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SF4D-DC60V

P1-P3P4-P6
SF Double contact type
–4–
ASCTB120E 201408-T
SAFETY STANDARDS
* CSA standard: Certified by C-UL
SAFETY STRUCTURE OF SF RELAYS
UL/C-UL (Recognized) TÜV (Certified) SEV
File No. Contact rating File No. Rating File No. Contact rating
E120782* 6A 250V AC
6A 24V DC
968 EZ 116.03/10 (SF2D)
968 EZ 116.02/09 (SF4D)
3A 24V DC
6A 250V AC
12.0520 6A 24V DC
6A 250V AC
Structure Operation
1. Forced operation method
(2 Form A 2 Form B,
4 Form A 4 Form B types)
The two contacts “a” and “b” are coupled with the same card. The operation
of each contact is regulated by the movement of the other contact.
Even when one contact is welded closed, the other
maintains a gap of greater than 0.5 mm .020 inch.
In the diagram on the left, the lower contact “b” have
welded but the upper contact “a” maintain at a gap of
greater than 0.5 mm .020 inch.
Subsequent contact movement is suspended and the
weld can be detected
2. Independent operation method
(4 Form A 4 Form B type)
None of four contacts are held in position by the armature. Even though one
of the external N.O. contacts has welded, the other three contacts have
returned owing to the de-energizing of the coil.
Enables design of safety circuits that allow weld
detection and return at an early stage.
As shown at the top right of the diagram on the left, if
the external N.O. contact welds, a 0.5 mm .020 inch
gap is maintained.
Each of the other contacts returns to N.O. because
the coil is no longer energized.
3. Separate chamber method
(2 Form A 2 Form B,
4 Form A 4 Form B types)
In independent chambers, the contacts “a” and “b” are kept apart by a body/
case separator or by the card itself.
Prevents shorting and fusing of springs and spring
failure owing to short-circuit current.
As shown on the diagram on the left, even if the
operating springs numbered 1 and 2 there is no
shorting between “a” and “b” contacts.
4. 2 Form A 2 Form B contact
4 Form A 4 Form B contact
Structure with independent COM contact of 2 Form A 2 Form B and
4 Form A 4 Form B contacts.
Independent COM enables differing pole circuit
configurations. This makes it possible to design
various kinds of control circuits and safety circuits.
This SF relay design ensures that
subsequent operations shut down and
can automatically return to a safe state
when the SF relay suffers overloading
and other circuit abnormalities
(unforeseen externally caused circuit or
device breakdowns, end of life incidents,
and noise, surge, and environmental
influences) owing to contact welding,
spring fusion or, in the worst-case
scenario, relay breakdown (coil rupture,
faulty operation, faulty return, and fatigue
and breakage of the operating spring and
return spring), and even in the event of
end of life.
Min. 0.5 mm .020 inch
Contact a
Card
Weld
Contact b
Return
Return
External NO
contact weld
Return
Case separator
Card
Contact a
Body
separator
Contact b
1
2
SF Double contact type
–5–
ASCTB120E 201408-T
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.
1) 2 Form A 2 Form B type
If the form “b” contact (No. 1 and 3) welds, the armature becomes non-operational, the contact gaps at the three form “a” contacts are
maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured.
When the form “a” contacts (No. 2 or 4) weld, the armature remains in a non-returned state and the contact gap at the two form “b”
contact is maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured.
Form “b” Contact Weld
Form “a” Contact Weld
Contact Operation Table
No.4
No.3
No.1
No.2
Non-energized
No.4
No.3
No.1
No.2
Energized (when No. 1 contact is welded)
Example: If the No. 1 contact welds
Each of the three form “a” contacts (No. 2 and 4)
maintain a gap of greater than 0.5 mm .020 inch.
No.4
No.3
No.1
No.2
Energized
No.4
No.3
No.1
No.2
Non-energized (when No. 2 contact is welded)
Example: If the No. 2 contact welds.
The two form “b” contact (No. 1 or 3) maintains a gap of
greater than 0.5 mm .020 inch.
No.4
No.3
No.1
No.2
Contact No. No.1 No.2 No.3 No.4
Terminal No. 11–12 7–8 5–6 9–10
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.
* 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.
State of other contacts
1234
Welded
terminal
No.
1 >0.5 >0.5
2 >0.5 >0.5
3 >0.5 >0.5
4 >0.5 >0.5
>0.5: contact gap is kept at
min. 0.5 mm .020 inch
Empty cells: either closed or open
SF Double contact type
–6–
ASCTB120E 201408-T
2) 4 Form A 4 Form B type
When internal contacts (No. 2, No. 3, No. 6 or No. 7) are welded, the armature becomes non-operational and the four form “a” contact
gaps are maintained at 0.5 mm .020inch or greater. Reliable cut-off is thus ensured.
When external contacts (No. 1, No. 4, No. 5 or No. 8) are welded, gaps of 0.5 mm .020inch and greater are maintained between
adjacent contacts and other contacts operate normally by the coil being non-energized.
NOTES
Internal Contacts Weld
External Contacts Weld
Contact Operation Table
No.1
No.2
No.3
No.4
No.8
No.7
No.6
No.5
Non-energized
No.1
No.2
No.3
No.4
No.8
No.7
No.6
No.5
Energized (when no. 2 contact is welded)
Example: 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.
No.1
No.2
No.3
No.4
No.8
No.7
No.6
No.5
Energized
Example 2:
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.
No.1
No.2
No.3
No.4
No.8
No.7
No.6
No.5
Non-energized (when no. 1 contact is welded)
Energized
Contact gap
min 0.5 mm
Weld
Non-energized
.020 inch
Example 1: 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.
No.1
No.2
No.3
No.4
No.8
No.7
No.6
No.5
Contact No. No.1 No.2 No.3 No.4
Terminal No.
20–19 12–11 8–7 16–15
No.5 No.6 No.7 No.8
13–14 5–6 9–10 17–18
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.
* 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.
Contact No.
State of other contacts
Contact No.
12345678
Welded
terminal
No.
1 >0.5 >0.5 ≠ >0.5 ≠ >0.5 ≠
2 >0.5 >0.5 >0.5 >0.5
3 >0.5 >0.5 >0.5 >0.5
4 ≠ >0.5 >0.5 ≠ >0.5 ≠ >0.5
5 >0.5 ≠ >0.5 ≠ >0.5 >0.5 ≠
6 >0.5 >0.5 >0.5 >0.5
7 >0.5 >0.5 >0.5 >0.5
8 >0.5 >0.5 ≠ >0.5 ≠ >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
1. For cautions for use, please read
“General Application Guidelines”.
P1-P3P4-P6

SF4D-DC60V

Mfr. #:
Buy SF4D-DC60V
Manufacturer:
Panasonic Industrial Devices
Description:
General Purpose Relays Polarized PowerRelay 4 Form A 4 Form B
Lifecycle:
New from this manufacturer.
Delivery:
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