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SFN4D-DC16V
Safety Relay, 16 VDC, 4PST-NO, DPST-NC, SFN4D Series, Through Hole, 8 A, PC Pin
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: PANASONIC
- Product type: Safety Relays
- SVHC: To Be Advised
- IP Rating: -
- Coil Voltage: 16VDC
- Product Range: SFN4D Series
- Relay Mounting: Through Hole
- Contact Current: 8A
- Relay Terminals: PC Pin
- Contact Material: Silver Tin Oxide
- Contact Configuration: 4PST-NO, DPST-NC
- Contact Voltage AC Nom: 230V
- Contact Voltage DC Nom: -
| Delivery and price | |
|---|---|
| Units per pack | 20 |
| Price | 16.43 € |
| Current stock | 25+ |
| Lead time | 30 days |
Datasheet
SFN4D
**Low profile safety relay with forcibly guided double contacts**
## SFN4D RELAY
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14.5<br>\<br>Tolerance ±0.3 mm<br> Weight approx. 42 g<br>**----- End of picture text -----**<br>
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53.3<br>33.0<br>_———_ ~ S<br>**----- End of picture text -----**<br>
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Length: 3.0<br>**----- End of picture text -----**<br>
## **FEATURES**
- **Relay complies with EN 50205, Type B**
- **Polarized magnet system with snap action function**
- **Extremely small total power loss**
- **Nominal coil power consumption of 390mW**
- **Double contacts with low contact resistance, e.g. [(6A)[2]** **2.5m** **]** **4NO = 360mW**
- **Relay height, 14.5mm**
- **Reinforced insulation according to EN 50178**
- **between coil-contacts and contacts-contacts**
- **rated voltage of the circuits 230 / 400V or 277 / 480Vrms**
- **rated impulse voltage of 6kV** **clearance** **5.5 mm - pollution degree 2** **creepage distance** **5.5mm**
## **SPECIFICATIONS**
## **Contact**
|**SPECIFICATIONS**<br>**Contact**||
|---|---|
|Contact configuration (a = normally open / NO,<br>b = normally closed / NC)|4a2b|
|Contact material|AgSnO2, with Au flash|
|Contact resistance (initial at 6V DC, 1A)<br>Typical contact resistance|30m<br>2.5m|
|Max. switching capacity|6A/8A*1250V AC|
|Max. switching voltage|500V AC / DC|
|Min. switching voltage / min. switching current|Reference 10V / 10mA|
|Pick-up / drop-out / bounce time<br>(approx. values at Unominal)|23 / 6*2/ 2ms|
|Mechanical life|107ops|
## **Coil**
|Operate / release<br>and holding at 20°C (% of Unominal)*3|75% / 25%<br>min. 48%|
|---|---|
|Pick-up/nominal power consumption|219-236 / 390-420mW|
## **Characteristics**
|**Characteristics**||
|---|---|
|Max. switching frequency (without load)|5Hz|
|Permissible ambient temperature at nominal<br>power consumption*3|-25°C to 92°C|
|Upper temperature limit|105°C|
|Test voltage:<br>open contact / contact-contact / contact-coil|2500 / 4000 /<br>5000Vrms|
|Insulation resistance at 500V DC (initial)|109|
|Shock resistance (11ms) NO/NC*4|20 / 15G|
|Vibration resistance 10 – 200 Hz (10 – 55 Hz,<br>amplitude 2 mm)*4|10G|
|Degree of protection|RT III*5|
|Unit weight|42g|
## **Important: Relay characteristics may be influenced by:**
- strong external magnetic fields
- magnetic conductive materials near the relay
- narrow top-to-top mounting (printed surface to printed surface)
- *1 See “ELECTRICAL LIFE (Reference Data)[*] ” on page 2.
- *2 Without diode
- *3 See also “REFERENCE DATA” on page 3.
*4 Contact interruption <10s
- *5 According to EN 61810-1: 2004, table 2
## **ORDERING INFORMATION**
Ex. SFN4D DC12 V
Coil voltage (DC) 5, 9, 12, 16, 18, 21 24, 36, 48, 60
Notes: 1) Standard packing; Tube: 10 pcs. Case 100 pcs. 2) Other coil voltage available upon request
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## **COIL DATA (at 20°C)**
|Part number<br>|Coil nominal voltage V DC|Operate voltage*1V DC|Release voltage*1V DC|Coil resistance<br>(10%, 20°C)|
|---|---|---|---|---|
|SFN4D-DC5V|5|3.75|1.25|64.1|
|SFN4D-DC9V|9|6.75|2.25|207.7|
|SFN4D-DC12V|12|9.00|3.00|369.2|
|SFN4D-DC16V|16|12.00|4.00|656.4|
|SFN4D-DC18V|18|13.5|4.50|830.8|
|SFN4D-DC21V|21|15.75|5.25|1130.8|
|SFN4D-DC24V|24|18.00|6.00|1476.9|
|SFN4D-DC36V|36|27.00|9.00|3085.7|
|SFN4D-DC48V|48|36.00|12.00|5485.7|
|SFN4D-DC60V|60|45.00|15.00|8571.4|
*1 Operate and release voltage at different temperatures, see “REFERENCE DATA” on page 3, coil voltage characteristics.
