© Panasonic Corporation 2019
1
industrial.panasonic.com/ac/e/ ASCTB196E 201903
2019.03
ORDERING INFORMATION
TYPICAL APPLICATIONS
LF-G RELAYS
(ALFG)
Load for solar inverter,
Compact size,
1 Form A 22A/33A
power relays
1. Photovoltaic power generation
systems (Solar inverter)
2. Uninterruptible Power Supplies
(UPS)
3. Home appliances
4. Oce equipment
23.323.3
30.1
30.115.7
15.7
（
Unit
：
mm
）
Protective construction
：
Flux-resistant type
Standard packing: Carton: 50 pcs.; Case: 200 pcs.
TYPES
FEATURES
1. High capacity
High capacity control possible at 22A/
33A (High capacity type) 250V AC rating
in compact size (L: 15.7 × W: 30.1 ×
H: 23.3 mm L: .618 × W: 1.185 × H: .917
inch)
2. Contact gap: 1.5 mm .059 inch and
1.8 mm*** .071 inch
Compliant with European photovoltaic
standard (IEC62109* and VDE0126**).
* Safety standard of PV power inverter
**German safety standard of PV power inverter
***Due to addition of altitude stipulation (2,000 m
6,561.68 ft or more) to IEC62109.
EN61810-1 certied: 2.5 kV surge
breakdown voltage (between contacts)
3. Long insulation distance
Creepage distance between contact and
coil terminal: Min. 9.5 mm .354 inch
Clearance distance between contact and
coil terminal: Min. 6.5 mm .256 inch
Surge breakdown voltage: 6 kV
4. Coil holding voltage contributes to
saving energy of equipment
The coil holding voltage can be reduced
up to 35%V of the nominal coil voltage
(Ambient temperature: 20°C 68°F).
Power consumption at the lowest coil
holding voltage: 170 mW equivalent
*Coil holding voltage is the coil voltage
after 100 ms from the applied nominal
coil voltage.
*When the ambient temperature during
use is 85°C 185°F, make the coil holding
voltage between 45% and 80%V of the
nominal coil voltage.
5. Conforms to various safety
standards
UL/C-UL and VDE approved
ALFG P F
Contact arrangement
1:1 Form A Standard type
2:1 Form A High capacity type
Terminal shape
P：PCB type
Coil insulation class
F：UL Class F
Nominal 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
Contact
arrangement
Nominal coil
voltage
Part No.
Contact Gap 1.5 mm .059 inch type Contact Gap 1.8 mm .071 inch type
Standard type High capacity type Standard type High capacity type
1 Form A
9V DC ALFG1PF09 ALFG2PF09 ALFG1PF091 ALFG2PF091
12V DC ALFG1PF12 ALFG2PF12 ALFG1PF121 ALFG2PF121
18V DC ALFG1PF18 ALFG2PF18 ALFG1PF181 ALFG2PF181
24V DC ALFG1PF24 ALFG2PF24 ALFG1PF241 ALFG2PF241
Automation Controls Catalog
LF-G (ALFG)
Panasonic Corporation Electromechanical Control Business Division
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© Panasonic Corporation 2019 ASCTB196E 201903
RATING
1.Coil data
• Operating characteristics such as ‘Operate voltage’ and ‘Release voltage’ are inuenced 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.
2. Specications
Notes: *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 ±1.2×50μs according to JEC-212-1981
*3. Coil holding voltage is the coil voltage after 100 ms from the applied nominal coil voltage.
*4. The upper limit of the ambient temperature is the maximum temperature that can satisfy the coil temperature rise value. Refer to Usage, transport and storage
conditions in NOTES.
