AMSC N/A 1 of 8 FSC 5945
DISTRIBUTIO N STAT EMENT A. Approved for publ ic r elease; di str ibution i s unl imited.
INCH-POUND
MIL-R-83726/18G
15 June 2002
SUPERSEDING
MIL-R-83726/18F(USAF)
23 June 1995
DETAIL SPECIFICATI O N SHEET
RELAYS, HYBRID, TIME DELAY (ON RELEASE), TRACK MOUNTED,
TYPE IIA, CLASS B, 10 AMPERES, 2PDT, HERMETICALLY SEALED,
FI XED T IME, 0.1 TO 300 S E CONDS
This speci ficat ion i s approved for use by al l Depart ment s
and Agencies of the Depart ment of Defense.
The r equirements for acquiring the produc t described her ein shall
consist of this specificat ion and MI L- P RF-83726.
FI GURE 1. Dimensions and configuration.
Inactive for new design after 23 J une 1995.
No superseding document.
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MIL-R-83726/18G
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NOTES:
1. Dimensi ons are in inc hes.
2. Unless otherwise specified, toler anc e is ±.010 (0.25 m m).
3. Met r ic equivalents are gi ven for general i nfor mat ion onl y .
4. Ter minal numbers shall not appear on the rel ay header . There shall be a legible circuit
diagram on the rel ay whic h identifi es each t er minal locat ion speci fied.
5. For mount ing tr ac k , see MIL-PRF-12883/49. For br acket and socket assembly, see MIL-PRF-
12883/51.
6. Gasket material: Methylvinyl silicone; shore hardness A40.
7. Ter minal plating: S hall pr ovi de the operational , environmental, and interfac e c har acteristi c s to
provide a reliable interc onnec t to gold plated contac ts. Terminals shall be gold plated. One
system for gold pl ating that may be used is ASTM B488, type 3, c lass 1.25 with a nic k el
underplate of 50 to 150 microninches thick. The gold plating system shal l enabl e the product to
m eet the per for mance r equirements of this specific ation and shal l be approved by the quali fy ing
activity.
8. Enclosure finish color : FED- S TD-595, gr een 34449.
9. Coil suppressi on: Back E M F 42 V dc maximum.
10. Knob and post shall be ni c k el pl ated (100 mic r oinches thick mi nimum), 303 stainl ess steel.
FI GURE 1. Dimensions and configuration - Continued.
Inches mm
.001 0.03
.005 0.13
.015 0.38
.031 0.79
.040 1.02
.046 1.17
.060 1.52
.064 1.63
.078 1.98
.079 2.01
.094 2.39
.140 3.56
.200 5.08
.270 6.86
.313 7.95
.400 10.16
.800 20.32
1.025 26.04
1.250 31.75
2.118 53.80
2.707 68.76
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MIL-R-83726/18G
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FI GURE 1. Dimensions and configuration - Continued.
TABLE I. Dash numbers and tim e delay char ac teri stics.
Dash num ber 1/ 2/
Time delay (seconds) ±10% 3/
-1000 0.1
-1001 1.0
-5001 5.0
-1602 16.0
-6002 60.0
-1803 180.0
-3003 300.0
1/ Additional time delay relays within the 0.1- to 300-second
delay range are availabl e. To establish Part or Identify ing
num bers (PIN’s) not li sted in table I ( see “PIN” herein).
2/ PI N’s having a suf fix letter A foll owing the dash number
impose more stringent EM I requi r ement s than P IN’s with a
suffix letter W. For Government logi stical support the
suff ix ed PIN’s will be supplied (see “PIN” herein).
3/ Ten percent of t he nominal value under al l combi nations
of input voltage and envi r onment al extremes.
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MIL-R-83726/18G
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REQUIREMENTS:
Contact data:
Configurat ion: 2P DT.
Life/load rat ings: See t able II.
TABLE II. Life load ratings (relay c ase grounded) .
Amperes
Type of load
Life (cycles)
28 V dc 115/200
1 and 3 phase
400 Hz
Resistive 100,000 10 10
Inductive 20,000 8 8
Motor 100,000 4 4
Lamp 100,000 2 2
Mechanical life
(reduc ed c ur r ent) 400,000 2.5 2.5
Contac t voltage drop:
Initial: 0.150 vol t.
After lif e tests: 0.175 vol t.
Int erm ediate c ur r ent: Appli c able i n ac c or danc e wi th MIL- P RF-83536.
Contact bounce: 1 millisecond (max imum ).
Overload:
DC: 40 amperes.
AC: 60 amperes.
Ruptur e: 1/
DC: 50 amperes.
