SERIES KM
ENGINEERING DATA SHEET
RELAY - NONLATCH
1 PST-DM, 50 AMP
All welded construction
Contact arrangement
Designed to the
performance standards of
1 PST NO-DM Configuration in one
inch cube
MIL-PRF-6106
PRINCIPLE TECHNICAL CHARACTERISTICS
Contacts rated at
Weight
Dimensions
28 Vdc
0.188lb max
1.025in x 1.025in x 1.66in
Hermetically sealed, corrosion resistant metal can.
Detail specifications and ordering data appear on the following
pages.
APPLICATION NOTES:
101
102
007
CONTACT ELECTRICAL CHARACTERISTICS
Contact rating per pole
and load type [1]
Resistive [2]
Inductive [3]
Motor [3]
Lamp [3]
Overload
Rupture
Load current in Amps
@28 Vdc
Resistive
Inductive
Motor
Lamp
Overload
Rupture
No Load Designator
50
15 [3]
8 [3]
-
200
-
Featuring
LEACH
©
power and control solutions
www.esterline.com
AMERICAS
6900 Orangethorpe Ave.
P.O. Box 5032
Buena Park, CA 90622
.
.
Tel: (01) 714-736-7599
Fax: (01) 714-670-1145
EUROPE
2 Rue Goethe
57430 Sarralbe
France
.
.
Tel: (33) 3 87 97 31 01
Fax: (33) 3 87 97 96 86
ASIA
Units 602-603 6/F Lakeside 1
No.8 Science Park West Avenue
Phase Two, Hong Kong Science Park
Pak Shek Kok, Tai Po, N.T.
Hong Kong
Tel: (852) 2 191 3830
Fax: (852) 2 389 5803
Data sheets are for initial product selection and comparison. Contact Esterline Power Systems prior to choosing a component.
Date of issue: 01/07
- 180 -
Page 1 of 4
COIL CHARACTERISTICS (Vdc)
CODE
Nominal operating voltage
Maximum operating voltage
Maximum pickup voltage
- Cold coil at +125° C
- During high temp test at +125° C
- During continuous current test at +125° C
- Drop-out voltage (Maximum)
Coil resistance
Ω
±10% +25° C except type "C" & "V"
+20%, -10%
18
19.8
22.5
7
290
9
9.9
11.25
4.5
70
4.5
5
5.7
2.5
18
36
38
42
14
890
18
19.8
22.5
7
290
9
9.9
A
28
29
B
12
14.5
C
6
7.3
M
48
50
N [6]
28
29
12
14.5
SERIES KM
R [6]
V [6]
6
7.3
4.5
5
5.7
2.5
18
11.25
4.5
70
GENERAL CHARACTERISTICS
Temperature range
Minimum operating cycles (life) at rated load
Minimum operating cycles (life) at 25% rated load
Dielectric strength at sea level
- All circuits to ground and circuit to circuit
- Coil to ground
Dielectric strength at altitude 80,000 ft
Insulation resistance
- Initial (500 Vdc)
- After environmental tests (500 Vdc)
Sinusoidal vibration
Random vibration
- Applicable specification
- Method
- Test condition
- Duration
Shock
Maximum contact opening time under vibration and shock
Operate time at nominal voltage@25°C
Release time at nominal voltage@25°C
Contact make bounce at nominal voltage@25°C
Contact release break bounce at nominal voltage@25°C
Weight maximum
MIL-STD-202
214
1E (0.2G
2
/Hz, 50 to 2000 Hz)
15 minutes each plane
50G / 11 ms ± 1ms
10 µs
20 ms max
15 ms max
1 ms max
0.5 ms max [7]
0.188lb
100 M
Ω
min
50 M
Ω
min
0.12" DA / 10 to 57 Hz
20G / 57 to 2000 Hz
1250 Vrms
1000 Vrms
500 Vrms [4]
-70°C to +125°C
50,000 [3]
200,000
Unless otherwise noted, the specified temperature range applies to all relay characteristics.
Date of issue:
01/07
- 181 -
Page 2 of 4
NOTES
[1] Standard Intermediate current test applicable.
