1、AMSC N/A FSC 5945 INCH-POUND MS27749F 17 September 2012 SUPERSEDING MS27749E 27 November 2003 DETAIL SPECIFICATION SHEET RELAYS, ELECTROMAGNETIC, 60 AMPERES, 3 PDT MAGNETIC LATCH, HERMETICALLY SEALED INACTIVE FOR NEW DESIGN AFTER 15 NOVEMBER 2002. NO SUPERSEDING SPECIFICATION. This specification is
2、approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the relay described herein shall consist of this specification and the latest issue of MIL-PRF-6106. FIGURE 1. Dimensions and configuration. Provided by IHSNot for ResaleNo reproduction or n
3、etworking permitted without license from IHS-,-,-MS27749F 2 Inches mm .002 0.080 .005 0.127.010 0.254 .100 2.540.170 4.380 .203 5.156.375 9.525 .437 11.100 1.910 48.514 2.000 50.800 2.440 61.976 2.450 62.230 2.500 63.500 3.130 79.502 NOTES: 1. Dimensions are in inches. 2. Unless otherwise specified,
4、 tolerance is .031 (0.79 mm). 3. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence. 4. Relay is magnetically latched in both positions. 5. Coils are not to be energized simultaneously (unless connec
5、ted series aiding). 6. Metric equivalents are given for general information only. MS part number Type Coil Terminal type Mounting Max weight in pounds 1/ MS27749-1 I dc Stud Plate .875 MS27749-2 I dc Stud Plate .9381/ Weight includes terminal barriers. FIGURE 1. Dimensions and configurations - Conti
6、nued. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS27749F 3 REQUIREMENTS: Contact data: Load ratings: See table I and table III. Initial contact voltage drop: 0.150 volt. After life test: 0.175 V. Overload current: 50 amperes dc; 80 amperes ac.
7、Rupture current: 60 amperes dc; 100 amperes ac. Coil data: See table II. Duty rating: Continuous. Electrical data: Insulation resistance: Initial: 100 megohms. After life or environmental test: 50 megohms. Dielectric withstanding voltage: Sea level: Initial After life tests Coil to case 1,000 1,000
8、Aux contacts N/A N/A All other points 1,250 1,000 Altitude: 80,000 ft 300,000 ft Coil to case 350 500 Aux contacts N/A All other points 350 500 Environmental characteristics: Temperature range: -70C to +125C. Maximum altitude rating: 300,000 feet. Shock g-level: 200 gs. Duration: 6 ms. Max duration
9、contact opening: 10 s. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS27749F 4 Vibration - sinusoidal: G-level 30 gs. Frequency range 10 - 3,000 Hz. Vibration - random: Applicable specification: MIL-STD-202, method 214. Test condition: IG. Duratio
10、n: 15 minutes each plane. Acceleration 15 gs. Physical data: Dimensions and configurations: See figure 1. Weight: 0.938 pound maximum. Part or Identifying Number (PIN): MS27749- (dash number from table II). Qualification by similarity: See MIL-PRF-6106. TABLE I. Rated contact load (amperes per pole)
11、 case grounded. Type of load Life operating cycles x 10328 V dc 115 V ac, phase 115/200 V ac, 3 phase 1/ See appropriate notes Main Aux Main Aux Main Aux NO NC NO NC 400 Hz 60 Hz 400 Hz 60 Hz 400 Hz 400 Hz 60 Hz Resistive 2/ 50 25 25 25 25 Inductive 10 12 12 Inductive 20 15 15 Motor 50 10 10 10 10 L
12、amp 50 5 5 5 5 Transfer load - - - 3/ Mechanical life reduced current 200 6 6 6 6 Mixed loads Applicable per specification 1/ Absence of value indicates relay is not rated for 3 phase applications. 2/ For full rated load, temperature, and altitude, use number 12 wire or larger. Relays shall be mount
