 11-K     |_| Form 20-F   |x| FORM 10-Q

|_|  Form N-SAR
     For Period Ended:     MARCH 31, 2000
|_|  Transition Report on Form 10-K        |_|   Transition Report on Form 10-Q
|_|  Transition Report on Form 20-F        |_|   Transition Report on Form N-SAR
|_|  Transition Report on Form 11-K
         For the Transition Period Ended:_______________________________________

         Read attached instruction sheet before preparing form. Please print or
type.

         Nothing in this form shall be construed to imply that the Commission
has verified information contained herein.

         If the notification relates to a portion of the filing checked above,
identify the item(s) to which the notification relates:_________________________

________________________________________________________________________________
                                     PART I
                             REGISTRANT INFORMATION

Full name of registrant      ACCEL INTERNATIONAL CORPPORATION
                             ___________________________________________________
Former name if applicable
________________________________________________________________________________

Address of principal executive office (Street and Number)
                                 75 WEST STREET
________________________________________________________________________________
City, state and zip code     SIMSBURY, CT  06070
                             ___________________________________________________
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                                     PART II
                             RULE 12B-25(b) AND (c)

     If the subject report could not be filed without unreasonable effort or
expense and the registrant seeks relief pursuant to Rule 12b-25(b), the
following should be completed. (Check appropriate box.)

|X|  (a) The reasons described in reasonable detail in Part III of this form
     could not be eliminated without unreasonable effort or expense;

|X|  (b) The subject annual report, semi-annual report, transition report on
     Form 10-K, 20-F, 11-K or Form N-SAR, or portion thereof will be filed on or
     before the 15th calendar day following the prescribed due date; or the
     subject quarterly report or transition report on Form 10-Q, or portion
     thereof will be filed on or before the fifth calendar day following the
     prescribed due date; and

|_| (c) The accountant's statement or other exhibit required by Rule 12b-25(c)
    has been attached if applicable.

                                    PART III
                                    NARRATIVE

     State below in reasonable detail the reasons why Form 10-K, 11-K, 20-F,
10-Q, N-SAR or the transition report portion thereof could not be filed within
the prescribed time period. (Attach extra sheets if needed.)

FORM 10-Q CAN NOT BE FILED WITHIN THE PRESCRIBED TIME PERIOD WITHOUT
UNREASONABLE EFFORT OR EXPENSE, BECAUSE OF THE REGISTRANT'S NEED FOR ADDITIONAL
TIME TO PROPERLY ACCOUNT FOR THREE BUSINESS ACQUISITIONS OCCURRING IN THE
REPORTING PERIOD.

                                     PART IV
                                OTHER INFORMATION

(1)      Name and telephone number of person to contact in regard to this
         notification

         RICHARD A. LAWRENCE                    (860)          843-7600
                 (name)                      (Area Code)   (Telephone Number)

(2)      Have all other periodic reports required under Section 13 or 15(d) of
         the Securities Exchange Act of 1934 or Section 30 of the Investment
         Company Act of 1940 during the preceding 12 months or for such shorter
         period that the registrant was required to file such report(s) been
         filed? If the answer is no, identify report(s).
                                                               |X| Yes    |_| No
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     (3) Is it anticipated that any significant change in results of operations
from the corresponding period for the last fiscal year will be reflected by the
earnings statements to be included in the subject report or portion thereof?
                                                                |_| Yes   |X| No

     If so: attach an explanation of the anticipated change, both narratively
and quantitatively, and, if appropriate, state the reasons why a reasonable
estimate of the results cannot be made.


                         ACCEL INTERNATIONAL CORPORATION
                  (Name of Registrant as Specified in Charter)

Has caused this notification to be signed on its behalf by the undersigned
thereunto duly authorized.

Date:  March 12, 2000                      By:  /s/ Richard A. Lawrence