SF4D-DC24V Panasonic Electric Works, SF4D-DC24V Datasheet - Page 5

• Manufacturer Part Number: SF4D-DC24V
• Description: RELAY SAFETY 6A 24VDC PCMNT 8PST
• Manufacturer: Panasonic Electric Works
• Series: SFr
• Type: Safety Relayr

Specifications of SF4D-DC24V

• Relay Type: Safety
• Contact Form: 8PST (4 Form A, 4 Form B)
• Contact Rating (current): 6A
• Switching Voltage: 250VAC
• Coil Type: Standard
• Coil Current: 20.8mA
• Coil Voltage: 24VDC
• Turn On Voltage (max): 14.4 VDC
• Turn Off Voltage (min): 3.6 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): 14.4 VDC
• Control Off Voltage (min): 3.6 VDC
• Brand/series: SF Series
• Current, Rating: 6 A
• Function: Safety
• Material, Contact: Gold-Flashed Silver Alloy
• Number Of Pins: 18
• Resistance, Coil: 1.152 Ohms
• Standards: cULus, TUV, CSA
• Temperature, Operating: -40 to +70 °C
• Termination: Solder
• Voltage, Breakdown: 2500 V (RMS) (Between Contacts and Coil)
• Voltage, Control: 24 VDC
• Voltage, Rating: 380 VAC
• Weight: 1.66 Oz. (Approx.)
• Relay Construction: Non-Latching
• Contact Arrangement: 4PST-NO/4PST-NC
• Coil Voltage Dc: 24V
• Voltage Rating (vdc): 30V
• Voltage Rating (vac): 440V
• Dropout Volt (min): 3.6VDCV
• Coil Resistance: 1.152kohm
• Pick-up Voltage (max): 18VDC
• Maximum Power Rating: 180W/1.5KVA
• Operate Time: 30ms
• Contact Current Rating: 6A
• Contact Material: Silver Tin Oxide/Gold Flash
• Coil Suppression Diode: No
• Push To Test Button: No
• Led Indicator: No
• Seal: Unsealed
• Product Height (mm): 16.5mm
• Product Depth (mm): 33mm
• Product Length (mm): 53.3mm
• Operating Temp Range: -40C to 70C
• Pin Count: 18
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 255-1441

SF Double contact type
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
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
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
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inch. Reliable isolation is thus ensured.
.020
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.
terminal
Welded
No.4
No.3
No.4
No.3
Non-energized (when No. 2 contact is welded)
No.
Energized (when No. 1 contact is welded)
inch. Reliable isolation is thus ensured.
1
2
3
4
>0.5
>0.5
1
State of other contacts
>0.5
>0.5
2
>0.5
>0.5
3
No.1
No.2
No.1
No.2
>0.5
>0.5
4
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
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
>0.5: contact gap is kept at
Empty cells: either closed or open
min. 0.5 mm
.020
.020 inch
inch.
.020
inch.