# Power Relay, SPST-NO, 12 VDC, 33 A, LF-G Series, Through Hole, Non Latching

![Product image](https://novapart.co/image/farnell:4203981/)

**URL**: https://novapart.co/products/ALFG2PF121/power-relay-spst-no-12-vdc-33-a-lf-g-series
**SKU**: ALFG2PF121
**Manufacturer**: PANASONIC
**Category**: Switches & Relays || Relays || Power Relays
**Price**: €5.6500
**Stock**: 100+
**Lead Time**: 206 days (indicative)

## Specifications

| Parameter | Value |
|---|---|
| Svhc | To Be Advised |
| Coil Type | Non Latching |
| Coil Voltage | 12VDC |
| Product Range | LF-G Series |
| Relay Mounting | Through Hole |
| Coil Resistance | 103ohm |
| Contact Current | 33A |
| Relay Terminals | Solder |
| Contact Material | Silver Tin Oxide |
| Contact Voltage Vac | 250V |
| Contact Voltage Vdc | - |
| Contact Configuration | SPST-NO |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:4203981/)

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## Power relays ( Over 2 A ) LF-G RELAYS 

## Product Catalog 

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2022.4 

## **Power relays (Over 2 A)** 

## **LF-G[RELAYS]** 

## **Load for solar inverter, Compact size, 1 Form A 22 A/33 A, Power relays** 

## ~~**FEATURES**~~ 

Protective construction：Flux-resistant type **High capacity control possible at 22 A/33 A (High capacity type) 250 V AC rating in compact size Contact GAP: 1.5 mm, 1.8 mm 30.1 15.7 Compliant with photovoltaic standard (IEC62109 and VDE0126) Coil holding voltage contributes to saving energy of equipment 23.3 Conforms to various safety standards: UL/C-UL and VDE** ~~**TYPICAL APPLICATIONS**~~ So ~~_~~ **Photovoltaic power generation systems** ~~_~~ **(Solar inverter) Uninterruptible Power Supplies (UPS) Home appliances** （Unit：mm） **Office equipment** 

## **DETAILS FEATURES** 

## **Contact GAP: 1.5 mm, 1.8 mm*[1]** 

Compliant with European photovoltaic standard (IEC62109*[2] and VDE0126*[3] ). 

EN61810-1 certified: 2.5 kV surge withstand voltage (between contacts) 

- *1. Safety standard of PV power inverter 

- *2. German safety standard of PV power inverter 

- *3. Due to addition of altitude stipulation (Min. 2,000 m) to IEC62109. 

## **Coil holding voltage*[1] contributes to saving energy of equipment** 

The coil holding voltage can be reduced up to 35% V of the rated coil voltage (Ambient temperature: 20°C*[2] ). Operating power at the lowest coil holding voltage: 170 mW equivalent 

- *1.  Coil holding voltage is the coil voltage after 100 ms from the applied rated coil voltage. 

- *2.  When the ambient temperature during use is 85°C, make the coil holding voltage between 45 to 80% V of the rated coil voltage. 

**High capacity control possible at 22 A/33 A (High capacity type) 250 V AC rating in compact size (L: 15.7 × W: 30.1 × H: 23.3 mm)** 

## **High insulation** 

Creepage distance between contact and coil terminal: Min. 9.5 mm 

Clearance distance between contact and coil terminal: Min. 6.5 mm 

Surge withstand voltage: 6 kV 

**ORDERING INFORMATION (PART NO.) ALFG P F** ~~Fe~~ Contact arrangement Terminal shape Coil insulation class Rated coil voltage（DC） Contact gap 1 : 1 Form A Standard type P：PCB type F：UL Class F 09：9V, 12：12V Nil : 1.5mm 2 : 1 Form A High capacity type 18：18V, 24：24V 1 : 1.8mm 

Note：Certified by UL/C-UL and VDE 

Panasonic Industry Co., Ltd. Electromechanical Control Business Division industrial.panasonic.com/ac/e/ 