## **SWITCHING CAPABILITY**
- Making / breaking capacities according to EN 60947-5-1: 2000, table 4 / 5; AC15: 6A 230V AC / DC13: 6A 24V DC
- Endurance / overload test according to UL 508 16 edition, sections 42 / 43; 6A 250V AC / 6A 24V DC; B300 / R300; File E120782
## **ELECTRICAL LIFE (Reference Data)[*]**
|Voltage|Current (A)|Load type|Frequency|Duty cycle|No. of contacts|No. of ops.|
|---|---|---|---|---|---|---|
|230V AC|8|AC 1|0.25Hz|25%|4|85,000|
|230V AC|6|AC 1|0.25Hz|25%|4|200,000|
|230V AC|2.5|AC 1|0.25Hz|25%|4|1,500,000|
|230V AC|60 / 6|AC 15|0.20Hz|20%|3|40,000|
|24V DC|6|DC 1|0.25Hz|25%|4|2,000,000|
|250V DC|0.27|DC 13|0.10Hz|10%|4|1,000,000|
*Test conditions: Room temperature, breathing hole closed, dielectric strength according to EN61810-1:2004.
## **DIMENSIONS**
Download **CAD DataCAD Data** from our Web site.
## **Outer dimensions**
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CAD Data<br>53.3<br>1<br>5.4 15 12.5 15 5.4<br>General tolerance: 0.3<br>Projection mode:<br>**----- End of picture text -----**<br>
## **Schematic (Bottom view)**
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9 10 15 16<br>7 8 13 14<br>5 6 11 12<br>+1 2-<br>**----- End of picture text -----**<br>
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33<br>Breathing hole<br>0.3 (2x) 0.48 (12x)<br>3.34 (2.16)<br>12.5 7.5 7.5<br>14.5 0.3 Stand-off<br>3<br>**----- End of picture text -----**<br>
## **PC board pattern (Bottom view)**
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53.3<br>5.4 15 12.5 15<br>1.4 dia., typical value for manual insertion<br>1.6 dia., typical value for automatic insertion<br>7.5<br>33 7.5<br>12.5<br>3.34<br>**----- End of picture text -----**<br>
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## **REFERENCE DATA**
## **Coil voltage characteristics**
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170<br>160 permissible coil voltage<br>without contact load<br>150<br>140<br>130<br>120<br>110 operative range of the coil voltage<br>100<br>90 typical operate and voltage with the +/release -3σ range<br>without preheated coil<br>80<br>70<br>60<br>min. recommended<br>50 holding voltage<br>40<br>30<br>20<br>10<br>min. release voltage at the end of the electrical life<br>-30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110<br>Ambient temperature [ [o] C]<br>Coil applied voltage [%]<br>**----- End of picture text -----**<br>
## **Thermic operating range**
## **Switching time in relation to coil excitement at 20°C**
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170 170<br>160 4 NO contacts<br>simultaneously 160<br>150<br>To the right of the curves<br>140 the relay operates in a<br>temperature range exceeding 150<br>130 the stated limit of 105 [o] C<br>140<br>120<br>110<br>130<br>100<br>bbm<br>90 120<br>80<br>110<br>70<br>60 100<br>50<br>90<br>40<br>30 80<br>NC 1 NO 4<br>20<br>70<br>10<br>0 60<br>40 50 60 70 80 90 100 110 0 10 20 30 40 50 60<br>Ambient temperature [ [o] C] Typ. pick-up time [ms]<br>4 x 8A 4 x 6A 4 x 0A<br>Coil applied voltage [%]<br>Coil applied voltage [%]<br>**----- End of picture text -----**<br>
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## **REFERENCE DATA, continued**
## **Load limit curve**
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500<br>300<br>300 W<br> 200<br>250 W<br>200 W<br>150 W<br>100<br>70 100 W<br>80 W<br>50<br>60 W<br>30 40 W<br>20 20 W<br>10 W<br>10<br>0.1 0.2 0.3 0.5 0.7 1 2 3 4 5 6 7 8 10<br>Contact current [A]<br>Contact voltage [VDC]<br>**----- End of picture text -----**<br>
## **Time / current characteristic**
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10000<br>1000<br>Fuse-link D II 6A , 500 V<br> operating class gL<br>(6A gG) DIN 49 515<br>100<br> SFN4D, Contact withstand current<br>10<br>Fuse-link 6,3A F (quick acting)<br>glass tube 5 x 20 mm, 250V<br> IEC 60 127-2/2<br>1<br>0.001 0.01 0.1 1 10 100 1000 10000 100000<br>Time [Sec]<br>Current [A]<br>**----- End of picture text -----**<br>
