SF2-DC21V Просмотр технического описания (PDF) - Matsushita Electric Works
Номер в каталоге
Компоненты Описание
Список матч
SF2-DC21V
Matsushita Electric Works
SF2-DC21V Datasheet PDF : 7 Pages
| |||
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.1
No.3
No.2
Non-energized
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.
1
Welded
terminal
2
No.
3
4
State of other contacts
1
2
3
4
>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
Share Link: