Power relays ( Over 2 A )
LF-G RELAYS
Product Catalog
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
Compliant with photovoltaic standard (IEC62109 and
VDE0126)
Coil holding voltage contributes to saving energy of
equipment
Conforms to various safety standards: UL/C-UL and
VDE
15.7
30.1
23.3
TYPICAL APPLICATIONS
（Unit：mm）
Photovoltaic power generation systems
(Solar inverter)
Uninterruptible Power Supplies (UPS)
Home appliances
Office equipment
DETAILS FEATURES
Contact GAP: 1.5 mm, 1.8 mm*1
Compliant with European photovoltaic standard (IEC62109*
and VDE0126*3).
EN61810-1 certified: 2.5 kV surge withstand voltage (between
contacts)
2
oil holding voltage*1 contributes to saving energy of
C
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. 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.
*1. Coil holding voltage is the coil voltage after 100 ms from the applied rated coil
voltage.
*2. W hen the ambient temperature during use is 85°C, make the coil holding
voltage between 45 to 80% V of the rated coil voltage.
igh capacity control possible at 22 A/33 A (High
H
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
Contact arrangement
Terminal shape
1 : 1 Form A Standard type
P：PCB type
2 : 1 Form A High capacity type
Coil insulation class
F：UL Class F
Rated coil voltage（DC）
09：9V, 12：12V
18：18V, 24：24V
Contact gap
Nil : 1.5mm
1 : 1.8mm
Note：Certified by UL/C-UL and VDE
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Power relays (Over 2 A) LF-G RELAYS
TYPES
Contact
arrangement
1 Form A
Rated coil
voltage
Part No.
Contact GAP 1.5 mm
Standard packing
Contact GAP 1.8 mm
Standard type
High capacity type
Standard type
High capacity type
9 V DC
ALFG1PF09
ALFG2PF09
ALFG1PF091
ALFG2PF091
12 V DC
ALFG1PF12
ALFG2PF12
ALFG1PF121
ALFG2PF121
18 V DC
ALFG1PF18
ALFG2PF18
ALFG1PF181
ALFG2PF181
24 V DC
ALFG1PF24
ALFG2PF24
ALFG1PF241
ALFG2PF241
Inner carton
Outer carton
50 pcs.
200 pcs.
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.
Rated coil
voltage
9 V DC
12 V DC
18 V DC
24 V DC
Operate voltage*
(at 20°C)
Release voltage*
(at 20°C)
Max. 70% V of
rated coil voltage
(Initial)
Min. 10% V of
rated coil voltage
(Initial)
Rated operating
current
(±10%, at 20°C)
Coil resistance
(±10%, at 20°C)
155 mA
58 Ω
117 mA
103 Ω
78 mA
230 Ω
59 mA
410 Ω
Rated operating
power
Max. allowable
voltage
(at 20°C)
1,400 mW
120% V of rated
coil voltage
*square, pulse drive
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Power relays (Over 2 A) LF-G RELAYS
Specifications
Specifications
Item
Standard type
High capacity type
Contact GAP 1.5 mm, 1.8 mm
Contact data
Contact GAP 1.5 mm
Contact arrangement
1 Form A
Contact resistance
(initial)
Max. 100 mΩ (by voltage drop 6 V DC 1 A)
Contact GAP 1.8 mm
Contact material
AgSnO2 type
Contact rating
(resistive)
22 A 250 V AC
31 A 250 V AC
33 A 250 V AC
Max. switching power
(resistive)
5,500 VA
7,750 VA
8,250 VA
31 A (AC)
33 A (AC)
Max. switching voltage 250V AC
Max. switching current
22 A (AC)
Min. switching load
(reference value)*1
100 mA 5 V DC
Insulation resistance (initial)
Min. 1,000 MΩ (at 500 V DC, Measured portion is the same as the case of dielectric strength.)