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## **APPLICATION NOTES**
## **The SFN4D Safety Relay**
|NC contact 5-6<br>Sub card 1<br>NO contact 7-8<br>NO contact 9-10<br>Sub card 2<br>=<br>=|NC contact 5-6<br>Sub card 1<br>NO contact 7-8<br>NO contact 9-10<br>Sub card 2<br>=<br>=||||=<br>=|=<br>=|Armature<br>NO contact 12-11<br>Main card<br>NC contact 16-15<br>NO contact 14-13|Armature<br>NO contact 12-11<br>Main card<br>NC contact 16-15<br>NO contact 14-13|Armature<br>NO contact 12-11<br>Main card<br>NC contact 16-15<br>NO contact 14-13|Armature<br>NO contact 12-11<br>Main card<br>NC contact 16-15<br>NO contact 14-13|5<br>6|**Remark:**<br>**Only NC 5-6 monitors**<br>**all NO contacts!**<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>Lid<br>|<br>ett|**Remark:**<br>**Only NC 5-6 monitors**<br>**all NO contacts!**<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>Lid<br>|<br>ett|**Remark:**<br>**Only NC 5-6 monitors**<br>**all NO contacts!**<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>Lid<br>|<br>ett|**Remark:**<br>**Only NC 5-6 monitors**<br>**all NO contacts!**<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>Lid<br>|<br>ett||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|**Legend for interpreting contact conditions**|||||||||||||||||
|Contact||NC (Normally Closed)|||||||||NO (Normally Open)||||||
|Condition<br>Closed||Fully open|Open||Open or closed|||Closed|||Fully open<br>Open|||Open or closed|||
|Symbol<br>Contact gap<br>0<br>Maximum<br>(~1.5mm)<br>>0.5mm<br>(forcibly guided)<br>Not defined<br>0<br>Maximum<br>(~1.5mm)<br>>0.5mm<br>(forcibly guided)<br>Not defined<br>~~Hnnn~~nnne<br>a<br>ee<br>ee|||||||||||||||||
|**The SFN4D under normal operating conditions**|||||||||||||||||
|**Condition**|||**Illustration of Relay State**|||||||||**Condition of Contacts**|||||
|- Coil deenergized.|||||||||||||||||
|- Armature in deenergized|||||||||||||||||
|position.|||||||||||||||||
|- NC contacts closed.|||||||||||||||||
|- NO contacts have a contact||||||||||||5<br>7<br>9<br>12<br>14|16||||
|gap of approx. 1.5mm.||||||||||||6<br>8<br>10<br>11<br>13|15||||
|- Coil energized.|||||||||||||||||
|- Armature in energized|||||||||||||||||
|position.|||||||||||||||||
|- NO contacts closed.|||||||||||||||||
|- NC contacts have a contact||||||||||||5<br>7<br>9<br>12<br>14|16||||
|gap of approx. 1.5mm.||||||||||||6<br>8<br>10<br>11<br>13|15||||
## **Legend for interpreting contact conditions**
## **The SFN4D under normal operating conditions**
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## **The SFN4D safety relay with welded contacts**
|**Condition**|**Illustration of Relay State**|**Condition of Contacts**|
|---|---|---|
|- NC 5-6 welded.<br>- Coil energized.<br>- Armature nearly in<br>deenergized position.|ite<br>:<br>‘=<br>OT|- All NO contacts are forcibly<br>guided.<br>- The NO contact gaps are<br>min. 0.5mm.<br>- For NC 16-15, the contact<br>condition is not defined.<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>a~~n~~<br>|<br>|<br>| |<br>NEE EE Td|
|- NC 16-15 welded.<br>- Coil energized.<br>- Armature nearly in<br>deenergized position.|=<br>a ||- All NO contacts are forcibly<br>guided.<br>- The NO contact gaps are<br>min. 0.5mm.<br>- For NC 5-6, the contact<br>condition is not defined.<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>| PL dd Me|
|- NO 12-11 welded.<br>- Coil deenergized.<br>- Armature nearly in<br>energized position.|a|- All (both) NC contacts are<br>forcibly guided.<br>- The NC contact gaps are min.<br>0.5mm.<br>- For all NO contacts, the<br>contact condition is not<br>defined.<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>Pi aT|
|- NO 14-13 welded.<br>- Coil deenergized.<br>- Armature in nearly<br>energized position.|as ||- All (both) NC contacts are<br>forcibly guided.<br>- The NC contact gaps are min.<br>0.5mm.<br>- For all NO contacts, the<br>contact condition is not<br>defined.<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>|Lie|