> Panasonic Industry Co., Ltd. 2022 ASCTB196E   202204 

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Power relays (Over 2 A) LF-G RELAYS 

## **TYPES** 

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Part No. Standard packing<br>Contact  Rated coil<br>Contact GAP 1.5 mm Contact GAP 1.8 mm<br>arrangement voltage Inner carton Outer carton<br>Standard type High capacity type Standard type High capacity type<br>9 V DC ALFG1PF09 ALFG2PF09 ALFG1PF091 ALFG2PF091<br>12 V DC ALFG1PF12 ALFG2PF12 ALFG1PF121 ALFG2PF121<br>1 Form A 50 pcs. 200 pcs.<br>18 V DC ALFG1PF18 ALFG2PF18 ALFG1PF181 ALFG2PF181<br>24 V DC ALFG1PF24 ALFG2PF24 ALFG1PF241 ALFG2PF241<br>**----- End of picture text -----**<br>


## **RATING** 

## **Coil data** 

- Operating characteristics such as ‘Operate voltage’ and ‘Release voltage’ are influenced by mounting conditions, ambient temperature, etc. 

Therefore, please use the relay within ±5% of rated coil voltage. 

- ‘Initial’ means the condition of products at the time of delivery. 

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Rated coil voltage Operate voltage* (at 20°C) Release voltage* (at 20°C) Rated operating (±10%, at current 20°C) (±Coil resistance 10%, at 20°C) Rated operating power Max. allowable (at voltage 20°C)<br>9 V DC 155 mA 58 Ω<br>12 V DC Max. 70% V of Min. 10% V of  117 mA 103 Ω 120% V of rated<br>rated coil voltage  rated coil voltage  1,400 mW<br>18 V DC (Initial) (Initial) 78 mA 230 Ω coil voltage<br>24 V DC 59 mA 410 Ω<br>**----- End of picture text -----**<br>


*square, pulse drive 

Panasonic Industry Co., Ltd. Electromechanical Control Business Division industrial.panasonic.com/ac/e/ 

ASCTB196E   202204 

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Panasonic Industry Co., Ltd. 2022 

Power relays (Over 2 A) LF-G RELAYS 

## **Specifications** 

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Specifications<br>Item Standard type High capacity type<br>Contact GAP 1.5 mm, 1.8 mm Contact GAP 1.5 mm Contact GAP 1.8 mm<br>Contact arrangement 1 Form A<br>Contact resistance<br>(initial) Max. 100 mΩ (by voltage drop 6 V DC 1 A)<br>Contact material AgSnO2 type<br>Contact rating  22 A 250 V AC 31 A 250 V AC 33 A 250 V AC<br>(resistive)<br>Contact data<br>Max. switching power (resistive) 5,500 VA 7,750 VA 8,250 VA<br>Max. switching voltage 250V AC<br>Max. switching current 22 A (AC) 31 A (AC) 33 A (AC)<br>Min. switching load (reference value)* [1] 100 mA 5 V DC<br>Insulation resistance (initial) Min. 1,000 MΩ (at 500 V DC, Measured portion is the same as the case of dielectric strength.)<br>Between open contacts 2,500 Vrms for 1 min (detection current: 10 mA)<br>Dielectric<br>strength (initial) Between contact and coil 4,000 Vrms for 1 min (detection current: 10 mA)<br>Surge withstand voltage (initial)* [2] Between contact and coil 6,000 V<br>35 to 120% V (at 20°C, contact  35 to 120% V (at 20°C, contact  35 to 120% V (at 20°C, contact<br>carrying current 22 A) carrying current 31 A) carrying current 33 A)<br>Coil holding voltage* [3] 45 to 80% V (at 85°C, contact  45 to 80% V (at 85°C, contact  45 to 80% V (at 85°C, contact<br>carrying current 22 A) carrying current 31 A) carrying current 33 A)<br>Time  Operate time Max. 20 ms at rated coil voltage (at 20°C, without bounce)<br>characteristics<br> (initial) Release time Max. 10 ms at rated coil voltage (at 20°C, without bounce, without diode)<br>Functional 100 m/s [2] (half-sine shock pulse: 11 ms, detection time: 10 μs)<br>Shock resistance<br>Destructive 1,000 m/s [2] (half-sine shock pulse: 6 ms)<br>Vibration  Functional 10 to 55 Hz (at double amplitude of 1.5 mm, detection time: 10 μs)<br>resistance Destructive 10 to 55 Hz (at double amplitude of 1.5 mm)<br>Expected life Mechanical life Contact GAP Contact GAP 11..58 mm: Min.  mm: Min. 10500 [6]  (switching frequency: x 10 [3] (switching frequenc180 times /min)y: 180 times/min)<br>Ambient temperature:  -40 to +60°C (When rated coil voltage applied)<br>Conditions Conditions for usage,  -40 to +85°C (Coil holding voltage is when 45 to 80% V of rated coil voltage is applied.)<br>transport and storage* [4] Humidity:5 to 85% RH (Avoid icing and condensation)<br>Unit weight Approx. 23 g<br>**----- End of picture text -----**<br>


