SF
(SF3 pending) (SF3 pending)
(SF3 pending)
POLARISED, MONOSTABLE
SAFETY RELAY with
(mechanical linked) forced
contacts operation
SF-RELAYS
π
enables to plan a circuit to detect welding
or go back to the beginning condition.
• Separated chamber structure
(2 Form A 2 Form B, 3 Form A 1 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.
25.0
.984
FEATURES
53.3±0.3
2.098±.012
• Forced operation contacts (2 Form A
2 Form B, 3 Form A 1 Form B)
16.5±0.3
.650±.012
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)
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
25.0
.984
53.3±0.3
2.098±.012
16.5±0.3
.650±.012
33±0.3
53.3±0.3
1.299±.012
2.098±.012
• UL/CSA,TÜV, SEV approved
(UL/CSA, SEV of SF3 pending)
16.5±0.3
.650±.012
mm inch
SPECIFICATIONS
Contact
Characteristics (at 25°C 77°F, 50% Relative humidity)
SF2 SF3
180 cpm (at nominal voltage)
Type
SF2
SF3
SF4
SF4
2 Form A 3 Form A 4 Form A
2 Form B 1 Form B 4 Form B
Max. operating speed
Arrangement
Initial insulation resistance*2
Min. 1,000 MΩ at 500 V DC
Initial contact resistance, max.
(By voltage drop 6 V DC 1 A)
Between con-
tact sets
30 mΩ
2,500 Vrms
Contact material
Gold-flashed silver alloy
6 A 250 V AC, 6 A 30 V DC
Initial break-
down voltage*3 contacts
Between con-
tact and coil
Between open
2,500 Vrms
2,500 Vrms
Nominal switching
capacity
Rating
(resistive)
Max. switching power
1,500 VA, 180 W
30 V DC, 440 V AC
6 A DC, AC
Operate time*4
Max. switching voltage
Approx. 17 ms
Approx. 7 ms
Approx. 18 ms
Approx. 6 ms
(at nominal voltage)
Release time (without diode)*4
(at nominal voltage)
Max. carrying current
Mechanical (at 180
cpm) (resistive)
Expected
life (min.
107
Electrical (at 20 cpm)
3×104*1
105
Temperature rise
Max. 45°C with nominal coil voltage
operations)
(at nominal voltage)
and at 6 A switching current
Functional*5
Destructive*5
Functional*7
Min. 294 m/s2 {30 G}
Min. 980 m/s2 {100 G}
117.6 m/s2 {12 G}, 10 to 55 Hz
at double amplitude of 2 mm
117.6 m/s2 {12 G}, 10 to 55 Hz
at double amplitude of 2 mm
Shock
resistance
Coil (at 25°C 77°F
Nominal operating power
)
500 mW
Remarks
Vibration
resistance
* Specifications will vary with foreign standards certification ratings.
*1
More than 105 operations when applying the nominal switching capacity to one
side of contact pairs of each Form A contact and Form B contact
*2 Measurement at same location as " Initial breakdown voltage " section
*3 Detection current: 10mA
Destructive
Conditions for oper-
ation, transport and
Ambient
temp.
–40°C to +70°C –40°F to +158°F
8
storage*
*4 Excluding contact bounce time
(Not freezing and
condensing at low
temperature)
*5 Half-wave pulse of sine wave: 11ms; detection time: 10µs
*6 Half-wave pulse of sine wave: 6ms
Humidity
5 to 85% R.H.
*7 Detection time: 10µs
Unit weight
37 g 1.31 oz
47 g 1.66 oz
*8 Refer to 5. Conditions for operation, transport and storage mentioned in
AMBIENT ENVIRONMENT (Page 61).
ORDERING INFORMATION
TYPICAL APPLICATIONS
• Signal
• Escalator
Ex. SF
2
DC 12 V
• Elevator
Contact arrangement
Coil voltage
• Medical Instruments
• Railway
• Factory Automation
2: 2 Form A 2 Form B
3: 3 Form A 1 Form B
4: 4 Form A 4 Form B
DC 5, 9, 12, 18, 21,
24, 36, 48, 60 V
UL/CSA, TÜV, SEV approved type is standard (SF2, SF4)
TÜV approved type is standard (SF3)
258
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