Between open contacts 2,500 Vrms for 1 min (detection current: 10 mA)
Dielectric
strength (initial)
Surge withstand
voltage (initial)*2
Between contact and
coil
4,000 Vrms for 1 min (detection current: 10 mA)
Between contact and
coil
6,000 V
35 to 120% V (at 20°C, contact
carrying current 22 A)
45 to 80% V (at 85°C, contact
carrying current 22 A)
Coil holding voltage*3
Time
characteristics
(initial)
Shock resistance
35 to 120% V (at 20°C, contact
carrying current 31 A)
45 to 80% V (at 85°C, contact
carrying current 31 A)
35 to 120% V (at 20°C, contact
carrying current 33 A)
45 to 80% V (at 85°C, contact
carrying current 33 A)
Operate time
Max. 20 ms at rated coil voltage (at 20°C, without bounce)
Release time
Max. 10 ms at rated coil voltage (at 20°C, without bounce, without diode)
Functional
100 m/s2 (half-sine shock pulse: 11 ms, detection time: 10 μs)
Destructive
1,000 m/s2 (half-sine shock pulse: 6 ms)
Vibration
resistance
Functional
10 to 55 Hz (at double amplitude of 1.5 mm, detection time: 10 μs)
Destructive
10 to 55 Hz (at double amplitude of 1.5 mm)
Expected life
Mechanical life
Contact GAP 1.5 mm: Min. 106 (switching frequency:180 times /min)
Contact GAP 1.8 mm: Min. 500 x 103 (switching frequency: 180 times/min)
Conditions
Conditions for usage,
transport and storage*4
Ambient temperature: -40 to +60°C (When rated coil voltage applied)
-40 to +85°C (Coil holding voltage is when 45 to 80% V of rated coil voltage is applied.)
Humidity:5 to 85% RH (Avoid icing and condensation)
Unit weight
Approx. 23 g
*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
Type
Standard
type
High capacity
type
Contact GAP
1.5 mm/1.8 mm
1.5 mm
1.8 mm
Load
Switching capacity
Number of operations
Resistive load
22 A 250 V AC
Min. 30 x 103 (switching frequency 20 times/min)
Destructive
22 A 250 V AC (cosφ = 0.8)
Min. 30 x 103 (switching frequency ON : OFF = 0.1 s : 10 s)
Over load
35 A 250 V AC (cosφ = 0.8)
Min. 50 (switching frequency ON : OFF = 0.1 s : 10 s)
Destructive
31 A 250 V AC (cosφ = 0.8)
Min. 30 x 103 (switching frequency ON : OFF = 0.1 s : 10 s)
Over load
47 A 250 V AC (cosφ = 0.8)
Min. 50 (switching frequency ON : OFF = 0.1 s : 10 s)
Destructive
33 A 250 V AC (cosφ = 0.8)
Min. 30 x 103 (switching frequency ON : OFF = 0.1 s : 10 s)
Over load
50 A 250 V AC (cosφ = 0.8)
Min. 50 (switching frequency ON : OFF = 0.1 s : 10 s)
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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)
9V DC
Operate and release voltage（V）
Contact
welding detection
and Mis-contacting
detection circuit
250V AC
Change of contact resistance
Change of operate and release voltage
10
100
9
90
8
7
6
Operate voltage
Max.
Ave.
Min.
5
4
3
Release voltage
2
Max.
Ave.
Min.
1
0
0
No. of operations（×104）
Contact resistance（mΩ）
Tested sample：ALFG1PF09, ALFG1PF091, 6 pcs.
Operation frequency：ON：OFF = 1.5s：1.5s
C
Ambient temperature：85°
Circuit：
80
70
60
50
40
30
20
Max.
Ave.
Min.
10
0
3
0
No. of operations（×104）
3
1-2.Electrical life test (22 A 250 V AC cosφ = 0.8 Inductive load)
9V DC
Operate and release voltage（V）
Contact
welding detection
and Mis-contacting
detection circuit
250V AC
Change of contact resistance
Change of operate and release voltage
10
100
9
90
8
7
Operate voltage
6
Max.
Ave.
Min.
5
4
3
Release voltage
2
Max.
Ave.
Min.