*1. This value can change due to the switching frequency, environmental conditions, and desired reliability level, therefore it is recommended to check this with the actual load. 

*2. Wave is standard shock voltage of ±1.2×50 μs according to JEC-212-1981 

*3. Coil holding voltage is the coil voltage after 100 ms from the applied rated coil voltage. 

- *4. For ambient temperature, please read “GUIDELINES FOR RELAY USAGE”. 

## **Expected electrical life** 

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Type Contact GAP Load Switching capacity Number of operations<br>Resistive load 22 A 250 V AC Min. 30 x 10 [3] (switching frequency 20 times/min)<br>Standard<br>1.5 mm/1.8 mm Destructive 22 A 250 V AC (cosφ = 0.8) Min. 30 x 10 [3] (switching frequency ON : OFF = 0.1 s : 10 s)<br>type<br>Over load 35 A 250 V AC (cosφ = 0.8) Min. 50 (switching frequency ON : OFF = 0.1 s : 10 s)<br>Destructive 31 A 250 V AC (cosφ = 0.8) Min. 30 x 10 [3] (switching frequency ON : OFF = 0.1 s : 10 s)<br>1.5 mm<br>High capacity  Over load 47 A 250 V AC (cosφ = 0.8) Min. 50 (switching frequency ON : OFF = 0.1 s : 10 s)<br>type Destructive 33 A 250 V AC (cosφ = 0.8) Min. 30 x 10 [3] (switching frequency ON : OFF = 0.1 s : 10 s)<br>1.8 mm<br>Over load 50 A 250 V AC (cosφ = 0.8) Min. 50 (switching frequency ON : OFF = 0.1 s : 10 s)<br>**----- End of picture text -----**<br>


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> Panasonic Industry Co., Ltd. 2022 ASCTB196E   202204 

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Power relays (Over 2 A) LF-G RELAYS 