Nominal coil
voltage
Pick-up voltage
(at 20°C 68°F)
(Initial)
Drop-out voltage
(at 20°C 68°F)
(Initial)
Nominal operating
current
[±10%] (at 20°C 68°F)
Coil resistance
[±10%] (at 20°C 68°F)
Nominal operating
power
Max. applied voltage
(at 20°C 68°F)
9V DC
70%V or less of
nominal voltage
10%V or more of
nominal voltage
155mA 58Ω
1,400mW 120%V of
nominal voltage
12V DC 117mA 103Ω
18V DC 78mA 230Ω
24V DC 59mA 410Ω
Characteristics Item
Specications
Standard type High capacity type
Contact Gap 1.5 mm .059 inch type
Contact Gap 1.8 mm .071 inch type Contact Gap 1.5 mm .059 inch type Contact Gap 1.8 mm .071 inch type
Contact
Arrangement 1 Form A
Contact resistance (Initial) Max. 100 mΩ (By voltage drop 6 V DC 1A)
Contact material AgSnO2 type
Rating
Nominal switching capacity 22A 250V AC 31A 250V AC 33A 250V AC
Max. switching power 5,500VA 7,750VA 8,250VA
Max. switching voltage 250V AC
Max. switching current 22A (AC) 31A (AC) 33A (AC)
Nominal operating power 1,400mW
Min. switching capacity
(Reference value)*1100mA 5V DC
Electrical
characteristics
Insulation resistance (Initial) Min. 1,000MΩ (at 500V DC) Measurement at same location as “Breakdown voltage” section.
Breakdown
voltage (Initial)
Between open
contacts 2,500 Vrms for 1 min. (Detection current: 10 mA)
Between contact
and coil 4,000 Vrms for 1 min. (Detection current: 10 mA)
Surge breakdown voltage*2
(Between contact and coil) (Initial) 6,000 V
Coil holding voltage*3
35 to 120%V (contact carrying
current: 22A, at 20°C 68°F)
45 to 80%V (contact carrying
current: 22A, at 85°C 185°F)
35 to 120%V (contact carrying
current: 31A, at 20°C 68°F)
45 to 80%V (contact carrying
current: 31A, at 85°C 185°F)
35 to 120%V (contact carrying
current: 33A, at 20°C 68°F)
45 to 80%V (contact carrying
current: 33A, at 85°C 185°F)
Operate time (at 20°C 68°F) (Initial) Max. 20 ms (at nominal coil voltage excluding contact bounce time.)
Release time (at 20°C 68°F) (Initial) Max. 10 ms (at nominal coil voltage excluding contact bounce time, without diode)
Mechanical
characteristics
Shock
resistance
Functional Min. 100 m/s2 (Half-wave pulse of sine wave: 11 ms; detection time: 10µs.)
Destructive Min. 1,000 m/s2 (Half-wave pulse of sine wave: 6 ms.)
Vibration
resistance
Functional 10 to 55 Hz at double amplitude of 1.5 mm (Detection time: 10µs.)
Destructive 10 to 55 Hz at double amplitude of 1.5 mm
Expected life
Mechanical Contact Gap 1.5 mm .059 inch type: Min. 106 (at 180 times/min.)
Contact Gap 1.8 mm .071 inch type: Min. 5×105 (at 180 times/min.)
Electrical
Resistive load 22A 250V AC, Min. 3×104
(at 20 times/min.) — —
Inductive load
Destructive: 22A 250V AC
(cosφ = 0.8),
Min. 3×104 (on:o = 0.1s:10s)
Over load: 35A 250V AC
(cosφ = 0.8),
Min. 50 (on:o = 0.1s:10s)
Destructive: 31A 250V AC
(cosφ = 0.8),
Min. 3×104 (on:o = 0.1s:10s)
Over load: 47A 250V AC
(cosφ = 0.8),
Min. 50 (on:o = 0.1s:10s)
Destructive: 33A 250V AC
(cosφ = 0.8),
Min. 3×104 (on:o = 0.1s:10s)
Over load: 50A 250V AC
(cosφ = 0.8),
Min. 50 (on:o = 0.1s:10s)
Conditions Conditions for operation, transport
and storage*4
Ambient temperature: –40°C to +60°C –40°F to +140°F (When nominal coil voltage applied)
–40°C to +85°C –40°F to +185°F (Coil holding voltage is when 45 to 80%V
of nominal coil voltage is applied.)
