LF-G (ALFG)
1
ds_61B12_en_lfg: 080711D
ORDERING INFORMATION
Ideal for Solar inverter
Compact size,
1 Form A 22A/31A
Power Relay
LF-G RELAYS (ALFG)
VDE
FEATURES
• High capacity
High capacity control possible at 22A/
31A (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
• Contact gap: 1.5 mm .059 inch
Compliant with European photovoltaic
standard (VDE0126).
EN61810-1 certified: 2.5 kV surge
breakdown voltage (between contacts)
• 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: 20C 68F).
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 85C 185F, make the coil
holding voltage between 45% and
80%V of the nominal coil voltage.
• High insulation resistance
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
• Conforms to various safety
standards
UL, C-UL and VDE approved
TYPICAL APPLICATIONS
• Photovoltaic power generation
systems (Solar inverter)
• Uninterruptible Power Supplies
(UPS)
• Home appliances
• Office equipment
LF-G relay
ALFG P F
Terminal shape
P: PCB type
Nominal coil voltage (DC)
09: 9V, 12: 12V, 18: 18V, 24: 24V
Contact arrangement
1: 1 Form A Standard type (22A)
2: 1 Form A High capacity type (31A)
Coil insulation class
F: UL Class F
Note: UL, C-UL and VDE approved type is standard.
LF-G (ALFG)
2ds_61B12_en_lfg: 080711D
TYPES
Standard packing: Carton: 50 pcs.; Case: 200 pcs.
RATING
Coil data
Specifications
Notes: *1This 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.
*2Wave is standard shock voltage of 1.250s according to JEC-212-1981
*3In accordance with UL class-F
*4Coil holding voltage is the coil voltage after 100 ms from the applied nominal coil voltage.
*5The upper limit of the ambient temperature is the maximum temperature that can satisfy the coil temperature rise value. Refer to 1. Usage, transport and storage
conditions in NOTES.
Contact arrangement Nominal coil voltage Part No.
Standard type High capacity type
1 Form A
9V DC ALFG1PF09 ALFG2PF09
12V DC ALFG1PF12 ALFG2PF12
18V DC ALFG1PF18 ALFG2PF18
24V DC ALFG1PF24 ALFG2PF24
Nominal coil
voltage
Pick-up voltage
(at 20C 68F)
(Initial)
Drop-out voltage
(at 20C 68F)
(Initial)
Nominal operating
current
[10%] (at 20C 68F)
Coil resistance
[10%] (at 20C 68F)Nominal operating
power Max. allowable voltage
(at 20C 68F)
9V DC 70%V or less of
nominal voltage 10%V or more of
nominal voltage
115mA 58
1,400mW 120%V of
nominal voltage
12V DC 117mA 103
18V DC 78mA 230
24V DC 59mA 410
Characteristics Item Specifications
Standard type High capacity type
Contact Arrangement 1 Form A
Contact resistance (Initial) Max. 100 m (By voltage drop 6 V DC 1A)
Contact material AgSnO2 type
Rating
Nominal switching capacity 22A 250V AC 31A 250V AC
Max. switching power 5,500VA 7,750VA
Max. switching voltage 250V AC
Max. switching current 22A (AC) 31A (AC)
Nominal operating power 1,400mW
Min. switching capacity (Reference value)*1100mA 5V DC
Electrical
characteristics
Insulation resistance (Initial) Min. 1,000M (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) 6,000 V (initial)
Temperature rise*3
Max. 95C 203F (By resistive method, nominal
coil voltage applied to the coil; contact carrying
current: 22A, at 60C 140F)
Max. 70C 158F (By resistive method, 80%V
of nominal coil voltage applied to the coil;
contact carrying current: 22A, at 85C 185F)
Max. 95C 203F (By resistive method, nominal
coil voltage applied to the coil; contact carrying
current: 31A, at 60C 140F)
Max. 70C 158F (By resistive method, 80%V
of nominal coil voltage applied to the coil;
contact carrying current: 31A, at 85C 185F)
Coil holding voltage*4
35 to 120%V (contact carrying current: 22A,
at 20C 68F)
45 to 80%V (contact carrying current: 22A,
at 85C 185F)
35 to 120%V (contact carrying current: 31A,
at 20C 68F)
45 to 80%V (contact carrying current: 31A,
at 85C 185F)
Operate time (at 20C 68F) Max. 20 ms (at nominal coil voltage excluding contact bounce time.)