1
0
2.Coil temperature characteristics
(Average)
0
No. of operations（×104）
3
Contact resistance（mΩ）
Tested sample：ALFG1PF09, ALFG1PF091, 6 pcs.
Operation frequency：ON：OFF = 0.1s：10s
C
Ambient temperature：85°
Circuit：
80
70
60
50
40
30
Max.
20
Ave.
10
0
Min.
0
No. of operations（×104）
3
3.Ambient temperature characteristics
Tested sample：ALFG1PF09, ALFG1PF091, 6 pcs.
Measured portion：Coil inside
Contact current：22A
Ambient temperature：20℃, 60℃
60℃ 22A
80
20℃ 0A
60℃ 0A
60
40
20
60
＊Inside the coil temperature 155℃
（UL Class F）
20℃ 22A
Coil applied voltage（%V）
Temperature rise（℃）
100
180
Allowable ambient temperatures
against % coil voltages
（max. inside the coil
temperature set
as 155℃）
Contact current：22A
140
100
Operate voltage
60
80
100
120
Coil applied voltage（%V）
140
0
Coil & contact
0A
0
10
20 30 40 50 60 70 80 90
Ambient temperature（℃）
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ASCTB196E 202204
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)
Contact
welding detection
and Mis-contacting
detection circuit
250V AC
9V DC
Operate and release voltage（V）
Change of operate and release voltage
Change of contact resistance
10
100
9
90
8
7
Operate voltage
6
Max.
Ave.
5
Min.
4
3
Release voltage
Contact resistance（mΩ）
Tested sample：ALFG2PF09, 6 pcs.
Operation frequency：ON：OFF = 0.1s：10s
Ambient temperature：85℃
Max.
Ave.
Min.
2
70
60
50
40
30
Max.
20
Ave.
10
1
0
80
0
No. of operations（×10 ）
0
3
Min.
0
4
2.Coil temperature characteristics
(Average)
No. of operations（×10 ）
3
4
3.Ambient temperature characteristics
Testedｓample：ALFG2PF09, 6 pcs.
Measured portion：Coil inside
Contact current：31A
Ambient temperature：20℃, 60℃
＊Inside the coil temperature 155℃
（UL Class F）
20℃ 31A
60℃ 31A
80
20℃ 0A
60℃ 0A
60
Coil applied voltage（%V）
Temperature rise（℃）
100
40
20
60
180
Allowable ambient temperatures
against % coil voltages
（max. inside the coil
temperature set
as 155℃）
Contact current：31A
140
100
Operate voltage
Coil & contact
0A
60
80
100
120
Coil applied voltage（%V）
0
140
0
10
20 30 40 50 60 70 80 90
Ambient temperature（℃）
Contact GAP 1.8 mm
1.Electrical life test (33 A 250 V AC cosφ = 0.8 Inductive load)
Operate and release voltage（V）
9V DC
Contact
welding detection
and Mis-contacting
detection circuit
250V AC
Change of contact resistance
Change of operate and release voltage
10
100
9
90
8
7
Operate voltage
6
Max.
Ave.
Min.
5
4
3
Release voltage
Max.
Ave.
Min.
2
80
70
60
50
40
30
20
Max.
Ave.
Min.
10
1
0
Contact resistance（mΩ）
Tested sample：ALFG2PF091, 6 pcs.
Operation frequency：ON：OFF = 0.1s：10s
Ambient temperature：85℃
Circuit：
0
No. of operations（×104）
3
0
0
No. of operations（×104）
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Power relays (Over 2 A) LF-G RELAYS
2.Coil temperature characteristics
(Average)
3. Ambient temperature characteristics
Tested sample：ALFG2PF091, 6 pcs.