## **REFERENCE DATA** 

## **Standard type (Contact GAP 1.5 mm, 1.8 mm)** 

## 1-1.Electrical life test (22 A 250 V AC Resistive load) 

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Tested sample：ALFG1PF09, ALFG1PF091, 6 pcs. Change of operate and release voltage Change of contact resistance<br>Operation frequencyAmbient temperature：：85ON°：C OFF = 1.5s：1.5s 10 100<br>Circuit： 9 90<br>8 80<br>7 70<br>6 Operate voltage 60<br>Max.<br>5 Ave. 50<br>Min.<br>250V AC 4 40<br>9V DC 3 30<br>2 Release voltage Max.Ave. 20 Max.<br>Min. Ave.<br>1 10 Min.<br>0 0<br>0 3 0 3<br>No. of operations（×10 [4] ） No. of operations（×10 [4] ）<br>1-2.Electrical life test (22 A 250 V AC cosφ = 0.8 Inductive load)<br>Tested sample：ALFG1PF09, ALFG1PF091, 6 pcs. Change of operate and release voltage Change of contact resistance<br>Operation frequencyAmbient temperature：：85ON°：C OFF = 0.1s：10s 10 100<br>Circuit： 9 90<br>8 80<br>7 70<br>6 Operate voltage 60<br>Max.<br>5 Ave. 50<br>Min.<br>250V AC 4 40<br>9V DC 3 30<br>2 Release voltage Max.Ave. 20 Max.<br>Min. Ave.<br>1 10<br>Min.<br>0 0<br>0 3 0 3<br>No. of operations（×10 [4] ） No. of operations（×10 [4] ）<br>2. Coil temperature characteristics 3.Ambient temperature characteristics<br>(Average)<br>Tested sample：ALFG1PF09, ALFG1PF091, 6 pcs.<br>Measured portion：Coil inside<br>Contact current：22A<br>Ambient temperature：20℃, 60℃<br>100 20℃ 22A ＊ Inside the coil temperature 155℃（UL Class F）<br>180<br>Allowable ambient temperatures<br>60℃ 22A against % coil voltages<br>80 （max. inside the coil<br>20℃ 0A 140 temperature set<br>60℃ 0A as 155℃）<br>Contact current：22A<br>60<br>100<br>Operate voltage<br>40 60 Coil & contact<br>0A<br>2060 80 100 120 140 00 10 20 30 40 50 60 70 80 90<br>Coil applied voltage（%V） Ambient temperature（℃）<br>）<br>V<br>（ Ω）<br>m<br>（<br>Contact<br>Contact resistance<br>detection circuit Operate and release voltage<br>and Mis-contactingwelding detection<br>）<br>V<br>（ Ω）<br>m<br>（<br>Contact<br>Contact resistance<br>detection circuit Operate and release voltage<br>and Mis-contactingwelding detection<br>）<br>%V<br>（<br>（℃）<br>Temperature rise<br>Coil applied voltage<br>**----- End of picture text -----**<br>


Panasonic Industry Co., Ltd. Electromechanical Control Business Division industrial.panasonic.com/ac/e/ 

ASCTB196E   202204 

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Panasonic Industry Co., Ltd. 2022 

Power relays (Over 2 A) LF-G RELAYS 

## **High capacity type** 

Contact GAP 1.5 mm 

- 1.Electrical life test (31 A 250 V AC cosφ = 0.8 Inductive load) 

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Tested sample：ALFG2PF09, 6 pcs. Change of operate and release voltage Change of contact resistance<br>Operation frequencyAmbient temperature：：ON85℃：OFF = 0.1s：10s 10 100<br>9 90<br>8 80<br>7 70<br>6 Operate voltage Max. 60<br>Ave.<br>5 50<br>Min.<br>250V AC 4 40<br>9V DC 3 30<br>Release voltage Max. Max.<br>2 Ave. 20<br>Min.<br>Ave.<br>1 10<br>Min.<br>0 0<br>0 3 0 3<br>No. of operations（×10 [4] ） No. of operations（×10 [4] ）<br>2. Coil temperature characteristics 3.Ambient temperature characteristics<br>(Average)<br>Tested ｓample：ALFG2PF09, 6 pcs.<br>Measured portion：Coil inside<br>Contact current：31A<br>Ambient temperature：20℃, 60℃<br>100 20℃ 31A ＊ Inside the coil temperature 155℃（UL Class F）<br>180<br>60℃ 31A<br>80 Allowable ambient temperatures<br>20℃ 0A against % coil voltages<br>140 （max. inside the coil<br>60℃ 0A temperature set<br>Contact current：31A as 155℃）<br>60<br>100<br>Operate voltage<br>40 60 Coil & contact<br>0A<br>2060 80 100 120 140 00 10 20 30 40 50 60 70 80 90<br>Coil applied voltage（%V） Ambient temperature（℃）<br>Contact GAP 1.8 mm<br>1.Electrical life test (33 A 250 V AC cosφ = 0.8 Inductive load)<br>Tested sample：ALFG2PF091, 6 pcs. Change of operate and release voltage Change of contact resistance<br>Ambient temperatureOperation frequency：：ON85℃：OFF = 0.1s：10s 10 100<br>Circuit： 9 90<br>8 80<br>7 70<br>6 Operate voltage 60<br>Max.<br>5 Ave. 50<br>Min.<br>250V AC 4 40<br>9V DC 3 30<br>Release voltage Max.<br>2 Ave.Min. 20 Max.<br>1 10 Ave.<br>Min.<br>0 0<br>0 3 0 3<br>No. of operations（×10 [4] ） No. of operations（×10 [4] ）<br>）<br>V<br>（ Ω）<br>m<br>（<br>Contact<br>Contact resistance<br>detection circuit Operate and release voltage<br>and Mis-contactingwelding detection<br>）<br>%V<br>（<br>（℃）<br>Temperature rise  Coil applied voltage<br>）<br>V<br>（ Ω）<br>m<br>（<br>Contact<br>Contact resistance<br>detection circuit Operate and release voltage<br>and Mis-contactingwelding detection<br>**----- End of picture text -----**<br>


