ENGINEERING DATA SHEET W260
RELAY - NONLATCH
2 PDT, 2 AMP
APPLICATION NOTES:
001
007
APPLICABLE SOCKETS:
HRCW
SO9005
SF250-R4
Non polarized, non latching hermetically sealed relay
Contact arrangement 2 PDT
Coil supply Direct current
Qualified to MIL-R-39016/6
PRINCIPLE TECHNICAL CHARACTERISTICS
Contacts rated at 2 Amp / 28Vdc
Weight 10 grams max
Dimensions of case
without mounting
brackets
20.6mm x 10.4mm x 10.4mm max
Hermetically sealed corrosion protected metal can.
CONTACT ELECTRICAL CHARACTERISTICS
Minimum
operating cycles Contact rating per
pole and load type Load Current in Amps
@28Vdc @115Vac/60-400Hz
100,000 cycles
100,000 cycles
100,000 cycles
1,000,000
cycles
resistive load
inductive load (0.2H) ---Type 1
---Type 2
lamp load
low level (10mA/50mV max)
2
0.75
0.5
0.16
-
0.3
-
-
-
-
100 cycles resistive overload 4 -
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: 9/10 - 37 - Page 1 of 4
COIL CHARACTERISTICS (Vdc) W260
CODE A B C D E F N
Nominal operating voltage 26.5 12 6 36 48 60 26.5
Maximum operating voltage 32 15 7.5 42 56 70 32
Maximum pickup voltage at +125° C 18 9 4.5 24 36 40 18
Guaranteed drop-out voltage at -65° C 1 0.5 0.25 2 2.5 3.5 1
Coil resistance in Ω ±10% at +25° C 700 160 40 1250 2500 3500 700
Back EMF suppression to (Vdc) N/A N/A N/A N/A N/A N/A -42
GENERAL CHARACTERISTICS
Temperature range -65°C to +125°C
Dielectric strength at sea level all points 500 Vrms / 50 Hz
Dielectric strength at altitude 25,000 m, all terminals to ground 350 Vrms / 50 Hz
Initial insulation resistance at 100 Vdc >10000 M Ω
Sinusoidal vibration (except N coil) 30 G / 10 to 3000 Hz
Sinusoidal vibration (only N coil) 20 G / 75 to 2000 Hz
Shock 100 G / 6 ms
Maximum contact opening time under vibration and shock 10 µs
Operate time at nominal voltage 4 ms max
Release time 4 ms max
Bounce time 2 ms max
Contact resistance at nominal current 50 mΩ max
Date of issue: 9/10 - 38 - Page 2 of 4
MOUNTING STYLES W260
Dimensions in mm
Tolerances unless otherwise specified ±0.25mm
TERMINAL TYPES
Date of issue: 9/10 - 39 - Page 3 of 4
SCHEMATIC DIAGRAM W260
NUMBERING SYSTEM
W260 * * * *** * *
Basic series designation__________________________| | | | | | |
1-Mounting Style (A,B,G,O,R)__________________________| | | | | |
2-Terminal Types(1,2,4)___________________________________| | | | |
3-Coil Voltage (A,B,C,D,E,F,N)________________________________| | | |
4-Standard Version (blank); 004 (qualified to MIL-R-39016/6)_______| | |
5-Failure Rate L,M,P,R (only for 004)__________________________________| |
6-Contact Data 1,2, (See page 1 for Type)_________________________________|
NOTES
1. Socket:
1.2 HRCW - 1M with mounting hardware and solder connections.
1.2 SF 250 R4 with mounting hardware and crimping contacts.
1.3 SO-9005 for printed circuit board.
2. Isolation spacer pads for PCB mounting available on request
3. Ultra sonic cleaning may adversely effect the normally closed contacts
TYPICAL CHARACTERISTICS
● Coil L/R ratio for all coil = 1.5 ms
● Coil resistance/temperature change: See application note no. 001
Date of issue: 9/10 - 40 - Page 4 of 4
+
X2 B2
B3 -
X1
B1
A2
+
X2
A1
A3
B3 -
B1
A2
B2 A1
X1 A3
N COIL
SHEMATIC DIAGRAM WITHOUT TERMINAL DESIGNATION WILL APPEAR ON THE CASE
BOTTOM VIEW, DE-ENERGIZED COIL
Application notes N°001
CORRECTION DUE TO COIL COPPER WIRE RESISTANCE
CHANGE IN TEMPERATURE
Example: Coil resistance at 25°C: 935 ohms. What is it at 125°C?
Correction coefficient on diagram is: 1.39 at 125°C. R becomes: 935x1.39=1299 Ohms
Correction also applies to operating voltages
Date of issue: 3/06 - 1 - Page 1 of 1
-80 -30 20 70 120 170
1.8
1.6
1.4
1.2
1
0.8
0.6
Correction coefficient
Temperature ( °C)
Nominal Resistance at 25°C Nominal Resistance at 20°C
Application notes N°007
SUPPRESSOR DEVICES FOR RELAY COILS
The inductive nature of relay coils allows them to create magnetic forces which are converted to mechanical movements to
operate contact systems. When voltage is applied to a coil, the resulting current generates a magnetic flux, creating
mechanical work. Upon deenergizing the coil, the collapasing magnetic field induces a reverse voltage (also known as back
EMF) which tends to maintain current flow in the coil. The induced voltage level mainly depends on the duration of the
deenergization. The faster the switch-off, the higher the induced voltage.
All coil suppression networks are based on a reduction of speed of current decay. This reduction may also slow down the
opening of contacts, adversly effecting contact life and reliability. Therefore, it is very important to have a clear understanding
of these phenomena when designing a coil suppression circuitry.
