1、. MIL-S-1837bD 57 7777706 0017188 2 MIL-S-18396D (SHIPS) SUPERSEDING MIL-S-18396C (SHIPS) 10 July 1973 31 July 1962 (See 6.6) ?1ILITARY SPECIFICATION SWITCHES, !.IETER AND CONTROL , NAVAL SHIPBOARD 1. SCOPE 1.1 SCO e. This specification covers the requirements for rotary type, class High- Impact (II
2、.?%hockproof switches used in meter and control circuits for Naval shipboard applications. t 1.2 Classification. The switches covered by this specification shall be of the following types, as specified (see 6.2.1): Type MC - for use in both meter and control applications. Type MO - for use in meter
3、applications only. 1.2.1 Ratings. The switches shall have the following ratings, as specified (see 6.2.1): Type FlC Make and break: 20 amperes, 125 volt alternating current (a.c.) (60 or 400 hertz (Hz). 10 amperes, 250 volt a.c. (60 or 400 Hz). 5 amperes, 500 volt a.c. (60 or 400 Hz). 0.4 amperes, 3
4、55 volt direct current (d.c.). Carry - 20 amperes, all rated voltages. Type !O Make and break (inductive) : 10 amperes, 120 volt a.c. (60 or 400 Iiz). 3 amperes, 450 volt a.c. (60 or 400 Hz). Carry - 10 amperes, all rated voltages. 1.2.2 Switch characteristics. 1.2.2.1 Switch actuation. Switch actua
5、tion shall be of the following types, as specified (see6.2;r) : (a) Spring return (momentary action). (b) Detent action (nonspring return). (c) Push-pull. 1.2.2.2 Switch circuitr . The switch circuitry shall be as follows and as specified (see 6.2.1). as a minimum: T-formationshall be included in th
6、e drawings (see 3.10) and shall include (a) Detailed circuit options. (b) Number of switch positions. (c) Number of poles. (d) Shorting or nonshorting contacts. (e) Location of switch stous; if required. 1.2.3 Switch handles. Operating handles shall be of the following shapes, as speci- fied (see 6.
7、2.1): - (a) Round (plain). (b) Round (knurled). (c) Oval. (d) Pistol grip or lever. FSC 5930 THIS DOCUMENT CONTAINS. General Requirements for. MILITARY XIL-!.I-14 - !folding Plastics and Eiolded Plastic Parts, Thermosetting. MIL-S-901 - Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment
8、 XIL-E-917 - Electrical Power Equipment, Basic Requirements or (Naval Ship- MIL-0-1000 - Drawings, Engineering, and Associated Lists. MIL-D-1000/2 - Drawings, Engineering, and Associated Lists. MIL-P-15024 - Plates, Tags and Bands for Identification of Equipment. MIL-P-15024/5 - Plates, Identificati
9、on, MIL-E-17555 - Electronic and Electrical Equipment, Accessories, and Repair :lIL-1-45208 - Inspection System Requirements. and Systems, Requirements for. board Use). Parts; Packaging and Packing of. STANDARDS MILITARY tIL-STD-i30 - Identification !.larking of U.S. tlilitary Property. HIL-STD-i67
10、- :lechanical Vibrations of Shipboard Equipment. ?IL-STD-202 - Test Hethods for Electronic and Electrical Component Parts. I4IL-STD-454 - Standard General Requirements for Electronic Equipment. MIL-STD-1285 - larking of Electrical and Electronic Parts. in connection with specific procurement functio
11、ns should be obtained from the procuring activity or as directed by the contracting officer.) (Copies of specifications, standards, drawings, and publications required by suppliers 3. REQUIRESENTS 3.1 Qualification. Switches furnished under this specification shall be products which are qualified fo
12、r listing on the applicable qualified products list at the time set for opening of bids (see 4.3 and 6.4). 3.2 Definitions. 3.2.1 Switch. A switch is a device for making, breakinq, or changing the connections in an electric circuit. 3.2.2 Meter switch. The metcr switch is used to connect or disconne
13、ct a meter in an electric circuit, ortransfer the miter from one circuit or phase to another. power-operatemcza circuit or to transfer the device froa one circuit to another. # 3.2.3 Control switch. The control switch is Used to connect or disconnect electric # 3.2.4 Contact rating. # 3.2.4.1 Xake a
14、nd break. The rating of the switch which describes its ability to make or break an electric circuit for the rated life of the switch without damage. It is described both in amperes and volts. # 3.2.4.2 Continuous current rating. The maximum d.c. or root sean square (r.m.s.1 current in amperes, at ra
15、ted frequency, which the switch will carry continaously without exceeding the specifie linits of observable tefipcrature rise in onen air. # 3.2.5 Shorting contacts (niake ?e,Forc break). “ontacts that close the circuit in the next switching position before openin? the sircuit ir! the nresent nositi
16、on. R 3.2.6 Nonshorting contacts (break before naice. :nr.tacts thiit i-tcrru-t the circuit in the present switch position prior to complctinC3 _!IC Cirzait in ti! next position. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-# 3.3 Detail requirem
17、ents (applicable to individual switc!ies). The detail requirements shall be inconformance with this specification and as specified on the applicable drawing (see 3.10). 3.4 General requirements. # 3.4.1 gaterials. Materials shall be as specified herein. Any materials not specified shall be selected