Measured portion：Coil inside
Contact current：33A
Ambient temperature：20℃, 60℃
＊Inside the coil temperature 155℃
（UL Class F）
20℃ 33A
100
60℃ 33A
80
20℃ 0A
60℃ 0A
60
Coil applied voltage（%V）
Allowable ambient temperatures
against % coil voltages
（max. inside the coil
temperature set
as 155℃）
Contact current：33A
140
100
Operate voltage
60
40
20
60
180
80
100
120
Coil applied voltage（%V）
DIMENSIONS
0
140
Coil & contact
0A
0
10
20 30 40 50 60 70 80 90
Ambient temperature（℃）
Unit: mm
CAD The CAD data of the products with a “CAD” mark can be downloaded from our Website.
External dimensions
Recommended PC board pattern
(BOTTOM VIEW)
2dia.
27.6
Schematic
(BOTTOM VIEW)
2dia.
13.8
4
0.5
23.3
CAD
12
Temperature rise（℃）
120
0.8
1.6
22
27.6
0.8
1.6
1.6
0.3
12
1.8dia.
12
10
1.8dia.
Tolerance ±0.1
15.7
30.1
General tolerance
Less than 1mm：±0.1
Min. 1mm less than 3mm：±0.2
Min. 3mm：±0.3
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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)
Standard type
Operations
Ambient
temperature
22 A 277 V AC General use
30 × 103
85°C
22 A 30 V DC Resistive
30 × 103
40°C
File No.
E43028
Contact rating
High capacity type
Contact GAP 1.5 mm
File No.
E43028
Contact rating
Operations
Ambient
temperature
30 × 103
85°C
Operations
Ambient
temperature
30 × 103
85°C
Operations
Ambient
temperature
30 × 103
85°C
Operations
Ambient
temperature
30 × 103
85°C
31 A 277 V AC General use
Contact GAP1.8 mm
File No.
E43028
Contact rating
33 A 277 V AC General use
CSA (Certified)
CSA standard certified by C-UL
VDE (Certified)
Standard type
File No.
40023067
Contact rating
22 A 250 V AC (cosφ = 0.8)
Operations
Ambient
temperature
30 × 103
85°C
High capacity type
Contact GAP 1.5 mm
File No.
40023067
Contact rating
31 A 250 V AC (cosφ = 0.8)
Contact GAP1.8 mm
File No.
40023067
Contact rating
33 A 250 V AC (cosφ = 0.8)
INSULATION CHARACTERISTICS (IEC61810-1)
Item
Characteristics
Clearance/Creepage distance (IEC61810-1)
Min. 5.5/5.5 mm
Category of protection (IEC61810-1)
RT II
Tracking resistance (IEC60112)
PTI 175
Insulation material group
III a
Over voltage category
III
Rated voltage
250 V
Pollution degree
2
Type of insulation (Between contact and coil)
Reinforced insulation
Type of insulation (Between open contacts)
Full disconnection
Note: Actual value
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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)
[Temperature and humidity range for usage, transport, and
storage]
[When rated coil voltage applied]
Humidity（％RH）
85
Note: T he humidity range varies with the temperature. Use within the range
indicated in the graph.
Allowable range
3) Atmospheric pressure
86 to 106 kPa
Avoid icing
when used at
temperatures
lower than 0℃
Avoid condensation when
used at temperatures
higher than 0℃
5
ｰ40
0
60
Ambient temperature（℃）
[When coil holding voltage is 45 to 80% V of rated coil voltage]
Humidity (％ RH)
85
Allowable range
Avoid icing
when used at
temperatures
lower than 0°C
Avoid con
densation when
used at tem
peratures higher
than 0°C
5
40
0
Ambient temperature (℃)
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ASCTB196E 202204
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
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.
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
Humidity (％ RH)
85
Allowable range
Avoid icing
when used at
temperatures
lower than 0°C
Avoid con
densation when
used at tem
peratures higher
than 0°C
5
40
0
Ambient temperature (℃)
85
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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
Panasonic Industry Co., Ltd. 2022
ASCTB412E 202204
Electromechanical Control Business Division
1006, Oaza Kadoma, Kadoma-shi, Osaka 571-8506, Japan
industral.panasonic.com/ac/e/
©Panasonic Industry Co., Ltd. 2022
Specifications are subject to change without notice.
ASCTB196E 202204
2022.4