Panasonic Industry Co., Ltd. Electromechanical Control Business Division industrial.panasonic.com/ac/e/ 

ASCTB196E   202204 

Panasonic Industry Co., Ltd. 2022 

ー 5 ー 

Power relays (Over 2 A) LF-G RELAYS 

## 2. Coil temperature characteristics 

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3. Ambient temperature characteristics<br>**----- End of picture text -----**<br>


(Average) 

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Tested sample：ALFG2PF091, 6 pcs.<br>Measured portion：Coil inside<br>Contact current：33A<br>Ambient temperature：20℃, 60℃<br>120 ＊ Inside the coil temperature 155℃（UL Class F）<br>180<br>20℃ 33A<br>100 P| Po<br>Allowable ambient temperatures<br>fd 60℃ 33A . against % coil voltages -<br>140 （max. inside the coil<br>80 temperature set<br>Z| 20℃ 0A Contact current：33A as 155℃）<br>60℃ 0A<br>100<br>60 yA Operate voltage<br>| 60 pp Coil & contact<br>40 0A<br>ao 2060 Ff 80 100 tte 120 140 00 10 il 20 ait 30 40 50 60 70 a 80 90<br>Coil applied voltage（%V） Ambient temperature（℃）<br>Ri DIMENSIONS «= CAD  The CAD data of the products with a “CAD” mark can be downloaded from our Website. Unit: mm<br>ed CAD a-_WVJT_—————} External dimensions Recommended PC board pattern (BOTTOM VIEW) (BOTTOM VIEW)Schematic<br>27.6<br>2dia. 13.8 2dia.<br>0.8 0.8 1.6 0.3 1.8dia. 12 10 1.8dia.<br>1.6 1.6 12<br>22 Tolerance ±0.1<br>;/ 27.6 |<br>30.1<br>General tolerance<br>Less than 1mm：±0.1<br>Min. 1mm less than 3mm：±0.2<br>ieo )oam 2 .S Min. 3mm：±0.3<br>）<br>%V<br>（<br>（℃）<br>Temperature rise  Coil applied voltage<br>23.3<br>0.5 12<br>4<br>15.7<br>**----- End of picture text -----**<br>


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Unit: mm<br>**----- End of picture text -----**<br>


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ASCTB196E   202204 

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Panasonic Industry Co., Ltd. 2022 

Power relays (Over 2 A) LF-G RELAYS 

## **SAFETY STANDARDS** 

Each standard may be updated at any time, so please check our Website for the latest information. 

