SF4D-DC18V

## **Polarized monostable safety relay with forcibly guided double contacts** 

## SF4D RELAY 

53.3 33 16.5 we ——~ length: 3.0 Tolerance 0.3mm Weight approx. 47g 

## **FEATURES** 

- **Relay complies with IEC 61810-3, Type B and with IEC/EN 603351 (GWT)** 

- **Overvoltage category as per IEC 60664-1  III / 4kV** 

- **Rated voltage as per IEC 60664-1 basic insulation** 

|||Polution degree<br>2<br>inside<br>3<br>inside<br>2<br>outside|Polution degree<br>2<br>inside<br>3<br>inside<br>2<br>outside|Polution degree<br>2<br>inside<br>3<br>inside<br>2<br>outside|
|---|---|---|---|---|
|Coil-contact||400V|400V|250V|
|Contact-contact|forcibly linked<br>pair only|250V|250V|250V|
||all other<br>contacts|400V|400V|400V|



## **SPECIFICATIONS** 

## **Contact** 

|**SPECIFICATIONS**<br>**Contact**||
|---|---|
|Contact configuration (a = normally open / NO,<br>b = normally closed / NC)|4a4b|
|Contact material|AgSnO2, with Au flash|
|Contact resistance (initial at 6V DC, 1A)|30m|
|Making and breaking capacities (breathing<br>hole open)*1|6A 250V / 3A 24V|
|Max. switching voltage|400V|
|Min. switching voltage / min. switching current|10V / 10mA|
|Pick-up / drop-out / bounce time<br>(approx. values at Unominal)|18.5 / 7.5 / 3ms|
|Mechanical life|107ops|



## **Coil** 

|**Coil**||
|---|---|
|Operate / release voltage (% of Unominalat<br>20°C)|75% / 15%|
|Pick-up/nominal power consumption at 20°C|280 / 500mW|



## **Remarks:** 

- *1 According to EN 60947-5-1: 1997, table 4 AC15 / DC13 

## **Characteristics** 

|**Characteristics**||
|---|---|
|Max. switching frequency (without load)|10Hz|
|Permissible ambient temperature at nominal<br>power consumption|-40°C to +70°C|
|Upper temperature limit|105°C|
|Test voltage:<br>open contact / contact-contact / contact-coil|2500 / 2500 /<br>2500Vrms|
|Insulation resistance at 500V DC (initial)|109|
|Shock resistance (11ms)  NO/NC*2|30G|
|Vibration resistance 10 – 200 Hz (10 – 55 Hz,<br>amplitude 2 mm)*2|10G|
|Degree of protection|IP67 / IP30*3|
|Unit weight|47g|



## **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) 

## **Note:** 

Suitable for most common washing methods except ultrasonic cleaning. 

- *2 Contact interruption <10s 

- *3 Breathing hole open 

## **ORDERING INFORMATION** 

Ex. SF4D DC12 V 

Coil voltage (DC) 5, 9, 12, 18, 21 24, 36, 48, 60 

Note: Standard packing; Carton: 20 pcs. Case 200 pcs. 

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## **COIL DATA** 

|**COIL DATA**||||||
|---|---|---|---|---|---|
|Part number|Coil nominal voltage<br>V DC|Operate voltage<br>V DC|Release voltage<br>V DC|Coil resistance<br>(10%, 20°C)|Coil inductance<br>(mH)|
|SF4D-DC5V|5|3.75|0.75|50|47|
|SF4D-DC9V|9|6.75|1.35|162|145|
|SF4D-DC12V|12|9.00|1.80|288|252|
|SF4D-DC18V|18|13.50|2.70|648|551|
|SF4D-DC21V|21|15.75|3.15|882|742|
|SF4D-DC24V|24|18.00|3.60|1152|959|
|SF4D-DC36V|36|27.00|5.40|2592|2097|
|SF4D-DC48V|48|36.00|7.20|4608|3654|
|SF4D-DC60V|60|45.00|9.00|7200|5612|



