SCHEDULE 13G 
 
Amendment No. 2 
Esco Electronics Corporation 
common stock trust receipt 
Cusip # 269030201 
Filing Fee: No 


Cusip # 269030201 
Item 1:	Reporting Person - FMR Corp. - (Tax ID:  04-2507163) 
Item 4:	Commonwealth of Massachusetts 
Item 5:	8,600 
Item 6:	None 
Item 7:	63,200 
Item 8:	None 
Item 9:	63,200 
Item 11:	0.57% 
Item 12:	HC  
 
 


Cusip # 269030201 
Item 1:	Reporting Person - Edward C. Johnson 3d - (Tax ID:  029-24-9996) 
Item 4:	United States of America 
Item 5:	None 
Item 6:	None 
Item 7:	63,200 
Item 8:	None 
Item 9:	63,200 
Item 11:	0.57% 
Item 12:	IN  
 
 


SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
 
 
Item 1(a).	Name of Issuer: 
 
		Esco Electronics Corporation 
 
Item 1(b).	Name of Issuer's Principal Executive Offices: 
 
		8100 West Florrisant Avenue  
		St Louis, MO  63136 
 
Item 2(a).	Name of Person Filing:  
 
		FMR Corp. 
 
Item 2(b).	Address or Principal Business Office or, if None, Residence: 
 
		82 Devonshire Street, Boston, Massachusetts  02109 
 
Item 2(c).	Citizenship: 
 
		Not applicable 
 
Item 2(d).	Title of Class of Securities: 
 
		Common Stock Trust Receipt 
 
Item 2(e).	CUSIP Number:   
 
		269030201 
 
Item 3.	This statement is filed pursuant to Rule 13d-1(b) or 13d-2(b) and the 
person filing, FMR Corp., is a parent holding company in accordance 
with Section 240.13d-1(b)(ii)(G).  (Note:  See Item 7). 
 
Item 4.	Ownership 
 
	(a)	Amount Beneficially Owned:
	63,200 
 
	(b)	Percent of Class:
	0.57% 
 
	(c)	Number of shares as to which such person has:   
 
	(i)	sole power to vote or to direct the vote:
	8,600 
 
	(ii)	shared power to vote or to direct the vote:
	None 
 
	(iii)	sole power to dispose or to direct the disposition of:
	63,200 
 
	(iv)	shared power to dispose or to direct the disposition of:
	None 
 
 


Item 5.	Ownership of Five Percent or Less of a Class. 
 
	If this statement is being filed to report the fact that as of 
the date hereof, the reporting person has ceased to be the 
beneficial owner of more than five percent of the class of 
securities, check the following (X). 
 
Item 6.	Ownership of More than Five Percent on Behalf of Another Person. 
 
	Not applicable. 
 
Item 7.	Identification and Classification of the Subsidiary Which Acquired 
the Security Being Reported on By the Parent Holding Company. 
 
	See attached Exhibit(s) A, B, and C. 
 
Item 8.	Identification and Classification of Members of the Group. 
 
	Not applicable, see attached Exhibit A.  
 
Item 9.	Notice of Dissolution of Group. 
 
	Not applicable. 


Item 10.	Certification. 
 
	Inasmuch as the reporting persons are no longer the beneficial 
owners of more than five percent of the number of shares 
outstanding, the reporting persons have no further reporting 
obligation under section 13(d) of the Securities and Exchange 
Commission thereunder, and the reporting persons have no 
obligation to amend this Statement if any material change 
occurs in the facts set forth herein. 
 
 
Signature 
 
	After reasonable inquiry and to the best of my knowledge and 
belief, I certify that the information set forth in this 
Schedule 13G in connection with FMR Corp's beneficial ownership 
of the common stock trust receipt of Esco Electronics 
Corporation at July 31, 1994 is true, complete and correct.  
 
 
 
	August 3, 1994	 
Date 
 
 
 
	/s/Arthur S. Loring 
Signature 
 
 
 
	Arthur S. Loring, Vice 
President	 
Name/Title 
 
 


SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
 
	Pursuant to the instructions in Item 7 of Schedule 13G, Fidelity 
Management & Research Company ("Fidelity"), 82 Devonshire Street, Boston, 
Massachusetts 02109, a wholly-owned subsidiary of FMR Corp. and an investment 
adviser registered under Section 203 of the Investment Advisers Act of 1940, 
is the beneficial owner of 54,600 shares or 0.50% of the common stock trust 
receipt outstanding of Esco Electronics Corporation ("the Company") as a 
result of acting as investment adviser to several investment companies 
registered under Section 8 of the Investment Company Act of 1940.   
 
	Edward C. Johnson 3d, FMR Corp., through its control of Fidelity, and the 
Funds each has sole power to dispose of the 54,600 shares owned by the Funds. 
 
	Neither FMR Corp. nor Edward C. Johnson 3d, Chairman of FMR Corp., has 
the sole power to vote or direct the voting of the shares owned directly by 
the Fidelity Funds, which power resides with the Funds' Boards of Trustees.  
Fidelity carries out the voting of the shares under written guidelines 
established by the Funds' Boards of Trustees. 
 