## **UL/C-UL (Recognized)** 

|**UL/C-UL (Recognized)**|**UL/C-UL (Recognized)**|**UL/C-UL (Recognized)**|**UL/C-UL (Recognized)**|
|---|---|---|---|
|Standard type||||
|File No.|Contact rating|Operations|Ambient<br>temperature|
|E43028|22A277V AC General use|30×103|85°C|
||22A30V DC Resistive|30×103|40°C|



## High capacity type 

## Contact GAP 1.5 mm 

|File No.|Contact rating|Operations|Ambient<br>temperature|
|---|---|---|---|
|E43028|31A277V AC General use|30×103|85°C|



## Contact GAP1.8 mm 

|File No.|Contact rating|Operations|Ambient<br>temperature|
|---|---|---|---|
|E43028|33A277V AC General use|30×103|85°C|



## **CSA (Certified)** 

CSA standard certified by C-UL 

## **VDE (Certified)** 

|**VDE (Certifed)**|**VDE (Certifed)**|**VDE (Certifed)**|**VDE (Certifed)**|
|---|---|---|---|
|Standard type||||
|File No.|Contact rating|Operations|Ambient<br>temperature|
|40023067|22A250V AC (cosφ =0.8)|30×103|85°C|



High capacity type 

## Contact GAP 1.5 mm 

|File No.|Contact rating|Operations|Ambient<br>temperature|
|---|---|---|---|
|40023067|31A250V AC (cosφ =0.8)|30×103|85°C|



## Contact GAP1.8 mm 

|File No.|Contact rating|Operations|Ambient<br>temperature|
|---|---|---|---|
|40023067|33A250V AC (cosφ =0.8)|30×103|85°C|



## **INSULATION CHARACTERISTICS (IEC61810-1)** 

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Item Characteristics<br>Clearance/Creepage distance (IEC61810-1) Min. 5.5/5.5 mm<br>Category of protection (IEC61810-1) RT II<br>Tracking resistance (IEC60112) PTI 175<br>Insulation material group III a<br>Over voltage category III<br>Rated voltage 250 V<br>Pollution degree 2<br>Type of insulation (Between contact and coil) Reinforced insulation<br>Type of insulation (Between open contacts) Full disconnection<br>**----- End of picture text -----**<br>


Note: Actual value 

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> Panasonic Industry Co., Ltd. 2022 ASCTB196E   202204 

ー 7 ー 

Power relays (Over 2 A) LF-G RELAYS 

## **GUIDELINES FOR USAGE** 

**For cautions for use, please read “GUIDELINES FOR RELAY USAGE”. https://industrial.panasonic.com/ac/e/control/relay/cautions_use/index.jsp** 

## **Cautions for usage of LF-G relays** 

Usage, transport and storage conditions 

## 1)  Temperature 

- -40 to +60°C (When rated coil voltage applied) 

- -40 to +85°C (When coil holding voltage is 45 to 80% V of rated coil voltage) 

## 2)  Humidity 

- 5 to 85% RH (Avoid icing and condensation) 

- Note:  The humidity range varies with the temperature. Use within the range indicated in the graph. 

- 3)  Atmospheric pressure 

- 86 to 106 kPa 

[Temperature and humidity range for usage, transport, and storage] 

- [When rated coil voltage applied] 

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Humidity（％RH）<br>85<br>Allowa bl e range<br>Avoid con-<br>Avoid icin [g] densation when<br>when used at used at tem-<br>temperatures peratures<br>lower than 0℃ higher than 0℃<br>5<br>ｰ40 0 60<br>Ambient temperature（℃）<br>**----- End of picture text -----**<br>


[When coil holding voltage is 45 to 80% V of rated coil voltage] Humidity (％ RH) 

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85<br>Allowa b le range<br>Avoid icing Avoid con­<br>when used at densation when<br>temperatures used at tem­<br>lower than 0°C peratures higher<br>than 0°C<br>5<br>­40 0 85<br>Ambient temperature (℃)<br>**----- End of picture text -----**<br>