## **ELECTRICAL LIFE** 

|Voltage|Current|Load type|Frequency|Duty cycle|No. of contacts|No. of ops.|
|---|---|---|---|---|---|---|
|230V AC|8A|AC 1|0.25Hz|25%|4*2|85,000*5|
|250V AC|6A|AC 1|0.33Hz|50%|4*2/ 8*3|100,000*5|
|230V AC|6A|AC 1|0.33Hz|10%|2*3|200,000*4,*5|
|230V AC|30 / 3A|AC 15*1|0.33Hz|10%|1*3|200,000*4,*5|
|24V DC|8A|DC 1|0.33Hz|10%|2*3|200,000*4,*5|
|24V DC|3A|DC 13*1|0.33Hz|10%|1*3|50,000*4,*5|
|24V DC|3A|L/R = 40ms|0.33Hz|10%|1*3|100,000*4,*5|



- *1 EN 60947-5-1: 1997; table C.1 

- *2 Breathing hole closed 

- *3 Breathing hole open 

- *4 Ambient temperature +70°C 

- *5 Dielectric strength according to EN61810-1:2004. 

## **REFERENCE DATA** 

## **Load limit curve** 

## **Coil voltage characteristics** 

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**----- Start of picture text -----**<br>
1.7<br>Permissible coil<br>1.6 voltage without<br>contact load<br>1.5 (nominal coil<br>resistance)<br>1.4 N<br>1.3 Permissible coil voltage<br>with contact load of 4 x 6A<br>1.21.1 (nominal coil resistance) \\\<br>\<br>1.0 \<br>0.9<br>0.8 Average value of pick-up voltage  \<br>without previous coil heating<br>0.7<br>0.6<br>0.5 \<br>Minor increase due to<br>0.4 temperature compensation<br>0.3 \<br>0.2 i<br>0.1 Average value of drop-out voltage without previous coil heating |<br>-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110<br>Ucoil / Ucoil rated<br>**----- End of picture text -----**<br>


Loads in the range under the curve can be switched safely. The arc will extinguish before the opposite contact makes. 

Permissable coil voltages and pick-up and drop-out characteristics at various ambient temperatures. 

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## **Contact current characteristics** 

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25 LTT PSAETE<br>LEE EPANEEE<br>EEE<br>Nel EETEEE<br>20 LET| PNETTANASD ETATSET<br>LTT TTT NER ET TEN TTT TT TT<br>LETTLEE WETANTTASINS ET<br>15 LEELEE EEETT TETEEEANNETTEANE ONE TT<br>LEE EET TTT Ne TN TTT TTT<br>LEELEE TONE IST TTT<br>EET TTT PTT TP PETA TTT<br>10 PEPE<br>LETTE Ne TTT<br>TCLU PR= TTTS Ucoil = 0%,  TTT Load on NC 5 -6 STT TTTLEAR N et RET TTT<br>Ucoil = 100%,  Load on NO 7 - 8 LETT ALT<br>mal Ucoil = 100%, Load on all 4 NO TE<br>5 LL The curves are determined by LETRA<br>mal the contact resistance [TTT TEN A<br>Let| TTT AT<br>LEE<br>LEE<br>-50 LETTE -40 -30 -20 ET TTT -10 0 ee 10 20 30 40 50 60 70 80 90 100 110<br>Ambient temperature [°C]<br>Thermal continuous current  I th [A]<br>**----- End of picture text -----**<br>


## **DIMENSIONS** (mm inch) 

## Download Ga» **CAD Data** from our Web site. 

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4 Form A 4 Form B<br>**----- End of picture text -----**<br>


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GD CAD Data External dimensions<br>16±0.5<br>.630±.020<br>0.5<br>.020<br>.0391.0 i .2005.08 m .500 12.7 l .500 12.7 J .500 12.7 J 1.0.039 .1183.0± yt 0.5±.020<br>53.3±0.5 0.48<br>2.098±.020 .019<br>[| |<br>=) =) =) a \—! Schematic (Bottom view)<br>1.29933±±0.5.020 0.30.012 =e| 1 [oo]] 13 o 5 14 o 6 15 a 7 16 a 8 t .3007.62 a 13 0 o o 14 15 o a o 16 |<br>.3007.62 0.48.019 .50012.7 1+ 5 6 7 8<br>oO 2 o — Je |<br>a oa a a — |<br>9 10 11 12 7.62<br>17 18 19 20 .300 o<br>| I - 9 o o 10 11 o o 12 |<br>|  CL ao a a a } f | o 2 O]ea LS |<br>17 18 19 20<br>General tolerance: 0.3 .012 L +1 ms?! |<br>The contacts are shown in the deenergized condition.<br>o o o o<br>o o o o<br>**----- End of picture text -----**<br>