13、ed so that mounting bracket temperature is limited to +135C maximum. 3/ Transfer load indicates relay is suitable for transfer between unsynchronized ac power supplies at rating indicated. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS27749F 5 Ta
14、ble II. Operating characteristics. Part no. MS 27749- Coil data Time - (milliseconds maximum) Coil Nominal Max at +25C Max pick-up voltage Drop out volt- age 2/ Oper-ate 3/ Rel-ease 4/ Contact Bounce Volts 1/ Freq Hz Res 10% Volts Amp Nor- mal 2/ High temptest Cont cur-rent test Main Aux NO NC NO NC
15、 1 X1,X2 28 dc 200 29 .190 18 20 21 N/A 35 - 3 3 - - 2 Y1, Y2 28 dc 200 29 .190 18 20 21 N/A - 35 3 3 - - 1/ Contact transfer time rated voltage, 1.8 milliseconds minimum. 2/ Over the temperature range. 3/ With nominal coil voltage. 4/ From nominal coil voltage. TABLE III. Rated contact load (ampere
16、s per pole) case grounded. Type of load Life operating cycles x 10328 V dc 115 V ac, 1 phase 115/200 V ac, 3 phase 1/ See appropriate notes Main Aux Main Aux Main Aux NO NC NO NC 400 Hz 60 Hz 400 Hz 60 Hz 400 Hz 60 Hz 400 Hz 60 Hz Resistive 50 50 50 60 60 Inductive 20 20 20 Inductive 50 60 60 Motor
17、50 20 20 40 40 Lamp 50 10 10 15 15 Transfer load 10 12.5/ 60 12.5/ 60 2/ Mechanical life reduced current 200 7 7 14 14 2/ Mixed loads 50 1 1 5 5 1/ Absence of value indicates relay is not rated for 3 phase applications. 2/ Transfer load indicates relay suitable for transfer between unsynchronized ac
18、 power supplies at rating indicated. 12.5 amps for -1, 60 amps for -2. APPLICATION, NOTES: 1. Examination of product, external parts shall be performed in accordance with MIL-PRF-6106, except the case temperature shall be limited to 150C maximum. 2. Strength of terminals, shall be performed in accor
19、dance with MIL-PRF-6106, except it shall be tested at room ambient temperature only. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS27749F 6 ENVIRONMENTAL CHARACTERISTICS Temperature range 55C to +71C. Max altitude rating 50,000 ft. Shock G-level
20、50g. Duration 6 ms. Max duration contact opening 10 s. Vibration: Sinusoidal: G-level 10 g. Frequency range 70-2,000 Hz. Nonoperate G-level 15 g. Frequency range 20-2,000 Hz. Acceleration 15 g. ELECTRICAL CHARACTERISTICS Insulation resistance, initial 100 megohms. After life or environmental tests 5
21、0 megohms. Dielectric strength (sea level) Initial After life tests Coil to case 1,000 V rms 1,000 V rms Aux contacts N/A N/A All other points 1,500 V rms 1,150 V rms Dielectric strength (altitude). 50,000 ft Coil to case 500 V rms Aux contacts N/A All other points 700 V rms Max contact drop initial
22、 .150 volt. After life test .175 volt. Overload current 125 A dc; 115/200 A ac; Rupture current 150 A dc; 115/200 Vac; 400 Hz 500 A Duty rating Continuous. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS27749F 7 Conformance inspection: Performance
23、 of groups B and C tests may be suspended at the discretion of the qualifying activity. Qualification by similarity: See MIL-PRF-6106. Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made. This was d
24、one as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last pr
25、evious issue. Referenced documents. In addition to MIL-PRF-6106, this document references the following. : MIL-STD-202 Custodians: Preparing activity: Air Force - 85 DLA - CC DLA CC Review activities: Air Force - 99 (Project 5945-2012-030) NOTE: The activities listed above were interested in this do
26、cument as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at https:/assist.dla.mil/. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