	Edward C. Johnson 3d owns 24.9% of the outstanding voting common stock of 
FMR Corp.  Mr. Johnson 3d is Chairman of FMR Corp.  Various Johnson family 
members and trusts for the benefit of Johnson family members own FMR Corp. 
voting common stock.  These Johnson family members, through their ownership of 
voting common stock, and the execution of a family shareholders' voting 
agreement, form a controlling group with respect to FMR Corp. 
 
	Fidelity International Limited, Pembroke Hall, 42 Crowlane, Hamilton, 
Bermuda, and various foreign-based subsidiaries provide investment advisory 
and management services to a number of non-U.S. investment companies (the 
"International Funds") and certain institutional investors.  Fidelity 
International Limited is the beneficial owner of 8,600 shares or 0.08% of the 
common stock trust receipt outstanding of the company.  Additional information 
with respect to the beneficial ownership of Fidelity International Limited is 
shown on Exhibit B, page 9. 


SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
 
 
	Pursuant to instructions in Item 7 of Schedule 13G, this Exhibit has been 
prepared  to identify Fidelity International Limited, Pembroke Hall, 42 Crow 
Lane, Hamilton, Bermuda, a Bermudian joint stock company incorporated for an 
unlimited duration by private act of the Bermuda Legislature (FIL) and an 
investment adviser to various investment companies (the "International Funds") 
and certain institutional investors, as a beneficial owner of the 8,600 shares 
or 0.08% of the common stock trust receipt outstanding of Esco Electronics 
Corporation. 
 
	Prior to June 30, 1980, FIL was a majority-owned subsidiary of Fidelity 
Management & Research Company (Fidelity), a wholly-owned subsidiary of FMR 
Corp.  On that date, the shares of FIL held by Fidelity were distributed, as a 
dividend,  to the shareholders of FMR Corp.  FIL currently operates as an 
entity independent of FMR Corp. and Fidelity.  The International Funds and 
FIL's other clients, with the exception of Fidelity and an affiliated company 
of Fidelity, are non-U.S. entities. 
 
	A partnership controlled by Edward C. Johnson 3d and members of his 
family owns shares of FIL voting stock with the right to cast approximately 
47.22% of the total votes which may be cast by all holders of FIL voting 
stock.  Mr. Johnson 3d is Chairman of FMR Corp. and FIL.  FMR Corp. and FIL 
are separate and independent corporate entities.  FMR Corp. and FIL are 
managed independently and their Boards of Directors are generally composed of 
different individuals.  Their investment decisions are made independently, and 
their clients are different organizations. 
 
	FMR Corp. and FIL are of the view that they are not acting as a "group" 
for purposes of Section 13(d) under the Securities Exchange Act of 1934 (the 
"1934" Act) and that they are not otherwise required to attribute to each 
other the "beneficial ownership" of securities "beneficially owned" by the 
other corporation within the meaning of Rule 13d-3 promulgated under the 1934 
Act.  Therefore, they are of the view that the shares held by the other 
corporation need not be aggregated for purposes of Section 13(d). However, FMR 
Corp. is making this filing on a voluntary basis as if all of the shares are 
beneficially owned by FMR Corp. and FIL on a joint basis. 
 
	FIL may continue to have the International Funds or other accounts 
purchase shares subject to a number of factors, including, among others, the 
availability of shares for sale at what FIL considers to be reasonable prices 
and other investment opportunities that may be available to the International 
Funds. 
 
	FIL intends to review continuously the equity position of the 
International Funds and other accounts in the Company.  Depending upon its 
future evaluations of the business and prospects of the Company and upon other 
developments, including, but not limited to, general economic and business 
conditions and money market and stock market conditions, FIL may determine to 
cease making additional purchases of shares or to increase or decrease the 
equity interest in the Company by acquiring additional shares, or by disposing 
of all or a portion of the shares. 
 
	FIL does not have a present plan or proposal which relates to or would 
result in (i) an extraordinary corporate transaction, such as a merger, 
reorganization, liquidation, or sale or transfer of a material amount of 
assets involving the Company or any of its subsidiaries, (ii) any change in 
the Company's present Board of Directors or management, (iii) any material 
changes in the Company's present capitalization or dividend policy or any 
other material change in the Company's business or corporate structure, (iv) 
any change in the Company's charter or by-laws, or (v) the Company's common 
stock becoming eligible for termination of its registration pursuant to 
Section 12(g)(4) of the 1934 Act. 
 
	FIL has the sole power to vote and the sole power to dispose of 8,600 
shares.   


SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
 
RULE 13d-1(e)  AGREEMENT 
 
	The undersigned persons, on August 3, 1994, agree and consent to the 
joint filing on their behalf of this Schedule 13G in connection with their 
beneficial ownership of the common stock trust receipt of Esco Electronics 
Corporation at July 31, 1994. 
 
	FMR Corp. 
	By	/s/Arthur S. Loring 
Arthur S. Loring
Vice President - Legal 
		Edward C. Johnson 3d 
	By	/s/Arthur S. Loring 
Arthur S. Loring
Under Power of Attorney dated 
5/17/89
On File with Schedule 13G for
Airborne Freight Corp. 9/10/91 
	Fidelity Management & Research Company 
	By	/s/Arthur S. Loring 
Arthur S. Loring
Sr. V.P. and General Counsel