PC board pattern (Bottom view) 

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C o o [| o [| o Grid 2.54<br>TTT TPT yee Py eee et<br>LTT TTT Tir tT iter yt ee et<br>TTT o TPT yy o tT ryt o eer o et<br>o ENE<br>RENCE EEE<br>o [NTNeeAeT TTT TTT Pe eT TT<br>Livy o TT TTT o TT titer o eet o et<br>| EERE o  Eee o o eee o<br>HE EEE EH<br>| 7.6 1.4 - typical value for manual insertion<br>1.6 - typical value for automatic insertion<br>Tolerance: 0.1 .004<br>5.68<br>2.73<br>**----- End of picture text -----**<br>


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## **APPLICATION NOTES** 

Actuator 

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Outer contact<br>Inner contact<br>Rotating armature<br>**----- End of picture text -----**<br>


Nipple 

If required a breathing hole can be made in the cover by removing the nipple. However be aware that the degree of protection will be reduced from IP67 to IP30! 

## **Operation of forcibly guided contacts, Type B** 

**If an outer contact should weld** , then the forced operated inner contacts driven by the actuator remain open. The rotating armature remains free to move. 

The unaffected contact pairs can operate normally, i.e. their function to make or break remains unaffected. 

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Actuator<br>Outer contact<br>Inner contact<br>Rotating armature<br>**----- End of picture text -----**<br>


**If an inner contact should weld,** then the movement of the rotating armature is blocked via the actuator. Open contacts of all four contact pairs remain open. 

This arrangement corresponds to a conventional forcibly guided contact operation. 

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Actuator<br>Outer contact<br>Inner contact<br>Rotating armature<br>**----- End of picture text -----**<br>


## **SAFETY STANDARDS** 

|**SAFETY STANDARDS**|**SAFETY STANDARDS**|||
|---|---|---|---|
|UL/C-UL (Recognized)||TÜV (Certified)**||
|File No.|Contact rating|File No.|Rating|
|E120782*|6A 250V AC<br>6A 24V DC|968 EZ 116.00 01 (SF2D)<br>968 EZ 113.00 01 (SF4D)|8A 24V DC<br>6A 230V AC|



* CSA standard: Certified by C-UL 

- ** Test procedure A (Group Mounting) 

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## SF4D 

## **SAFETY STRUCTURE OF SF RELAYS** 

This SF relay design ensures that subsequent operations shut down and can automatically return to a safe state when the SF relay suffers overloading and other circuit abnormalities 

(unforeseen externally caused circuit or device breakdowns, end of life incidents, and noise, surge, and environmental influences) owing to contact welding, spring fusion or, in the worst-case 

scenario, relay breakdown (coil rupture, faulty operation, faulty return, and fatigue and breakage of the operating spring and return spring), and even in the event of end of life. 

||||Structure|Structure|Operation|
|---|---|---|---|---|---|
|1. Forced operation method<br>(2 Form A 2 Form B,<br>4 Form A 4 Form B types)|The two co<br>of each co||||Even when one contact is welded closed, the other<br>maintains a gap of greater than 0.5 mm.020 inch.<br>In the diagram on the left, the lower contact “b” have<br>welded but the upper contact “a” maintain at a gap of<br>greater than 0.5 mm.020 inch.<br>Subsequent contact movement is suspended and the<br>weld can be detected|
|||||||
|2. Independent operation method<br>(4 Form A 4 Form B type)|None of four contacts are held in position by the armature. Even though one<br>of the external N.O. contacts has welded, the other three contacts have<br>returned owing to the de-energizing of the coil.<br>Return<br>Return<br>External NO<br>contact weld<br>Return||||Enables design of safety circuits that allow weld<br>detection and return at an early stage.<br>As shown at the top right of the diagram on the left, if<br>the external N.O. contact welds, a 0.5 mm.020 inch<br>gap is maintained.<br>Each of the other contacts returns to N.O. because<br>the coil is no longer energized.|
|3. Separate chamber method<br>(2 Form A 2 Form B,<br>4 Form A 4 Form B types)|In independent chambers, the contacts “a” a<br>case separator or by the card itself.<br>Case separator<br>C<br>1|||nd “b” are kept apart by a body/<br>ard<br>Contact a<br>Body<br>separator<br>Contact b<br>2|Prevents shorting and fusing of springs and spring<br>failure owing to short-circuit current.<br>As shown on the diagram on the left, even if the<br>operating springs numbered 1 and 2 there is no<br>shorting between “a” and “b” contacts.|
|4. 2 Form A 2 Form B contact<br>4 Form A 4 Form B contact|Structure with independent COM contact of 2<br>4 Form A 4 Form B contacts.|||Form A 2 Form B and|Independent COM enables differing pole circuit<br>configurations. This makes it possible to design<br>various kinds of control circuits and safety circuits.|