Humidity: 5 to 85% R.H. (Not freezing and condensing at low temperature)
Air pressure: 86 to 106 kPa
Unit weight Approx. 23 g .81 oz
LF-G (ALFG)
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REFERENCE DATA
1. Standard type (Contact Gap 1.5 mm .059 inch type) (Contact Gap 1.8 mm .071 inch type)
3. Electrical life test
(22A 250V AC Resistive load)
1. Coil temperature rise
9V DC
250V AC
Contact
welding detection
and Mis-contacting
detection circuit
0
0
2
3
1
4
6
5
8
7
9
10
3
Max.
Min.
Ave.
Max.
Min.
Ave. Max.
Min.
Ave.
0
0
20
30
10
40
60
50
80
70
90
100
3
Release voltage
Release voltage
Operate voltage
Operate voltage
Operate and release voltage
（V）
No. of operations
（×104）
Change of operate and release voltage
Contact resistance
（mΩ）
No. of operations
（×104）
Change of contact resistance
Tested sample：ALFG1PF09, ALFG1PF091, 6 pcs.
Operation frequency：ON：OFF = 1.5s：1.5s
Ambient temperature：85°
C
Circuit：
4. Electrical life test
(22A 250V AC cosφ = 0.8 Inductive load)
9V DC
250V AC
Contact
welding detection
and Mis-contacting
detection circuit
0
0
2
3
1
4
6
5
8
7
9
10
3
Max.
Min.
Ave.
Max.
Min.
Ave.
Max.
Min.
Ave.
0
0
20
30
10
40
60
50
80
70
90
100
3
Tested sample：ALFG1PF09, ALFG1PF091, 6 pcs.
Operation frequency：ON：OFF = 0.1s：10s
Ambient temperature：85°
C
Circuit：
Release voltageRelease voltage
Operate voltage
Operate voltage
Operate and release voltage
（V）
No. of operations
（×104）
Change of operate and release voltage
Contact resistance
（mΩ）
No. of operations
（×104）
Change of contact resistance
2. Ambient temperature characteristics and coil
applied voltage
20℃ 22A 20℃ 22A
60℃ 22A 60℃ 22A
20℃ 0A 20℃ 0A
60℃ 0A 60℃ 0A
60 80 100 120 140
100
80
60
40
20
Tested sample：ALFG1PF09, ALFG1PF091, 6 pcs.
Measured portion：Coil inside
Contact current：22A
Ambient temperature：20℃, 60℃
Temperature rise
（℃）
Coil applied voltage
（%V）
Coil & contact
0A
Coil & contact
0A
0 10 20 30 40 50 60 70 80 90
＊
Inside the coil temperature 155℃（UL Class F）＊
Inside the coil temperature 155℃（UL Class F）
180
0
140
100
60
Coil applied voltage
（%V）
Ambient temperature
（℃）
Operate voltageOperate voltage
Contact current：22A
Contact current：22A
Allowable ambient temperatures
against % coil voltages
（max. inside the coil
temperature set
as 155℃）
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© Panasonic Corporation 2019 ASCTB196E 201903
2. High capacity type (Contact Gap 1.5 mm .059 inch type)
3. Electrical life test
(31A 250V AC cosφ = 0.8 Inductive load)
1. Coil temperature rise
9V DC
250V AC
Contact
welding detection
and Mis-contacting
detection circuit
Max.
Min.
Ave.
Max.
Min.
Ave.
0
0
2
3
1
4
6
5
8
7
9
10
3
Max.
Min.
Ave.
0
0
20
30
10
40
60
50
80
70
90
100
3
Release voltage
Release voltage
Operate voltage
Operate voltage
Operate and release voltage
（V）
No. of operations
（×
10
4）
Change of operate and release voltage
Contact resistance
（mΩ）
No. of operations
（×
10
4）
Change of contact resistance
Tested sample
：
ALFG2PF09, 6 pcs.
Operation frequency：ON：OFF = 0.1s：10s
Ambient temperature：85℃
Circuit：
3. Electrical life test
(33A 250V AC cosφ = 0.8 Inductive load)
9V DC
250V AC
Contact
welding detection
and Mis-contacting
detection circuit
Max.