[2] For full rated load max. temp. and altitude use No. 8 wire or larger.
Relays to be mounted to limit mounting bracket temp. to 160 °C.
[3] DC inductive load 10,000 cycles. Motor load 20,000 cycles, lamp load 10,000 cycles.
[4] Applicable military specification: MIL-PRF-6106.
5. Special models available: i.e. high reliability testing, etc.
[6] "N R & V" coils have back EMF suppression to - 42 volts maximum.
[7] Applies to "N, R & V" coils only.
8. Relay will not operate, but will not be damaged by application of reverse polarity to coil.
SERIES KM
NUMBERING SYSTEM
KM -
A
5
A
Basic series designation__________________________|
|
|
|
1-Mounting Style (D,J,U)________________________________|
|
|
2-Terminal Types (5)________________________________________|
|
3-Coil Voltage see coil characteristics (A,B,C,M,N,R or V)_______|
MOUNTING STYLES
1.446
.150
3 PLACES
1.396
A1
-X2
.040
.230
A1
-X2
.512
.512
A2
+X1
1.025
A2
+X1
.254
.318
.450
.450
.318
1.446
1.396
.150
4 PLACES
1.220
MAX
.040
1.660
MAX
.157
1.220
MAX
1.051
MAX
1.660
MAX
.626
.937
1.025 MAX
1.718 MAX
LABEL
1.446
.150
3 PLACES
1.396
A1
-X2
.040
1.025 MAX
1.718 MAX
LABEL
MOUNTING STYLE D
MOUNTING STYLE J
.512
A2
+X1
.254
.450
.318
1.220
MAX
1.051
MAX
1.660
MAX
.040
1.025 MAX
1.718 MAX
LABEL
MOUNTING STYLE U
Date of issue:
01/07
- 182 -
Page 3 of 4
TERMINAL TYPES
SERIES KM
M
A1
-X2
TERMINAL TYPE 5
M
A2
+X1
.550
.106
.051
.433
.532
MOUNTING DATA & SCHEMATIC DIAGRAM
MOUNTING DATA & SCHEMATIC DIAGRAM
TERMINAL LAYOUT
A1
M
A1
-X2
SCHEMATIC DIAGRAM
-X2
A1
-X2
M
.512
A2
+X1
.253
A2
+X1
A2
+X1
.318
.450
"N" COIL (SUPPRESSED, SEE NOTE 5)
MOUNTING DIMENSIONS
1.406
.313
1.406
.313
1.406
.517
1.035
.626
.626
.626
J
U
.156 DIA
+.001 -.005
(ALL HOLES)
1.062
D
STANDARD TOLERANCE: .xx ±.03; .xxx±.010
Date of issue:
01/07
- 183 -
Page 4 of 4
Application notes
DERATING OF CONTACTS FOR DC VOLTAGES
ABOVE NOMINAL RATING
N°101
To establish a standard for the derating of relay contacts is, at best, a subjective practice. Limitations are governed by the
type of relay, contact gap, maximum voltage capabilities of the relay contact system, and the contact material.
The most common method is to derate the contacts by use of the Power Formula, using the known current and voltage.
This method is valid only for
Resistive Loads,
and is an approximation only; keeping in mind the limitations mentioned
above.
Power = IE (Current x Voltage)
I
2
E
2
= 2/3 I
1
E
1
Example:
A designer is working with a 55 volt DC system and has a relay rated at 10 amps resistive at 28 volts DC.
What is the maximum current that can be switched at 55 Vdc.
I
1
= 10 Amperes
E
1
= 28 VDC
E
2
= 55 VDC
I
2
= ? (Current ratings at 55 VDC Resistive)
I
2
E
2
= 2 I
1
E
1
/3
I
2
= 2 I
1
E
1
/E
2
3
= 2 (10 x 28)/55 x 3
= 560/165
I
2
= 3.4 Amperes at 55VDC
In addition, the user should always be concerned about the following:
1. Derating contacts that are rated for less than 10 Amperes at nominal voltage.
2. Derating contacts for use in system voltages above 130 Volts DC
Date of issue: 6/00
- 14 -
Page 1 of 1
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