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ー 8 ー 

ASCTB196E   202204 

Panasonic Industry Co., Ltd. 2022 

**GUIDELINES FOR POWER, HIGH-CAPACITY DC CUT OFF AND SAFETY RELAYS USAGE** 

**For cautions for use, please read “GUIDELINES FOR RELAY USAGE”. https://industrial.panasonic.com/ac/e/control/relay/cautions_use/index.jsp** 

## **Precautions for Coil Input** 

## **Long term current carrying** 

A circuit that will be carrying a current continuously for long periods without relay switching operation. (circuits for emergency lamps, alarm devices and error inspection that, for example, revert only during malfunction and output warnings with form B contacts) Continuous, long-term current to the coil will facilitate deterioration of coil insulation and characteristics due to heating of the coil itself. For circuits such as these, please use a magnetic-hold type latching relay. If you need to use a single stable relay, use a sealed type relay that is not easily affected by ambient conditions and make a failsafe circuit design that considers the possibility of contact failure or disconnection. 

## **DC Coil operating power** 

Steady state DC current should be applied to the coil. The wave form should be rectangular. If it includes ripple, the ripple factor should be less than 5%. 

However, please check with the actual circuit since the electrical characteristics may vary. The rated coil voltage should be applied to the coil and the set/reset pulse time of latching type relay differs for each relays, please refer to the relay's individual specifications. 

## **Maximum allowable voltage and temperature rise** 

- Proper usage requires that the rated coil voltage be impressed on the coil. Note, however, that if a voltage greater than or equal to the maximum continuous voltage is impressed on the coil, the coil may burn or its layers short due to the temperature rise. Furthermore, do not exceed the usable ambient temperature range listed in the catalog. 

## **Operate voltage change due to coil temperature rise** 

- In DC relays, after continuous passage of current in the coil, if the current is turned OFF, then immediately turned ON again, due to the temperature rise in the coil, the operate voltage will become somewhat higher. Also, it will be the same as using it in a higher temperature atmosphere. The resistance/temperature relationship for copper wire is about 0.4% for 1°C, and with this ratio the coil resistance increases. That is, in order to operate of the relay, it is necessary that the voltage be higher than the operate voltage and the operate voltage rises in accordance with the increase in the resistance value. However, for some polarized relays, this rate of change is considerably smaller. 

## **Coil connection** 

When connecting coils of polarized relays, please check coil polarity (+,-) at the internal connection diagram (Schematic). If any wrong connection is made, it may cause  unexpected malfunction, like abnormal heat, fire and so on, and circuit do not work. Avoid impressing voltages to the set coil and reset coil at the same time. 

## **Ambient Environment** 

## **Usage, Transport, and Storage Conditions** 

During usage, storage, or transportation, avoid locations subjected to direct sunlight and maintain normal temperature, humidity and pressure conditions. 

## **Temperature/Humidity/Pressure** 

When transporting or storing relays while they are tube packaged, there are cases the temperature may differ from the allowable range. In this case be sure to check the individual specifications. Also allowable humidity level is influenced by temperature, please check charts shown below and use relays within mentioned conditions. (Allowable temperature values differ for each relays, please refer to the relay's individual specifications.) 

## 1) Temperature: 

The tolerance temperature range differs for each relays, please refer to the relay’s individual specifications 

## 2) Humidity: 5 to 85 % RH 

3) Pressure: 86 to 106 kPa 

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Humidity (％ RH)<br>85<br>Allowa b le range<br>Avoid icing Avoid con­<br>when used at densation when<br>temperatures used at tem­<br>lower than 0°C peratures higher<br>than 0°C<br>5<br>­40 0 85<br>Ambient temperature (℃)<br>**----- End of picture text -----**<br>


## **Dew condensation** 

Condensation occurs when the ambient temperature drops suddenly from a high temperature and humidity, or the relay is suddenly transferred from a low ambient temperature to a high temperature and humidity. Condensation causes the failures like insulation deterioration, wire disconnection and rust etc. 

Panasonic Industry Co., Ltd. does not guarantee the failures caused by condensation. 