Min.
Ave.
Max.
Min.
Ave.
Release voltage
Release voltage
Operate voltage
Operate voltage
Operate and release voltage
（V）
No. of operations
（×104）
Change of operate and release voltage
Contact resistance
（mΩ）
No. of operations
（×104）
Change of contact resistance
Tested sample：ALFG2PF091, 6 pcs.
Operation frequency：ON：OFF = 0.1s：10s
Ambient temperature：85℃
Circuit：
0
0
2
3
1
4
6
5
8
7
9
10
3
Max.
Min.
Ave.
0
20
30
10
0
40
60
50
80
70
90
100
3
2. Ambient temperature characteristics and coil
applied voltage
3. High capacity type (Contact Gap 1.8 mm .071 inch type)
120
20℃ 33A
60℃ 33A
20℃ 0A
60℃ 0A
60 80 100 120 140
100
80
60
40
20
Tested sample：ALFG2PF091, 6 pcs.
Measured portion：Coil inside
Contact current：33A
Ambient temperature：20℃, 60℃
Temperature rise
（℃）
Coil applied voltage
（%V）
0 10 20 30 40 50 60 70 80 90
180
0
140
100
60 Coil & contact
0A
Coil & contact
0A
＊
Inside the coil temperature 155℃（UL Class F）＊
Inside the coil temperature 155℃（UL Class F）
Operate voltageOperate voltage
Contact current：33A
Contact current：33A
Coil applied voltage
（%V）
Ambient temperature
（℃）
Allowable ambient temperatures
against % coil voltages
（max. inside the coil
temperature set
as 155℃）
1. Coil temperature rise 2. Ambient temperature characteristics and coil
applied voltage
60 80 100 120 140
100
80
60
40
20
20℃ 31A
60℃ 31A
20℃ 0A
60℃ 0A
Tested
ｓ
ample
：
ALFG2PF09, 6 pcs.
Measured portion：Coil inside
Contact current：31A
Ambient temperature：20℃, 60℃
Temperature rise
（℃）
Coil applied voltage
（%V）
0 10 20 30 40 50 60 70 80 90
180
0
140
100
60
Coil applied voltage
（%V）
Ambient temperature
（℃）
Coil & contact
0A
Coil & contact
0A
＊
Inside the coil temperature 155℃（UL Class F）＊
Inside the coil temperature 155℃（UL Class F）
Operate voltageOperate voltage
Contact current：31A
Contact current：31A
Allowable ambient temperatures
against % coil voltages
（max. inside the coil
temperature set
as 155℃）
LF-G (ALFG)
5
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DIMENSIONS (mm)
External dimensions
SAFETY STANDARDS
PC board pattern (Bottom view)
Schematic (Bottom view)
0.5
23.34
0.31.6
General tolerance
Less than 1mm：±0.1
Min. 1mm less than 3mm：±0.2
Min. 3mm：±0.3
0.80.8
121.6
1.6
22
27.6
15.7
30.1
Tolerance ±0.1
1012
12
27.6
13.8
2dia. 2dia.
1.8dia. 1.8dia.
Item UL/C-UL (Recognized) VDE (VDE0435) (Certied)
File No. Contact rating Temp. Cycles File No. Contact rating Temp. Cycles
Standard type
(Contact GAP 1.5 mm/1.8 mm
.059 inch/.071 inch)
E43028 22A 277V AC General Use 85°C 185°F 3 × 10440023067 22A 250V AC (cosφ=0.8) 85°C 185°F 3 × 104
22A 277V AC Resistive 85°C 185°F 3 × 104— — — —
22A 30V DC Resistive 40°C 104°F 3 × 104— — — —
High capacity
type
1.5 mm .059 inch E43028 31A 277V AC General Use 85°C 185°F 3 × 10440023067 31A 250V AC (cosφ=0.8) 85°C 185°F 3 × 104
1.8 mm .071 inch E43028 33A 277V AC General Use
33A 30V DC Resistive
85°C 185°F
40°C 104°F
3 × 104
3 × 104
40023067 33A 250V AC (cosφ=0.8) 85°C 185°F 3 × 104
EN/IEC VDE Certied
INSULATION CHARACTERISTIC (IEC61810-1)
Item Characteristic
Clearance/Creepage distance (IEC61810-1) Min. 5.5mm/5.5mm
Category of protection (IEC61810-1) RT II
Tracking resistance (IEC60112) PTI 175
Insulation material group III a
Over voltage category III
Rated voltage 250V
Pollution degree 2
Type of insulation (Between contact and coil) Reinforced insulation
Type of insulation (Between open contacts) Full disconnection
CAD
CAD The CAD data of the products with a “CAD” mark can be downloaded from our Website.
