(pending)
POLARISED, MONOSTABLE
SAFETY RELAY
SF-RELAYS
Double contact
FEATURES
25.0
.984
53.3±0.3
2.098±.012
16.5±0.5
.650±.020
2 Form A 2 Form B
53.3±0.3
2.098±.012
33±0.5
1.299±.020
16.5±0.5
.650±.020
4 Form A 4 Form B
mm inch
• High contact reliability
High contact reliability is achieved through
the use of a double contact.
• Forced operation contacts
(2 Form A 2 Form B)
N.O. and N.C. side contacts are
connected through a card so that one
interacts with the other in movement. In
case of a contact welding, the other keeps
a min. 0.5mm .020inch contact gap.
• Independent operation contacts
(4 Form A 4 Form B)
There are 4 points of forced operation
contacts.
Each pair of contacts is free from the main
armature and is independent from each
other. So if a N.O. pair of contacts are
welded, the other 3 N.O. contacts are not
effected (operate properly) That enables
to plan a circuit to detect welding or go
back to the beginning condition.
• Separated chamber structure (2 Form
A 2 Form B, 4 Form A 4 Form B)
N.O. and N.C. side contacts are put in
each own space surrounded with a card
and a body-separater. That prevents short
circuit between contacts, which is caused
by their springs welding or damaged.
• High breakdown voltage 2,500 Vrms
between contacts and coil
• High sensitivity
Realizes thin shape and high sensitivity
(500 mW nominal operating power) by
utilizing high-efficiency polarized
magnetic circuit with 4-gap balanced
armature.
• Complies with safety standards
Standard products are UL, CSA, TÜV and
SEV certified. Comform to European
standards. TÜV certified (945/EL, 178/
88). Complies with SUVA European
standard.
SPECIFICATIONS
Contact
Contact arrangement
Initial contact resistance, max.
(By voltage drop 6 V DC 1 A)
Contact material
Nominal switching
capacity
Rating
Max. switching power
(resistive)
Max. switching voltage
Max. carrying current
Expected
Mechanical (at 180 cpm)
life (min.
operations) Electrical (at 20 cpm)
Characteristics
2 Form A
2 Form B
4 Form A
4 Form B
30 mΩ
Gold-flashed silver alloy
6 A 250 V AC, 6 A 30 V DC
1,500 VA, 180 W
440 V AC, 30 V DC
6A
107
105
Coil
Nominal operating power
Contact arrangement
Max. operating speed
Initial insulation resistance*1
Min. 1,000 MΩ at 500 V DC
Between
open
contacts
1,300 Vrms
Initial
breakdown Between contact sets
2,500 Vrms
voltage*2
Between contact and coil
2,500 Vrms
Approx. 17 ms Approx. 18 ms
Operate time*3 (at nominal voltage)
Release time (without diode)*3
(at nominal voltage)
Temperature rise (at nominal voltage)
(at 20°C)
Shock resistance
500 mW
Remarks
* Specifications will vary with foreign standards certification ratings.
*1 Measurement at same location as “Initial breakdown voltage” section
*2 Detection current: 10mA
*3 Excluding contact bounce time
*4 Half-wave pulse of sine wave: 11ms; detection time: 10µs
*5 Half-wave pulse of sine wave: 6ms
*6 Detection time: 10µs
*7 Refer to 6. Usage, transport and storage mentioned in NOTES
Functional*4
Destructive*5
Functional*6
Vibration resistance
Destructive
Conditions for operation,
Ambient
transport and storage*7 (Not temp.
freezing and condensing at
Humidity
low temperature)
Unit weight
4
2 Form A
4 Form A
2 Form B
4 Form B
180 cpm (at nominal voltage)
Approx. 7 ms
Approx. 6 ms
Max. 45°C
with nominal coil voltage and
at 6 A carry current
Min. 294 m/s2 {30 G}
Min. 980 m/s2 {100 G}
10 to 55 Hz at double
amplitude of 2 mm
10 to 55 Hz at double
amplitude of 2 mm
–40°C to +70°C
–40°F to +158°F
5 to 85% R.H.
Approx.
38 g 1.34 oz
Approx.
47 g 1.66 oz
ORDERING INFORMATION
Ex. SF
2
D
TYPICAL APPLICATIONS
• Industrial equipment such as presses and machine tools
DC 5 V
Contact arrangement
Coil voltage
2: 2 Form A 2 Form B
4: 4 Form A 4 Form B
DC 5, 12, 24, 48, 60 V
UL/CSA, TÜV, SEV approved type is standard
TYPES AND COIL DATA (at 20°C 68°F)
Contact
arrangement
2 Form A
2 Form B
4 Form A
4 Form B
Part No.
Nominal
voltage, V DC
Pick-up
voltage, VDC
(max.)
Drop-out
voltage, V DC
(min.)
