SF4-DC5V Panasonic Electric Works, SF4-DC5V Datasheet - Page 5

• Manufacturer Part Number: SF4-DC5V
• Description: RELAY SAFETY PC MNT 8PST 6A 5VDC
• Manufacturer: Panasonic Electric Works
• Series: SFr

Specifications of SF4-DC5V

• Relay Type: Safety
• Contact Form: 8PST (4 Form A, 4 Form B)
• Contact Rating (current): 6A
• Switching Voltage: 250VAC
• Coil Type: Standard
• Coil Current: 100mA
• Coil Voltage: 5VDC
• Turn On Voltage (max): 3.75 VDC
• Turn Off Voltage (min): 0.75 VDC
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Circuit: 8PST (4 Form A, 4 Form B)
• Contact Rating @ Voltage: 6A @ 250VAC
• Control On Voltage (max): 3.75 VDC
• Control Off Voltage (min): 0.75 VDC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 255-1414

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.
If the internal contacts (No. 2, 3, 6, and 7) weld of 4a4b type, the armature becomes non-operational and the contact gaps of each of
the four form “a” contacts are maintained at greater than 0.5 mm
in the same way.
If the external contacts (No. 1, 4, 5, and 8) weld of 4a4b type, gaps of greater than 0.5 mm
contacts and the other contacts return by an non-energized.
The table below shows the state of the other contacts. In case of form “a” contact weld the coil applied voltage is 0 V.
In case of form “b” contact weld the coil applied voltage is nominal.
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
No.8
No.6
No.8
No.6
No.8
No.6
No.7
No.5
No.7
No.5
No.7
No.5
Terminal No. 20–19 12–11 8–7 16–15
Contact No.
Contact Operation Table
External Contacts Weld
Internal Contacts Weld
No.1 No.2 No.3 No.4
Non-energized
Energized
13–14 5–6 9–10 17–18
No.5 No.6 No.7 No.8
.020
No.1
No.2
No.3
No.4
No.1
No.2
No.3
No.4
No.1
No.2
No.3
No.4
inch.
Note: Contact gaps are shown at the initial state.
If the contact transfer is caused by load switching, it is necessary to check the actual loading.
Contact No.
Welded
contact
Non-energized
No.8
No.6
No.8
No.6
No.7
No.5
No.7
No.5
Non-energized (when no. 1 contact is welded)
No.
Energized (when no. 2 contact is welded)
Energized
Contact No.
1
2
3
4
5
6
7
8
.020
>0.5
>0.5
>0.5
1
inch. Reliable isolation is thus ensured. The 2a2b type operates
Weld
>0.5 >0.5
>0.5
>0.5 >0.5
>0.5
>0.5
2
>0.5
>0.5
>0.5
State of other contacts
3
No.1
No.3
No.1
No.3
No.2
No.4
No.2
No.4
>0.5
>0.5
>0.5
4
Contact gap
min 0.5 mm
.020 inch
>0.5
>0.5
>0.5
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
If the No. 1 contact welds.
The adjacent No. 2 contact maintains a gap of
greater than 0.5 mm
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
each of the form “b” contacts (No. 4, 6, and 8)
return to a closed state.
5
inch.
.020 inch
>0.5
>0.5
>0.5 >0.5
>0.5
>0.5 >0.5
6
are maintained between adjacent
>0.5
>0.5
>0.5
7
>0.5
>0.5
>0.5
.020
8
inch. The other
>0.5: contact gap
is kept at min. 0.5
mm
Empty cells: either
closed or open
: contact closed
.020 inch
.020
inch;
7