|- NO 7-8 welded.<br>- Coil deenergized.<br>- Armature in deenergized<br>position.||<br>am<br>12<br>||**- NC 16-15 is closed!!**<br>**- All non-welded NO**<br>**contacts show their max.**<br>**contact gap.**<br>- NC 5-6 forcibly guided to the<br>welded contact by sub card 1.<br>The contact gap is min.<br>0.5mm.<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>~~a~~e<br>|<br>| H<br>OSE TI|
|- NO 9-10 welded.<br>- Coil deenergized.<br>- Armature in deenergized<br>position.|:<br>—<br>=<br>a ||**- NC 16-15 is closed!!**<br>**- All non-welded NO**<br>**contacts show their max.**<br>**contact gap.**<br>- NC 5-6 forcibly guided to the<br>welded contact by sub card 2.<br>The contact gap is min.<br>0.5mm.<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>~~a~~r<br>| H<br>|<br>| KET|
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SFN4D
## **Failure modes, application examples**
_1) Feedback loop, 2) Self-holding circuit, 3) Safety circuit, 4) Auxiliary contacts_
|1. Self-holding circuit, three safety circuits<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>6<br>5<br>13<br>14<br>11<br>12<br>9<br>10<br>7<br>8<br>16<br>15<br>**K1**<br>**K2**<br>_1)_<br>_2)_<br>_2)_<br>_3)_<br>_3)_<br>_3)_<br>_4)_|One contact welded, e.g. NO 9-10 of K1.|Condition of contacts at deenergized coil<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>6<br>5<br>13<br>14<br>11<br>12<br>9<br>10<br>7<br>8<br>16<br>15<br>**K1**<br>**K2**|
|---|---|---|
||One contact welded, e.g. NO 12-11 of K2.|Condition of contacts at deenergized coil<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>6<br>5<br>13<br>14<br>11<br>12<br>9<br>10<br>7<br>8<br>16<br>15<br>**K1**<br>**K2**|
|2.1. Four safety circuits<br>(see wiring example, p. 8)<br>_1)_<br>_3)_<br>_3)_<br>_3)_<br>_3)_<br>_4)_<br>**K1**<br>**K2**<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>6<br>5<br>13<br>14<br>11<br>12<br>9<br>10<br>7<br>8<br>16<br>15|One contact welded, e.g. NO 9-10 of K1.|Condition of contacts at deenergized coil<br>6<br>5<br>13<br>14<br>11<br>12<br>9<br>10<br>7<br>8<br>16<br>15<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>**K1**<br>**K2**|
||One contact welded, e.g. NO 12-11 of K2.|Condition of contacts at deenergized coil<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>6<br>5<br>13<br>14<br>11<br>12<br>9<br>10<br>7<br>8<br>16<br>15<br>**K1**<br>**K2**|
|2.2. Two safety circuits<br>(see wiring example, p. 8)<br>_1)_<br>_3)_<br>_3)_<br>_4)_<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>6<br>5<br>13<br>14<br>11<br>12<br>9<br>10<br>7<br>8<br>16<br>15<br>{<br>{<br>**K1**<br>**K2**|Both contacts of one path are welded,<br>e.g. NO 7-8 and NO 14-13.<br>A safety circuit needs two paths in this<br>failure mode. The contacts 9-10, 12-11,<br>and 14-13 of K1 interrupt the load.|Condition of contacts at deenergized coil<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>6<br>5<br>13<br>14<br>11<br>12<br>9<br>10<br>7<br>8<br>16<br>15<br>**K1**<br>**K2**|
||Both contacts of one path are welded,<br>e.g. NO 9-10 and NO 12-11.<br>A safety circuit needs two paths in this<br>failure mode. The contacts 7-8, 12-11,<br>and 14-13 of K1 interrupt the load.|Condition of contacts at deenergized coil<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>13<br>14<br>15<br>16<br>6<br>5<br>13<br>14<br>11<br>12<br>9<br>10<br>7<br>8<br>16<br>15<br>**K1**<br>**K2**|
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## **Wiring for application examples 2.1 and 2.2**
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**----- Start of picture text -----**<br>
1+ -2<br>5 6 11 12<br>7 8 13 14<br>9 10 15 16<br>16 15 10 9<br>14 13 8 7<br>12 11 6 5<br>-2 +1<br>1st layer<br>2nd layer<br>**----- End of picture text -----**<br>
## **For Cautions for Use, see Relay Technical Information.**
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Updated at April 23, 2026
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