Coil resistance
Ω (±10%)
SF2D-DC5V
SF2D-DC12V
SF2D-DC24V
SF2D-DC48V
SF2D-DC60V
SF4D-DC5V
SF4D-DC12V
SF4D-DC24V
SF4D-DC48V
SF4D-DC60V
5
12
24
48
60
5
12
24
48
60
3.75
9
18
36
45
3.75
9
18
36
45
0.5
1.2
2.4
4.8
6.0
0.75
1.8
3.6
7.2
9.0
50
288
1.152
4.608
7.200
50
288
1.152
4.608
7.200
Nominal
operating
current,
mA (±10%)
100
41.7
20.8
10.4
8.3
100
41.7
20.8
10.4
8.3
Nominal
operating
power, mW
Max. allowable
voltage, V DC
500
500
500
500
500
500
500
500
500
500
6
14.4
28.8
57.6
72
6
14.4
28.8
57.6
72
DIMENSIONS
mm inch
Schematic (Bottom view)
1. 2 Form A 2 Form B
5
6
7
8
9
10
11
12
1
16±0.5
.630±.020
2
0.5
.020
5.08
.200
12.7
.500
12.7
.500
12.7
.500
3.0±0.5
.118±.020
PC board pattern (Bottom view)
53.3±0.3
2.098±.012
5
25.0
.984
6
7
2.54
.100
8
10-1.4 DIA. HOLES
10-.055 DIA. HOLES
2.54
.100
1
12.7
.500
7.62
.300
2
9
10
11
12
General tolerance: ±0.3 ±.012
Tolerance: ±0.1 ±.004
2. 4 Form A 4 Form B
Schematic (Bottom view)
16±0.5
.630±.020
12.7
.500
12.7
.500
12.7
.500
14
15
16
5
9
6
10
7
11
8
12
17
18
19
20
1
0.3
.012
5.08
.200
13
2
3.0±0.5
.118±.020
53.3±0.3
2.098±.012
PC board pattern (Bottom view)
33±0.5
1.299±.020
13
5
14
6
15
7
16
8
7.62
.300
1
12.7
.500
7.62
.300
2.54
.100
18-1.4 DIA. HOLES
18-.055 DIA. HOLES
2.54
.100
2
9
17
10
18
11
19
12
20
7.62
.300
General tolerance: ±0.3 ±.012
Tolerance: ±0.1 ±.004
5
REFERENCE DATA
2. Temperature rise
3. Ambient temperature characteristics
Tested sample: SF2D-DC24V
Quantity: n = 20
Tested sample: SF4D-DC24V
Quantity: n = 6
Coil applied voltage: 100%V, 120%V
Contact carry current: 6A
Tested sample: SF4D-DC12V
Quantity: n = 6
30
40
30
Operate time
20
Release time
10
6
Temperature rise, °C
Operate/release time, ms
50
0
Rate of
change, %
1. Operate/release time (without diode)
70
80
Max.
x
Min.
Max.
x
Min.
90
100
110
120 130
Coil applied voltage, %V
25
Inside the coil
100
50
Drop-out voltage
20
-40 -20
15
Pick-up voltage
0
20 40
10
Contact
-50
5
0
100
110
120
Coil applied voltage, %V
-100
60 80
Ambient
temperature, °C
THE OPERATION OF SF RELAYS (when contacts are welded)
SF relays work to maintain a normal operating state even when the contact welding occur by overloading or short-circuit
currents. It is easy to make weld detection circuits and safety circuits in the design to ensure safety even if contacts weld.
Internal Contacts Weld
If the internal contacts (No. 2, 3, 6, and 7) weld of 4a4b type, the armature becomes non-operational and the contact gaps of each of
the four form “a” contacts are maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured. The 2a2b type operates
in the same way.
No.8
No.1
No.8
No.1
No.7
No.2
No.7
No.2
No.6
No.3
No.6
No.3
No.5
No.4
No.5
No.4
Non-energized
If the No. 2 contact welds.
Each of the four form “a” contacts (No. 1, 3, 5,
and 7) maintains a gap of greater than 0.5 mm
.020 inch.
Energized (when no. 2 contact is welded)
External Contacts Weld
If the external contacts (No. 1, 4, 5, and 8) weld of 4a4b type, gaps of greater than 0.5 mm .020 inch are maintained between adjacent
contacts and the other contacts return by an non-energized.
No.8
No.1
No.8
No.1
No.7
No.2
No.7
No.2
No.6
No.3
No.6
No.3
No.5
No.4
No.5
No.4
Energized
Non-energized (when no. 1 contact is welded)
If external connections are made in series.
Even if one of the contacts welds, the other contacts
operate independently and the contact gaps are
maintained at greater than 0.5 mm .020 inch.
If the No. 1 contact welds.
The adjacent No. 2 contact maintains a gap of
greater than 0.5 mm .020 inch. The other
contacts, because the coil is not energized,
return to their normal return state; each of
form “a” contacts (No. 3, 5, and 7) maintains a
contact gap of greater than 0.5 mm .020 inch;
each of the form “b” contacts (No. 4, 6, and 8)
return to a closed state.
Weld
Energized
Contact gap
min 0.5 mm .020 inch
Non-energized
Contact Operation Table
The table below shows the state of the other contacts. In case of form “a” contact weld the coil applied voltage is 0 V.