18、from those listed in MIL-E-917. Even though constituent material is accepted, the finished switch shall comply with all requirements specified herein and perform its intended functions. # 3.4.1.1 Plastics. All molded parts except handles (see 3.5.1.5) and position identi- fication plates (see 3.5.5)
19、 shall be made of molded insulating material, type !VLT 30, .%I 60, MAI 30, GDI 30F or .LM1 30 of NIL-!4-14. Laminated materials shall be of the type specified in XIL-E-917, with a temperature index of 13OOC (266OF) or higher. to resist corrocionas specified in IlIL-E-917. selected to comply with th
20、erequirements of HIL-E-917. # 3.4.1.3 Current carr in arts. Nonferrous materials shall be used for current carry- ing parts. surfaces, shall be faced with silver. Silver plating, when used, shall be in accordance with QQ-5-365, minimum thickness of 0.0002 inch. If silver overlay, or similar construc
21、tion is used, the silver material shall be not less than 0.003 inch thick. 11 3.4.1.2 !fetals. Metals shall be of the corrosion-resistant type or shall be treated II 3.4.1.2.1 Dissimilar metals. Dissimilar metals in contact with each other shall be Al-ct su:faze%current carrying parts , including th
22、eir connection # 3.5 oesign and construction. The switches shall be of the design, construction and physical dimensioncas suecified (see 3.3). 3.5.1 Parts. i 3.5.1.1 Threaded partc. Threaded parts shall be in accordance with MIL-E-917. Current carrying threaded parts shall be silver plated in accord
23、ance with QQ-C-365, minimum thickness of 0.0002 inch. 3.5.1.2 Terminals. Nonferrous terminal posts or binderhead screws shall be furnished for all connections. Terminals shall conform to requirement 19 of 3IL-STD-454. # 3.5.1.3 Contacts. Contacts shall be of simple and rugged construction. The conta
24、cts shall have wipe action and shall be of such type that no adjustnents are required to com- plete the endurance test (see 4.7.7.1). Contacts shall be shorting or nonshorting, as specified (see 6.2.1). c 3.5.1.4 Springs and hinges. Springs and hinges shall not be depended upon to carry current. # 3
25、.5.1.5 O eratin handles (knobs). Operatinq handles shall be molded plastic, type CFI-5, in acco-th MIL-?.1-14. The handle finish shall be smooth and free of flash. The handle shape shall be as specified (see 1.2.3 and 6.2.1). .letal fastening devices securing the handle to the operating shaft shall
26、not come in contact with the operators hand mechanism ana the switching contacts are fully enclosed (except terminals), to prevent foreign matter from entering the switch mechanism or interfering with the contacts. Covers may be used as a means of satisfying this requirement. 3.5.2 Construction. Swi
27、tches shall be of closed construction so that the switching li 3.5.3 Creepage clearance distances. # 3.5.3.1 Type W. Switches shall be in accordance with :lIL-L-917. External parts shall meet the requGements for set C spacings, “open creepage“, and internal parts shall meet the requirements for set
28、C spacings, “enclosed crccoi4e“. lounting screws and operating shafts shall be considered ground. set B spacings challe met. li 3.5.3.2 TE MO. The same requirements apply as for the tyne IC switch, except that 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fro
29、m IHS-,-,- - _ - MIL-S-18396D (SHIPS) 3.5.4 Operational requirements. .# fl # # B A # # # i # i # # 3.5.4.1 Ambient temperature. Switches shall be designed for operation in a 65OC (149F) ambient. 3.5.4.2 Indexin . Switches shall have a positive detent or indexing mechanism, locating each switch :osi
30、tion, except when a spring return action is specified (see 6.2.1). The positive detent or indexing mechanism shall be designed to minimize the possibility of the movable elements coming to rest between positions. shall return to the specified fixed position when the operating force is removed and th
31、e movable element shall come to rest in a positive detent position (see 4.7.1). required to rotate the shlterials, manufacturers identification, and specifications (where applicable). (c) The drawings shall delineate the possible variations in number of switch positions; the number of switching sect
32、ions: momentary, push-pull and detent action: shorting and nonshorting contact types: the type of knobs available. (d) The drawinas shall include in chart form the weight of a switch, the weight of a set of repair parts, and torque, as well as length dimensions, for switches having different numbers
33、 of switching decks. The drawings shall also show the maximum number of switching decks that can be used and still meet the high impact shock and vibration requirements with and without rear support. the name of each iten, the quantity of each item recommended for a set of repair parts (on a per swi