AC: 80 amperes.
Input data:
Duty rati ng: Continuous.
Maximum voltage ( over tem per ature range): 30 V dc.
1/ Not appli cable if tim e current r elay char ac teri stics at 25°C ar e r equired, or if the
MIL-PRF- 83536/9, / 10, /11 being used is qualified to MIL- P RF-83536.
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MIL-R-83726/18G
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Rated vol tage (over tem per ature range): 28 V dc.
Mi nimum vol tage (over tem per ature range): 20 V dc.
Mi nimum vol tage (hi gh- tem per ature test ) : 20 V dc.
Minimum voltage (continuous current tests): 20 V dc.
Maximum coil c ur r ent at 25°C: 0.150 am per e.
Operate time: 10 milliseconds (max imum).
Recycle time: 50 milliseconds m axim um (over the tot al temperature range and wit h both m ini mum
and m aximum input voltages). Relay will recycle if cont rol voltage i s removed from and reapplied
to the control t erminal C1 during the timing cycles.
Electr ical data:
Insul ation r esi stanc e at 500 V dc: 2/
Initial: 100 m egohms (mi nimum ) .
After lif e or envi ronmental tests: 100 megohm s (mi nimum ) .
Dielect ric str ength (sea level) : 2/
Initial After life tests
Coil to case. 3/ 1,050 V rms 1,050 V rms
All ot her points. 4/ 1,250 V rms 1,250 V rms
Dielect ric str ength (al titude)
(80,000 feet): 2/ 5/
Initial After life tests
Coil to case. 3/ 350 V rms 350 V rms
All ot her points. 4/ 350 V rms 350 V rms
Tr ansi ents (at ter minals X1, X2, and C1):
Tr ansi ent voltage limits (i nput): In accordanc e with MIL- S TD-461 (methods CS101, CS 114, RS101,
and RS103) for P IN’s with a suffi x lett er W. For PI N’s with a suffi x lett er A , the sam e li mits apply
ex cept that the field intensi ty limits for RS103 are as specified i n table III. Susceptibility testing shall
not cause t he r elay t o c hange state nor affect the tim ing i nterval beyond allowable toler anc e li mits.
2/ Terminals X1, X2 and C1 are connected together dur ing this test.
3/ Leakage current is lim ited to 50 m icroamperes.
4/ Leakage current is lim ited to 25 m icroamperes.
5/ Rel ay is not instal led i n its brack et and socket assembly (M IL-PRF - 12883/51-004).
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MIL-R-83726/18G
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TABLE III. RS103 level s for suffix lett er A P IN’s.
Frequency RS103 level
(volt/meter)
14 kHz to 200 MHz 20
200 MHz to 450 MHz 65
450 MHz to 1 GHz 20
1GHz to 12 GHz 100
Tr ansi ent voltage limits (output): In accordanc e with MIL- S TD-461 (methods CE106 and RE103) ,
voltage spikes generated by t ime delay r elays shall not ex c eed 42 volts duri ng the following time
periods starting at the instant of opening of the rel ay coil circuit:
PIN’s wit h a suffi x letter W: 50 microseconds.
PIN’s wit h a suffi x letter A: 500 mi croseconds.
Monitoring of spike vol tages shall be by a devic e ( such as a mem or y type oscilloscope) that c an detect,
m easure, displ ay , and record 0.25 to 1000 volts over the appli c able time durat ions specif ied herein.
Swit c hes used to cont r ol the time delay relays during voltage-spi k e measurements shall not be EMI
suppressed.
Time current rel ay c har ac teri stics at 25°C: 6/ Relay s shall sustain five applic ations (make and car r y
only) of power concurrently on adjacent poles at each of five different c ur r ent level s for the ti me
durations shown in table IV . Separat e r elays shall be tested at 28 V dc and 115/200 V ac, 400 Hz , 3
phase. Cool ing time between successive applicat ions shal l be 30 minutes. The t est shal l be perfor med
on both normall y open and nor mally c losed contacts of eac h r elay. There shall be no fai lures or
evidence of welding or sti c k ing, and r elays shall pass contac t voltage drop at conclusion.
TABLE IV. Tim e-current rel ay c har ac teri stics at 25°C.
1 15 A
1 hour
2 59 A
5.0 seconds
3 100 A
1.2 seconds
4 250 A
0.2 second
5 350 A
0.1 second
CAUTION: Compare wi th tim e-current
char ac teristic s of associated
circuit pr otective device.
Environmental data ( relay instal led i n br ac k et and socket assembly M12883/50 and secured in mount ing
track M12883/ 49.