In case of form “b” contact weld the coil applied voltage is nominal.
Contact No.
No.8
No.7
No.1
Contact No.
No.2
No.6
No.3
No.5
No.4
Contact No. No.1 No.2 No.3 No.4 No.5 No.6 No.7 No.8
Terminal No. 20–19 12–11 8–7 16–15 13–14 5–6 9–10 17–18
Welded
contact
No.
1
1
2
>0.5
3
4
5
6
≠
>0.5
>0.5
7
8
≠
2
>0.5
>0.5
>0.5
≠
>0.5
>0.5
State of other contacts
3
4
5
6
>0.5
≠
>0.5
≠
>0.5
>0.5
>0.5
>0.5
>0.5
>0.5
≠
≠
≠
>0.5
>0.5
>0.5
>0.5
>0.5
>0.5
≠
>0.5
>0.5
7
>0.5
>0.5
≠
>0.5
>0.5
8
≠
>0.5
>0.5
≠
>0.5: contact gap
is kept at min. 0.5
mm .020 inch
≠: contact closed
Empty cells: either
closed or open
>0.5
>0.5
Note: Contact gaps are shown at the initial state.
If the contact transfer is caused by load switching, it is necessary to check the actual loading.
7
NOTES
2/19/2003
(2) High-frequency load-operating
When high-frequency opening and
closing of the relay is performed with a
load that causes arcs at the contacts,
nitrogen and oxygen in the air is fused by
the arc energy and HNO3 is formed. This
can corrode metal materials.
Three countermeasures for these are
listed here.
1. Incorporate an arc-extinguishing
circuit.
2. Lower the operating frequency
3. Lower the ambient humidity
3) For secure operations, the voltage
applied to the coil should be nominal
voltage. In addition, please note that pickup and drop-out voltage will vary
according to the ambient temperature and
operation conditions.
4) Heat, smoke, and even a fire may occur
if the relay is used in conditions outside of
the allowable ranges for the coil ratings,
contact ratings, operating cycle lifetime,
and other specifications. Therefore, do
not use the relay if these ratings are
exceeded. Also, make sure that the relay
is wired correctly.
5) Incorrect wiring may cause unexpected
events or the generation of heat or flames.
6) Check the ambient conditions when
storing or transporting the relays and
devices containing the relays. Freezing or
condensation may occur in the relay,
causing functional damage. Avoid
subjecting the relays to heavy loads, or
strong vibration and shocks.
6. Usage, transport and storage
conditions
1) Ambient temperature, humidity, and
atmospheric pressure during usage,
transport, and storage of the relay:
(1) Temperature:
–40 to +70°C –40 to +158°F
(2) Humidity: 5 to 85% RH
(Avoid freezing and condensation.)
The humidity range varies with the
temperature. Use within the range
indicated in the graph below.
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1. Coil operating power
Pure DC current should be applied to the
coil. The wave form should be rectangular.
If it includes ripple, the ripple factor should
be less than 5%. However, check it with
the actual circuit since the characteristics
may be slightly different.
2. Coil connection
When connecting coils, refer to the wiring
diagram to prevent mis-operation or
malfunction.
3. Cleaning
For automatic cleaning, the boiling
method is recommended. Avoid ultrasonic
cleaning which subjects the relays to high
frequency vibrations, which may cause
the contacts to stick.
It is recommended that a fluorinated
hydrocarbon or other alcoholic solvents
be used.
4. Soldering
We recommend the following soldering
conditions
1) Automatic soldering
1) Preheating: 100°C 212°F, max. 60 s
2) Soldering: 250°C 482°F, max. 5 s
5. Others
1) If the relay has been dropped, the
appearance and characteristics should
always be checked before use.
2) The cycle lifetime is defined under the
standard test condition specified in the
JIS* C 5442-1986 standard (temperature
15 to 35°C 59 to 95°F, humidity 25 to
85%). Check this with the real device as it
is affected by coil driving circuit, load type,
activation frequency, activation
phase,ambient conditions and other
factors.
Also, be especially careful of loads such
as those listed below.
(1) When used for AC load-operating and
the operating phase is synchronous.
Rocking and fusing can easily occur due
to contact shifting.
Humidity, %R.H.
85
Tolerance range
(Avoid freezing when (Avoid
used at temperatures condensation when
lower than 0°C 32°F) used at temperatures
higher than 0°C 32°F)
5
–40
–40
0
+32
Temperature, °C °F
+70
+158
(3) Atmospheric pressure: 86 to 106 kPa
Temperature and humidity range for
usage, transport, and storage:
2) Condensation
Condensation forms when there is a
sudden change in temperature under high
temperature and high humidity conditions.
Condensation will cause deterioration of
the relay insulation.
3) Freezing
Condensation or other moisture may
freeze on the relay when the
temperatures is lower than 0°C 32°F. This
causes problems such as sticking of
movable parts or operational time lags.
4) Low temperature, low humidity
environments
The plastic becomes brittle if the relay is
exposed to a low temperature, low
humidity environment for long periods of
time.
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