LF-G (ALFG)
Panasonic Corporation Electromechanical Control Business Division
industrial.panasonic.com/ac/e/
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© Panasonic Corporation 2019 ASCTB196E 201903
NOTES
Please refer to "the latest product specications"
when designing your product.
• Requests to customers :
https://industrial.panasonic.com/ac/e/salespolicies/
1. For cautions for use, please read
“GENERAL APPLICATION
GUIDELINES”.
2. Usage, transport and storage
conditions
1) Temperature:
–40 to +60°C –40 to +140°F (When
nominal coil voltage applied)
–40 to +85°C –40 to +185°F (When coil
holding voltage is 45% to 80% of the
nominal coil voltage)
2) Humidity: 5 to 85% RH
(Avoid freezing and condensation.)
The humidity range varies with the
temperature. Use within the range
indicated in the graph below.
3) Atmospheric pressure: 86 to 106 kPa
Temperature and humidity range for
usage, transport, and storage
5
85
0 60
ｰ40
Humidity
（％RH）
Avoid icing
when used at
temperatures
lower than 0℃
Avoid con-
densation when
used at tem-
peratures
higher
than 0℃
Allowable range
Ambient temperature
（℃）
* –40 to +85°C –40 to +185°F (When 45% to
80%V of coil holding voltage)
Panasonic Corporation 2019
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Humidity, %R.H.
Allowable range
85
5
0 85–40
(Avoid
condensation
when used at
temperatures
higher than
0°C
(Avoid icing
when used at
temperatures
lower than 0°C)
Ambient temperature, °C
)
GUIDELINES FOR POWER RELAYS AND HIGH-CAPACITY DC CUT OFF RELAYS USAGE
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 aected 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 diers for
each relays, please refer to the relay's individual specications.
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, re and so on, and circuit do not work. Avoid
impressing voltages to the set coil and reset coil at the same time.
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 dier from the
allowable range. In this case be sure to check the individual
specications. Also allowable humidity level is inuenced by
temperature, please check charts shown below and use relays
within mentioned conditions. (Allowable temperature values
dier for each relays, please refer to the relay's individual
specications.)
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
(Hot start)
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 pick-up 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 pick-up voltage and the pick-up voltage rises in
accordance with the increase in the resistance value. However, for
some polarized relays, this rate of change is considerably smaller.
Precautions for Coil Input
Ambient Environment
For cautions for use, please read “GUIDELINES FOR RELAY USAGE”.
https://industrial.panasonic.com/ac/e/control/relay/cautions_use/index.jsp
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
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 Corporation 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 Corporation 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 sulde gases may cause a sulde lm or oxide lm 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.
ASCTB412E 201903
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c
-2-
GUIDELINES FOR POWER RELAYS AND HIGH-CAPACITY DC CUT OFF RELAYS USAGE
Package
In terms of the packing format used, make every eort to keep the
eects of moisture, organic gases and sulde gases to the absolute
minimum.
Silicon
When a source of silicone substances (silicone rubber, silicone oil,
silicone coating materials and silicone lling 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).
Others
Cleaning
1) 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.
2) 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 specications"
when designing your product.
•Requests to customers:
https://industrial.panasonic.com/ac/e/salespolicies/
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 aects 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.
ASCTB412E 201903
2019
ASCTB196E-1 201903