The heat conduction by the equipment may accelerate the cooling of device itself, and the condensation may occur. 

Please conduct product evaluations in the worst condition of the actual usage. (Special attention should be paid when high temperature heating parts are close to the device. Also please consider the condensation may occur inside of the device.) 

## **Icing** 

Condensation or other moisture may freeze on relays when the temperature become lower than 0°C.This icing causes the sticking of movable portion, the operation delay and the contact conduction failure etc. Panasonic Industry Co., Ltd. does not guarantee the failures caused by the icing. 

The heat conduction by the equipment may accelerate the cooling of relay itself and the icing may occur. Please conduct product evaluations in the worst condition of the actual usage. 

## **Low temperature and low humidity** 

The plastic becomes brittle if the switch is exposed to a low temperature, low humidity environment for long periods of time. 

## **High temperature and high humidity** 

Storage for extended periods of time (including transportation periods) at high temperature or high humidity levels or in atmospheres with organic gases or sulfide gases may cause a sulfide film or oxide film to form on the surfaces of the contacts and/ or it may interfere with the functions. Check out the atmosphere in which the units are to be stored and transported. 

Panasonic Industry Co., Ltd. Electromechanical Control Business Division industrial.panasonic.com/ac/e/ 

ー 9 ー 

> Panasonic Industry Co., Ltd. 2022 ASCTB412E   202204 

## GUIDELINES FOR POWER, HIGH-CAPACITY DC CUT OFF AND SAFETY RELAYS USAGE 

## **Package** 

In terms of the packing format used, make every effort to keep the effects of moisture, organic gases and sulfide gases to the absolute minimum. 

## **Silicon** 

When a source of silicone substances (silicone rubber, silicone oil, silicone coating materials and silicone filling materials etc.) is used around the relay, the silicone gas (low molecular siloxane etc.) may be produced. 

This silicone gas may penetrate into the inside of the relay. When the relay is kept and used in this condition, silicone compound may adhere to the relay contacts which may cause the contact failure. Do not use any sources of silicone gas around the relay (Including plastic seal types). 

## **NOx Generation** 

When relay is used in an atmosphere high in humidity to switch a load which easily produces an arc, the NOx created by the arc and the water absorbed from outside the relay combine to produce nitric acid. 

This corrodes the internal metal parts and adversely affects operation. 

Avoid use at an ambient humidity of 85%RH or higher (at 20°C). If use at high humidity is unavoidable, please contact our sales representative. 

## **Others** 

## **Cleaning** 

- Although the environmentally sealed type relay (plastic sealed type, etc.) can be cleaned, avoid immersing the relay into cold liquid (such as cleaning solvent) immediately after soldering. Doing so may deteriorate the sealing performance. 

- Cleaning with the boiling method is recommended(The temperature of cleaning liquid should be 40°C or lower ). 

- Avoid ultrasonic cleaning on relays. Use of ultrasonic cleaning may cause breaks in the coil or slight sticking of the contacts due to ultrasonic energy. 

Please refer to **"the latest product specifications"** when designing your product. 

•Requests to customers: https://industrial.panasonic.com/ac/e/salespolicies/ 

Panasonic Industry Co., Ltd. Electromechanical Control Business Division industrial.panasonic.com/ac/e/ 

ー 10 ー 

ASCTB412E   202204 

Panasonic Industry Co., Ltd. 2022 

**==> picture [134 x 42] intentionally omitted <==**

Electromechanical Control Business Division 1006, Oaza Kadoma, Kadoma-shi, Osaka 571-8506, Japan industral.panasonic.com/ac/e/ 

Specifications are subject to change without notice. ASCTB196E   202204 

©Panasonic Industry Co., Ltd. 2022 

2022.4 



## Links

- [View this product on Novapart](https://novapart.co/products/ALFG2PF121/power-relay-spst-no-12-vdc-33-a-lf-g-series)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/panasonic/alfg2pf121/power-relay-spst-no-12vdc-33a/dp/4203981)
---

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