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## **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.** 

## **4 Form A 4 Form B type** 

## Internal Contacts Weld 

When internal contacts (No. 2, No. 3, No. 6 or No. 7) are welded, the armature becomes non-operational and the four form “a” contact gaps are maintained at 0.5 mm .020inch or greater. Reliable cut-off is thus ensured. 

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**----- Start of picture text -----**<br>
No.8 No.1 No.8 No.1<br>No.7 No.2 No.7 No.2<br>Example: If the No. 2 contact welds.<br>Each of the four form “a” contacts (No. 1, 3, 5, and 7)<br>No.6 No.3 No.6 No.3 maintains a gap of greater than 0.5 mm .020 inch.<br>No.5 No.4 No.5 No.4<br>Non-energized Energized (when no. 2 contact is welded)<br>**----- End of picture text -----**<br>


## External Contacts Weld 

When external contacts (No. 1, No. 4, No. 5 or No. 8) are welded, gaps of 0.5 mm .020inch and greater are maintained between adjacent contacts and other contacts operate normally by the coil being non-energized. 

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**----- Start of picture text -----**<br>
No.8 No.1<br>No.7 No.2<br>No.6 No.3<br>No.5 No.4<br>Energized<br>**----- End of picture text -----**<br>


**Example 2: 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 .020 inch. 

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No.8 No.1<br>No.7 No.2<br>No.6 No.3<br>No.5 No.4<br>Non-energized (when no. 1 contact is welded)<br>**----- End of picture text -----**<br>


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**----- Start of picture text -----**<br>
Example 1: If the No. 1 contact welds.<br>**----- End of picture text -----**<br>


The adjacent No. 2 contact maintains a gap of greater than 0.5 mm .020 inch. The other contacts, because the coil is not energized, return to their normal return No.6 No.3 state; each of form “a” contacts (No. 3, 5, and 7) maintains a contact gap of greater than 0.5 mm No.5 No.4 .020 inch; each of the form “b” contacts (No. 4, 6, and 8) return to a closed state. Non-energized (when no. 1 contact is welded) Weld Energized Contact gap min 0.5 mm .020 inch Non-energized 

## Contact Operation Table 

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No.8 No.1<br>No.7 No.2<br>No.6 No.3<br>No.5 No.4<br>Contact No. No.1 No.2 No.3 No.4 No.5 No.6 No.7 No.8<br>Terminal No. 20–19 12–11 8–7 16–15 13–14 5–6 9–10 17–18<br>**----- End of picture text -----**<br>


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. 

|||1|2<br>>0.5|3<br>>0.|4<br>5<br>¦|5<br>>0.5|6<br>¦|7<br>>0.5|8<br>¦|
|---|---|---|---|---|---|---|---|---|---|
|Welded<br>terminal<br>No.|2<br>3|>0.5|>0.5|>0.|5<br>>0.5|>0.5|>0.5|>0.5|>0.5|
||4|¦|>0.5|>0.|5|¦|>0.5|¦|>0.5|
||5|>0.5|¦|>0.|5<br>¦||>0.5|>0.5|¦|
||6|>0.5||>0.|5|>0.5||>0.5||
||7||>0.5||>0.5||>0.5||>0.5|
||8|>0.5|>0.5|¦|>0.5|¦|>0.5|>0.5||



* 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. 

## **For Cautions for Use, see Relay Technical Information.** 

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