34、tch basis), the manufacturers ordering identifi- cation for the iten. (e) A list of repair parts and special tools with piece number for each item, (f) Switch rating. (9) List of exceptions to this specification. # 3.10.1 Prior to authorization of qaalification tests, drawings shall be slibmitted to
35、 NAVSEC for review. 4. QUALITY ASSURANCE PROVISIOSS # 4.1 Res onsibilit for ins ection. Unless otherwise specified in the contract or purchase orde:, the suposition rrit!i test voltage aDplied between each princiual circuit and grounled metal parts and between each principal circuit and all other nr
36、incinal circuits. (c) The test voltage shall bc acplic or li srconds. 4.7.5 Tem erature rise (sne 3.5.1.7). The tczncrature risi OP ths switch stationary contacts, boltez conncctK an2 terninxl ntlils nr.nrii;.n:i .2urincr tie elcctrical endurance tests shall be determined by nc-tns OP tnir?ocoupls o
37、f wirr! nsae (25-37 AViG). The temperature sensitive elements shall be r;Lacd on th- crirrent carryinq mrts where they 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ii I ,31L-S-18 39 6D (SHIPS) first emerge from the switch body. Tenpcraturc mcasu
38、renents clin11 be takon prior to, during, and immediately followinq the electrical enurancc test. The temPerature rise measurements during the electrical endurancc test shall be takpn after the first 50,000 cycles of operation, while the switches are in the 65OC (149OF) ambient tenperature. The cont
39、acts shall be the same as those that were used for the overload and endurance tests, and shall be energized at the “carry“ ratinq at any convenient voltage within the switch rating. Temperature measurements shall be taken at half hour intervals until three successive measurements are within pius or
40、minus 1OC. Switch wiring shall be size 1G for 5 amperes or less and size 14 in excess of 5 amperes (20 amperes maximum). The cable length from load on supply to the switch shall be 3 feet plus 1 inch, minus O inch. If enclosures or covers are provided as part of the switch, the test shall be made wi
41、th the enclosures or covers properly mounted to the switch. It 4.7.6 Overload. The switches shall be operated for 50 operations to interrupt 150 percent of the maximum rated current at the voltage for that rating. The circuit shall provide for “on-off switching and one operation shall consist of thr
42、owing the switch from the “off“ position to the “on“ position and returning to the “off“ position. TWO pairs of contacts shall be used for each electrical rating subsequently tested in the electrical endurance test and shall be the same ones used for the endurance and the overload tests. The test ra
43、te shall be two operations oer minute and the duty cycle shall be 50 percent on and 50 percent off. The wiring for the test shall be the same as for the endurance test. 4.7.7 Endurance (see 3.5.4.3). # 4.7.7.1 Electrical. The contacts tested shall be used to determine the suitability of the switch t
44、o make, break, and carry each of the current/voltaqe ratings specified for the switch. The a.c. tests shall be conducted at a 0.75 to 0.80 lagging power factor (p.f.). The contacts shall be distributed uniformly over the entire length of the switch. Nonshorting contacts shall be used for interruptin
45、g ratings and shorting contacts shall be used or the maximum carry rating. The switch shall be subjected to lOO,Or) cycles of operation. The first 50,000 cycles of operation shall be performed with the switches exposed to an ambient temperature of 65 + 3OC. The last 50,000 cycles of operation shall
46、be performed at room ambient conditions: A cycle of operation is define8 as one electrical make and break of each contact. The cycling rate shall be a minimum of 6 cycles of operation per minute, with a minimum of a 50 percent duty cycle. Switches shall be monitored to determine when any loaded cont
47、acts fail to open or close in proper sequence. 1: 4.7.7.2 t4echanical. The switch shall be operated without electrical load for 10,000 cycles of operation. A cycle of operation is defined as u complete rotation of the switch shaft through all switch positions. Where the switch has removable stops, t
48、he stops shall be removed and a cycle of operation shall be the fll 360 degrees. Where the switch has nonremovable stops, the rotation of the shaft from the fully counterclockwise position to the fully clockwise position and return shall constitute two cycles of operation. The cycling rate shall be
49、at any convenient sneed. il 4.7.8 Contact resistance (see 3.5.4.10). Contact resistance of each pole subjected to the electrical endurance test and each polc subjected to the mechanical endurance test shall be determined in accordance with niet!iod 3n7 of :.IIL-STD-2n?. The followinq details shall apply: (a) Test leads shall be connected by a method suitable for tbc switch terminals. (b) Contact resistance as indicated !J! thc millivolt dron shall be measured (c) Contact resistance as indicate
