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PDF SF2 Data sheet ( Hoja de datos )
| Número de pieza | SF2 | |
| Descripción | POLARISED / MONOSTABLE SAFETY RELAY with (mechanical linked) forced contacts operation | |
| Fabricantes | Matsushita | |
| Logotipo |  |
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SF
(SF3 pending) (SF3 pending)
(SF3 pending)
POLARISED, MONOSTABLE
SAFETY RELAY with
(mechanical linked) forced
contacts operation
SF-RELAYS
π
53.3±0.3
2.098±.012
25.0
.984
16.5±0.3
.650±.012
53.3±0.3
2.098±.012
25.0
.984
16.5±0.3
.650±.012
53.3±0.3
2.098±.012
33±0.3
1.299±.012
16.5±0.3
.650±.012
mm inch
FEATURES
• Forced operation contacts (2 Form A
2 Form B, 3 Form A 1 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)
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, 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.
• UL/CSA, TÜV, SEV approved
(UL/CSA, SEV of SF3 pending)
SPECIFICATIONS
Contact
Type
Arrangement
Initial contact resistance, max.
(By voltage drop 6 V DC 1 A)
Contact material
Rating
(resistive)
Nominal switching
capacity
Max. switching power
Max. switching voltage
Max. carrying current
Expected Mechanical (at 180
life (min. cpm) (resistive)
operations) Electrical (at 20 cpm)
SF2 SF3 SF4
2 Form A 3 Form A 4 Form A
2 Form B 1 Form B 4 Form B
30 mΩ
Gold-flashed silver alloy
6 A 250 V AC, 6 A 30 V DC
1,500 VA, 180 W
30 V DC, 440 V AC
6 A DC, AC
107
3×104*1
105
Coil (at 25°C 77°F)
Nominal operating power
500 mW
Remarks
* 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
*4 Excluding contact bounce time
*5 Half-wave pulse of sine wave: 11ms; detection time: 10µs
*6 Half-wave pulse of sine wave: 6ms
*7 Detection time: 10µs
*8 Refer to 5. Conditions for operation, transport and storage mentioned in
AMBIENT ENVIRONMENT (Page 61).
Characteristics (at 25°C 77°F, 50% Relative humidity)
SF2 SF3
SF4
Max. operating speed
180 cpm (at nominal voltage)
Initial insulation resistance*2
Min. 1,000 MΩ at 500 V DC
Between con-
tact sets
2,500 Vrms
Initial break- Between open
down voltage*3 contacts
2,500 Vrms
Between con-
tact and coil
2,500 Vrms
Operate time*4
(at nominal voltage)
Approx. 17 ms Approx. 18 ms
Release time (without diode)*4
(at nominal voltage)
Approx. 7 ms
Approx. 6 ms
Temperature rise
(at nominal voltage)
Max. 45°C with nominal coil voltage
and at 6 A switching current
Shock
resistance
Functional*5
Destructive*5
Min. 294 m/s2 {30 G}
Min. 980 m/s2 {100 G}
Vibration
resistance
Functional*7
Destructive
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
Conditions for oper-
ation, transport and
storage*8
(Not freezing and
condensing at low
temperature)
Ambient
temp.
Humidity
–40°C to +70°C –40°F to +158°F
5 to 85% R.H.
Unit weight
37 g 1.31 oz
47 g 1.66 oz
ORDERING INFORMATION
Ex. SF 2
DC 12 V
Contact arrangement
Coil voltage
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)
TYPICAL APPLICATIONS
• Signal
• Escalator
• Elevator
• Medical Instruments
• Railway
• Factory Automation
258
1 page  
SF
THE OPERATION OF SF RELAYS (when contacts are welded)
SF relays work to maintain a normal operating state even when overloading or short-circuit currents occur. It is also easy to include
weld detection circuits and safety circuits in the design to ensure safety even if contacts weld.
1) 2a2b Type
Form “b” Contact Weld
If the form “b” contacts (Nos. 1 and 3) weld, the armature becomes non-operational and the contact gap of the two form “a” contacts
is maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured.
No.4
No.3
Non-energized
No.1
No.2
No.4 No.1 If the No. 1 contact welds.
A gap of greater than 0.5 mm .020 inch is main-
tained at each of the two form "a" contacts (Nos.
2 and 4).
No.3
No.2
Energized (when no. 1 contact is welded)
Form “a” Contact Weld
If the two form “a” contacts (Nos. 2 and 4) weld, the armature becomes non-operational and the gap between the two form "b"
contacts is maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured.
No.4
No.1
No.4
No.1 If the No. 2 contact welds.
Each of the two form "b" contacts (Nos. 1 and 3)
maintains a gap of greater than 0.5 mm .020 inch.
No.3
No.2
No.3
No.2
Energized
Non-energized (when no. 2 contact is welded)
Contact Operation Table
The table below shows the state of the other contacts when the current through the welded form “a” contact is 0 V and the rated
voltage is applied through the form “b” contact.
No.4
No.1
No.3
No.2
Contact No. No.1 No.2 No.3 No.4
Terminal No. 11–12 7–8 5–6 9–10
Contact No.
Contact No.
Welded
terminal
No.
1
2
3
4
State of other contacts
1234
>0.5
>0.5
>0.5 >0.5
>0.5
>0.5
>0.5 >0.5
>0.5: contact gap is kept at min. 0.5 mm .020 inch
Empty cells: either closed or open
Note: Contact gaps are shown at the initial state.
If the contacts change state owing to loading/breaking
it is necessary to check the actual loading.
262
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SF2.PDF ] | |
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