SF3 NAIS [Nais(Matsushita Electric Works)], SF3 Datasheet - Page 6

• Manufacturer Part Number: SF3
• Description: POLARISED, MONOSTABLE SAFETY RELAY with (mechanical linked) forced contacts operation
• Manufacturer: NAIS [Nais(Matsushita Electric Works)]

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 volt-
age is applied through the form “b” contact.
2) 3a1b Type
If the form “b” contact (No. 3) welds, the armature becomes non-operational, the contact gaps at the three form “a” contacts are
maintained at greater than 0.5 mm
When the form “a” contacts (nos. 1, 2, and 4) weld, the armature remains in a non-returned state and the contact gap at the single
form “b” contact is maintained at greater than 0.5 mm
No.4
No.3
No.4
No.3
No.4
No.3
Terminal No.
Contact No.
Contact Operation Table
Form “b” Contact Weld
Form “a” Contact Weld
Non-energized
11–12
No.1
Energized
No.2
7–8
No.3
5–6
9–10
No.4
No.1
No.2
No.1
No.2
No.1
No.2
.020
inch. Reliable isolation is thus ensured
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.
Contact No.
No.4
No.3
No.4
No.3
Non-energized (when no. 2 contact is welded)
terminal
Welded
Energized (when no. 3 contact is welded)
No.
.020
Contact No.
inch. Reliable isolation is thus ensured.
1
2
3
4
>0.5
State of other contacts
1
>0.5
2
>0.5
>0.5
>0.5
3
No.1
No.2
No.1
No.2
>0.5
4
If the No. 3 contact welds.
Each of the two form “a” contacts (Nos. 1, 2, and
4) maintain a gap of greater than 0.5 mm
inch.
If the No. 2 contact welds.
The single form “b” contact (No. 3) maintains a
gap of greater than 0.5 mm
Empty cells: either closed or open
>0.5: contact gap is kept at min. 0.5 mm
.020
inch.
.020
.020 inch
SF
263