Temperature range (oper ating) : -70°C to +125°C.
Maximum altitude rating: 80,000 feet.
6/ Not appli cable if the MIL-PRF-83536/9, /10, /11 rel ay being used is qualifi ed to the t ime current rel ay
charac teri stics at 25°C requirements of MI L- P RF-83536.
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MIL-R-83726/18G
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Shock G level: 50 g’s.
Duration: 10 milliseconds .
M aximum duration contac t opening: 10 m icroseconds.
M aximum duration contac t cl osi ng: 1 m icrosecond.
Vibration (sinusoidal):
G level: 30 g’s.
Frequency range: 10 Hz to 3,000 Hz.
Vibration (random): Appl icable in ac c or danc e with MIL-STD- 202, m ethod 214, t est c ondition 1B.
Power spectral density : 0.4 g2/Hz.
Fr equenc y r ange: 50 Hz to 2,000 Hz.
Duration: 15 minutes each plane.
Acceleration: 15 g’s.
Seal: Applicable to nonhermetical ly-seal ed r elays and hermetical ly-sealed (potted) relays.
Physi c al data:
Dimensi ons and configuration: S ee figure 1.
Weight: 0.34 pound (.153 ki logram) maxi mum.
Knob strength: T he r od to knob j unc tion shal l be capable of resisting an ax ial pull of 35 pounds wit hout
degradation.
Mark ing: S ee M IL-PRF - 83726. In addition, relays shall be mar k ed with the ES DS identifi er as
specified in MIL-STD-1285.
ESDS protection program: Th e man ufacturer shall establish an d maintain an ESD control program in
accordance with MIL-STD-1686 for mission critical equipment. Evi dence of such compliance shall be verified
by the qualifying activity of this specification as a prerequisite for qualification and continued qualification. This
program shall be documented by an ESD con trol plan that must be under document control. As a minimu m,
this plan must address the iden tification of ESDS sub-components and preservation, packaging, an d quality
assurance. A model ESD control program is availabl e from the qualifying activity and may be u sed as a
guideline. Fu rther gui dance for ESD control is avail able from the EDS/ESD Association and th e El ectronics
Indus try Association (EIA). Thi s requirement is appli cable to all manufacturers who hand le ESDS component
parts and materials in th e relay manufacturing or testing process. This requirement is not limited to
manu facturers qualifying ESDS end items .
ESDS verification: As a part of qual ification or qualification after redesign, ESD testing shall be done in
accordance with method 3015 of MIL-STD-883 modified to test at 16,000 volts. Testing at lower voltage
levels is not required. This testing shall be accomplished as part of the group III for qualification inspection and
as part of the group C inspection .
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MIL-R-83726/18G
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ESDS pr eservation and packaging: Relays shall be preserved and packaged in such a m anner as to
ensure that the integri ty of ESD sensit ive r elays is not diminished. ESD sensitive relays shal l be
preserved and pac k aged in accor danc e with the requirements of MI L-STD- 1686.
PIN: Consists of the prefix M83726/18- , a four-digit dash number ( expressed in milliseconds), and a
suffix letter ( indicating the extent of EMI requir ement s) as follows:
M
83726/18- 1001 A
Military designator
Specific ation sheet number
The first t hr ee digi ts are si gnifi c ant;
the fourth digit is the number of zer os to
follow the first three digi ts. The t ime is
expressed in milliseconds and convert ed to
seconds. (See examples fol lowing table V. )
Suffi x letter 7/
Examples:
M83726/18-1000W-100 millisecond tim e delay, with less stri ngent EMI r equirements.
M 83726/18-1001A- 1 second t ime delay , wi th m or e str ingent E M I requi rements.
Quality assurance provisions: G r oup B and gr oup C testing ar e not required. The
m anufac turer shal l notify t he quali fy ing act ivity in the event of any desi gn or c onst r uc tion
changes, and shall i mpose additional testing requirements as necessar y .
The Q ualif ied Pr oduc ts List (Q P L) associated with this i nac tive for new desi gn specific ation
will be maintained until acquisit ion of the pr oduc t is no l onger r equired, whereupon the
specificat ion and the QPL will be canceled.
Custodian: Preparing activity:
Navy - E C DLA - CC
Air force - 11
DLA - CC
Review acti vi ties: (Pr oject 5945- 1167- 03)
Air For c e 99
7/ Any relay s numbered prior to the date of t his specific ation with a suffix indicat ion shall be considered
interchangeable (store and issue) wit h the W for r elays wi th less str ingent E M I requi r ement s (Y ,X) or
A for relays with more str ingent E M I requi r ement s (B ,C).
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