SF2D-DC5V Просмотр технического описания (PDF) - Panasonic Corporation
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SF2D-DC5V
Panasonic Corporation
SF2D-DC5V Datasheet PDF : 6 Pages
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SF Double contact type
SAFETY STANDARDS
UL/C-UL (Recognized)
File No.
Contact rating
E120782*
6A 250V AC
6A 24V DC
* CSA standard: Certified by C-UL
TÜV (Certified)
File No.
Rating
968 EZ 116.03/10 (SF2D) 3A 24V DC
968 EZ 116.02/09 (SF4D) 6A 250V AC
File No.
12.0520
SEV
Contact rating
6A 24V DC
6A 250V AC
SAFETY STRUCTURE OF SF RELAYS
This SF relay design ensures that
subsequent operations shut down and
(unforeseen externally caused circuit or
device breakdowns, end of life incidents,
can automatically return to a safe state
when the SF relay suffers overloading
and noise, surge, and environmental
influences) owing to contact welding,
and other circuit abnormalities
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.
1. Forced operation method
(2 Form A 2 Form B,
4 Form A 4 Form B types)
2. Independent operation method
(4 Form A 4 Form B type)
3. Separate chamber method
(2 Form A 2 Form B,
4 Form A 4 Form B types)
4. 2 Form A 2 Form B contact
4 Form A 4 Form B contact
Structure
Operation
Min. 0.5 mm .020 inch
Contact a
Even when one contact is welded closed, the other
maintains a gap of greater than 0.5 mm .020 inch.
Card
In the diagram on the left, the lower contact “b” have
welded but the upper contact “a” maintain at a gap of
Contact b
greater than 0.5 mm .020 inch.
Subsequent contact movement is suspended and the
Weld
weld can be detected
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.
Return
External NO
contact weld
Enables design of safety circuits that allow weld
detection and return at an early stage.
Return
Return
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.
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.
Case separator
1
Card
2
Contact a
Body
separator
Contact b
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.
In independent chambers, the contacts “a” and “b” are kept apart by a body/
case separator or by the card itself.
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.
–4–
ASCTB120E 201408-T
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