SAFETY RELAY
SF-RELAYS
Double contact
FEATURES
53.3±0.3
2.098±.012
25.0
.984
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 Fo
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 ca
and a body-separater. That prevents s
circuit between contacts, which is cau
by their springs welding or damaged.
• High breakdown voltage 2,500 Vrm
between contacts and coil
• High sensitivity
Realizes thin shape and high sensitiv
(500 mW nominal operating power) b
utilizing high-efficiency polarized
magnetic circuit with 4-gap balanced
armature.
• Complies with safety standards
Standard products are UL, CSA, TÜV
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)
2 Form A
2 Form B
4 Form A
4 Form B
Characteristics
Contact arrangement
Max. operating speed
Initial insulation resistance*
1
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
10
7
10
5
2 Form A
4 Form
2 Form B
4 Form
180 cpm (at nominal volta
Min. 1,000 MΩ at 500 V D
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
Operate time*
3
(at nominal voltage)
Release time (without diode)*
3
(at nominal voltage)
Temperature rise (at nominal voltage)
(at 20°C)
Shock resistance
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
Approx. 7 ms
Approx. 6
Coil
Nominal operating power
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
500 mW
Max. 45°C
with nominal coil voltage a
at 6 A carry current
Min. 294 m/s
2
{30 G}
Min. 980 m/s
2
{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
4
Contact arrangement
2: 2 Form A 2 Form B
4: 4 Form A 4 Form B
Coil voltage
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
Part No.
SF2D-DC5V
SF2D-DC12V
SF2D-DC24V
SF2D-DC48V
SF2D-DC60V
SF4D-DC5V
SF4D-DC12V
SF4D-DC24V
SF4D-DC48V
SF4D-DC60V
Nominal
voltage, V DC
5
12
24
48
60
5
12
24
48
60
Pick-up
voltage, VDC
(max.)
3.75
9
18
36
45
3.75
9
18
36
45
Drop-out
voltage, V DC
(min.)
0.5
1.2
2.4
4.8
6.0
0.75
1.8
3.6
7.2
9.0
Coil resistance
Ω
(±10%)
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
500
500
500
500
500
500
500
500
500
500
Ma
vo
2 Form A
2 Form B
4 Form A
4 Form B
DIMENSIONS
1. 2 Form A 2 Form B
5
1
6
7
Schematic (Bottom
16±0.5
.630±.020
2
0.5
.020
5.08
.200
12.7
.500
12.7
.500
53.3±0.3
2.098±.012
5
6
7
8
9
10
11
12.7
.500
3.0±0.5
.118±.020
PC board pattern (Bot
2.54
.100
10-1.4 DI
10-.055 DI
25.0
.984
7.62
.300
2.54
.100
12.7
.500
1
2
9
10
11
12
General tolerance: ±0.3
±.012
Tolerance
2. 4 Form A 4 Form B
Schematic (Bottom
13
16±0.5
.630±.020
0.3
.012
5.08
.200
12.7
.500
12.7
.500
53.3±0.3
2.098±.012
13
5
1
14
6
15
7
16
8
14
15
1
5
9
2
17
18
19
6
10
7
11
12.7
.500
3.0±0.5
.118±.020
PC board pattern (Bot
33±0.5
1.299±.020
7.62
.300
2
9
17
10
18
11
19
12
20
7.62
.300
12.7
.500
7.62
.300
2.54
.100
2.54
.100
18-1.4
18-.055
General tolerance: ±0.3
±.012
Tolerance
Quantity: n = 20
Quantity: n = 6
Coil applied voltage: 100%V, 120%V
Contact carry current: 6A
30
25
Inside the coil
20
Quantity: n = 6
50
Operate/release time, ms
Rate of
change, %
100
40
Temperature rise,
°C
50
Drop-out voltage
-40 -20
0
20 40
Contact
-50
30
Operate time
20
Max.
x
Min.
Max.
x
Min.
Pick-up volt
15
10
5
0
60 80
Ambient
temperature
10
Release time
0
70
80
90
100
110
120 130
Coil applied voltage, %V
100
110
120
Coil applied voltage, %V
-100
6
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
the four form “a” contacts are maintained at greater than 0.5 mm
.020 inch.
Reliable isolation is thus ensured. The 2a2b typ
in the same way.
No.8
No.7
No.1
No.2
No.8
No.7
No.1
No.2
No.6
No.5
No.3
No.4
No.6
No.5
No.3
No.4
If the No. 2 contact welds.
Each of the four form “a” contacts
and 7) maintains a gap of greater
.020 inch.
Non-energized
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 betwee
contacts and the other contacts return by an non-energized.
No.8
No.7
No.1
No.2
No.8
No.7
No.1
No.2
No.6
No.5
No.3
No.4
No.6
No.5
No.3
No.4
Energized
Non-energized (when no. 1 contact is welded)
If the No. 1 contact welds.
The adjacent No. 2 contact mainta
greater than 0.5 mm
.020 inch.
Th
contacts, because the coil is not e
return to their normal return state
form “a” contacts (No. 3, 5, and 7)
contact gap of greater than 0.5 m
each of the form “b” contacts (No.
return to a closed state.
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.
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
No.2
State of other contacts
1
2
>0.5
>0.5
>0.5
≠
>0.5
≠
>0.5
≠
3
>0.5
>0.5
>0.5
>0.5
>0.5
4
≠
>0.5
≠
≠
>0.5
>0.5
>0.5
≠
>0.5
>0.5
>0.5
5
>0.5
>0.5
6
≠
>0.5
>0.5
>0.5
7
>0.5
>0.5
≠
>0.5
>0.5
8
≠
>0.5
>0.5
≠
>0.5
Contact No.
1
2
Welded
contact
No.
3
4
5
6
7
8
>0.5
≠
>0.5
>0.5
No.6
No.5
No.3
No.4
>0.5:
is kep
mm
.0
≠:
con
Empty
closed
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
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.
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.
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 HNO
3
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 pick-
up 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.)
indicated in the graph below.
Humidity, %R.H.
2/19/2003
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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 k
Temperature and humidity range for
usage, transport, and storage:
2) Condensation
Condensation forms when there is a
sudden change in temperature under h
temperature and high humidity conditi
Condensation will cause deterioration
the relay insulation.
3) Freezing
Condensation or other moisture may
freeze on the relay when the
temperatures is lower than 0°C
32°F.
T
causes problems such as sticking of
movable parts or operational time lag
4) Low temperature, low humidity
environments
The plastic becomes brittle if the rela
exposed to a low temperature, low
humidity environment for long periods
time.
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