Typical coil characteristics
On the graph below, the upper record shows the contacts state. (High level NO contacts closed, low level NC contacts
closed, intermediate state contact transfer). The lower record shows the voltage across the coil when the current is switched
off by another relay contact.
The surge voltage is limited to -300V by the arc generated across contact poles. Discharge duration is about 200
mircoseconds after which the current change does not generate sufficient voltage. The voltage decreases to the point where
the contacts start to move, at this time, the voltage increases due to the energy contained in the NO contact springs. The
voltage decreases again during transfer, and increases once more when the magnetic circuit is closed on permanent
magnet.
Operating times are as follows:
Time to start the movement 1.5ms
Total motion time 2.3ms
Transfer time 1.4ms
Contact State
Date of issue: 6/00 - 8 - Page 1 of 4
Types of suppressors:
Passive devices.
The resistor capacitor circuit
It eliminates the power dissipation problem, as well as fast voltage rises. With a proper match between coil and resistor,
approximate capacitance value can be calculated from:
C = 0.02xT/R, where
T = operating time in milliseconds
R = coil resistance in kiloOhms
C = capacitance in microFarads
The series resistor must be between 0.5 and 1 times the coil resistance. Special consideration must be taken for the
capacitor inrush current in the case of a low resistance coil.
The record shown opposite is performed on the same relay as above. The operation time becomes:
- time to start the movement 2.3ms
- transfer time 1.2ms
The major difficulty comes from the capacitor volume. In our example of a relay with a 290 Ω coil and time delay of 8 ms, a
capacitance value of C=0.5 uF is found. This non polarized capacitor, with a voltage of 63V minimum, has a volume of about
1cm3. For 150V, this volume becomes 1.5 cm3.
Date of issue: 6/00 - 9 - Page 2 of 4
The bifilar coil
The principle is to wind on the magnetic circuit of the main coil a second coil shorted on itself. By a proper adaptation of the
internal resistance of this second coil it is possible to find an acceptable equilibrium between surge voltage and reduction of
the opening speed. To be efficient at fast voltage changes, the coupling of two coils must be perfect. This implies embedded
windings. The volume occupied by the second coil reduces the efficiency of the main coil and results in higher coil power
consumption. This method cannot be applied efficiently to products not specifically designed for this purpose.
The resistor (parallel with the coil)
For efficient action, the resistor must be of the same order of magnitude as the coil resistance. A resistor 1.5 times the coil
resistance will limit the surge to 1.5 times the supply voltage. Release time and opening speed are moderately affected. The
major problem is the extra power dissipated.
Semi-conductor devices
The diode
It is the most simple method to totally suppress the surge voltage. It has the major disadvantage of the higher reduction of
contact opening speed. This is due to the total recycling, through the diode, of the energy contained in the coil itself. The
following measurement is performed once again on the same relay. Operation times are given by the upper curve:
- time to start the movement 14ms
- transfer time 5ms
These times are multiplied by a coefficient from 4 to 8.
The lower curve shows the coil current. The increase prior to NO contact opening indicates that the contact spring dissipates
its energy. At the opening time the current becomes constant as a result of practically zero opening speed.
Due to this kind of behavior, this type of suppression must be avoided for power relays. For small relays which have to switch
low currents of less than 0.2 A, degradation of life is not that significant and the method may be acceptable.
Date of issue: 6/00 - 10 - Page 3 of 4
The diode + resistor network
It eliminates the inconvenience of the resistor alone, explained above, and it limits the action of a single diode. It is now
preferred to used the diode + zener network.
The diode + zener network
Like the resistor, the zener allows a faster decurrent decay. In addition it introduces a threshold level for current conduction
which avoids the recycling of energy released during contact movement.
The lower curve on the opposite record demonstrates those characteristics. Voltage limitation occurs at 42V. The two
voltages spikes generated by internal movement are at lower levels than zener conduction. As a result, no current is recycled
in the coil.
The opening time phases are as follows:
- time to start the movement 2.6ms
- total motion time 2.4ms
- transfer time 1.4ms
The release time is slightly increased. The contacts' opening speed remains unchanged.
Date of issue: 6/00 - 11 - Page 4 of 4
ENGINEERING DATA SHEET HRCW
RELAY SOCKET
2 AMP
BASIC SOCKET SERIES DESIGNATION FOR:
SERIES F250, F257, W260, GP5, and 144
MEETS THE REQUIREMENTS OF:
MIL-S-12883
DIMENSIONS
GENERAL CHARACTERISTICS
Supplied with mounting hardware.
Temperature range -65°C to +125°C
Weight 10 grams
Dielectric Strength at sea level 1500 Vrms / 50 Hz Minimum
Gold plated contact per MIL-G-45204
Dallyl phthalate, glass-fiber filled per MIL-M-14
Featuring LEACH© power and control solutions
www.leachintl.com
AMERICAS
6900 Orangethorpe Ave.
P.O. Box 5032
Buena Park, CA 90622 USA
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
Room 501, 5/F, The Centre Mark
287 - 299 Queen's Road Central
Hong Kong
Tel: (852) 2 191 3830
Fax: (852) 2 389 5803
Data sheets are for initial product selection and comparison. Contact Leach International prior to choosing a component.
Date of issue: 9/09 - 4 - Page 1 of 1
ENGINEERING DATA SHEET SO9005
RELAY SOCKET
2 AMP
BASIC SOCKET SERIES DESIGNATION FOR:
Series F250, F257, W260, WB260
MEETS THE REQUIREMENTS OF:
MIL-DTL-12883
GENERAL CHARACTERISTICS
Temperature range -65°C to +125°C
Weight 10 grams
Terminal designations On coupling face
Insulation resistance 1200 M Ω
Contact resistance 2 mΩ
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: 3/06 - 49 - Page 1 of 1