Release time (at 20C 68F) 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: 10s.)
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: 10s.)
Destructive 10 to 55 Hz at double amplitude of 1.5 mm
Expected life
Mechanical Min. 106 (at 180 cpm)
Electrical
Resistive load 22A 250V AC, Min. 3104 (at 20 cpm) —
Inductive load
22A 250V AC (cos = 0.8),
Min. 3104 (on:off = 0.1s:10s)
Over load: 35A 250V AC (cos = 0.8),
Min. 50 (on:off = 0.1s:10s)
31A 250V AC (cos = 0.8),
Min. 3104 (on:off = 0.1s:10s)
Over load: 47A 250V AC (cos = 0.8),
Min. 50 (on:off = 0.1s:10s)
Conditions Conditions for operation, transport and storage*5
Ambient temperature: –40C to +60C –40F to +140F (When nominal coil voltage applied)
–40C to +85C –40F to +185F (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)
3
ds_61B12_en_lfg: 080711D
REFERENCE DATA
Standard type
1-1. DC load limit curve
Switching Voltage (VDC)
10 20 30 40 60 100 200 300 500 700 1000
Switching Current (A)
0.2
0.3
0.5
1
2
3
5
10
20
30
60
100
resistive DC- load
1-2. Coil temperature rise
Sample: ALFG1PF09, 6 pcs.
Point measured: coil inside
Ambient temperature: 20C 68F, 60C 140F
Contact carrying current: 22A
2. Ambient temperature characteristics and coil
applied voltage
Coil applied voltage, %V
20°C
60°C140°F22A
60°C140°F0A
68°F22A
20°C68°F0A
1401201008060
100
80
60
40
20
Temperature rise, °C
Coil applied voltage, %V
900 1020304050607080
180
140
100
60
0
Ambient temperature, °C
Contact carrying
current: 22A
Pick-up voltage
Coil & contact
no carrying current
*Inside the coil temperature
155°C311°F(UL Class F)
Allowable ambient temperatures
against % coil voltages
(max. inside the coil temperature
set as 155°C311°F)
3. Electrical life test
(22A 250V AC Resistive load)
Sample: ALFG1PF09, 6 pcs.
Operation frequency: ON:OFF = 1.5s:1.5s
Ambient temperature: 85C 185F
Circuit:
Change of pick-up and drop-out voltage Change of contact resistance
Contact welding detection
and Mis-contacting
detection circuit
250V AC
9V DC
Pick-up and drop-out voltage, V
30
10
9
8
7
6
5
4
3
2
1
0
Max.
Min.
x
Max.
Min.
x
No. of operations, ×104
Pick-up voltage
Drop-out voltage
Contact resistance, mΩ
No. of operations, ×104
30
100
90
80
70
60
50
40
30
20
10
0
Max.
Min.
x
4. Electrical life test
(22A 250V AC cos = 0.8 Inductive load)
Sample: ALFG1PF09, 6 pcs.
Operation frequency: ON:OFF = 0.1s:10s
Ambient temperature: 85C 185F
Circuit:
Change of pick-up and drop-out voltage Change of contact resistance
Contact welding detection
and Mis-contacting
detection circuit
250V AC
9V DC
Pick-up and drop-out voltage, V
30
10
9
8
7
6
5
4
3
2
1
0
Max.
Min.
x
Max.
Min.
x
No. of operations, ×104
Pick-up voltage
Drop-out voltage
Contact resistance, mΩ
No. of operations, ×104
30
100
90
80
70
60
50
40
30
20
10
0
Max.
Min.
x
LF-G (ALFG)
4ds_61B12_en_lfg: 080711D
High capacity type
DIMENSIONS(mm inch)
SAFETY STANDARDS
Certification authority Standard type High capacity type
UL, C-UL 22A 277V AC General Use (at 85C 185F) 31A 277V AC General Use (at 85C 185F)
VDE (VDE0435) 22A 250V AC cos = 0.8 (at 85C 185F) 31A 250V AC cos = 0.8 (at 85C 185F)
1. Coil temperature rise
Sample: ALFG2PF09, 6 pcs.
Point measured: coil inside
Ambient temperature: 20C 68F, 60C 140F
Contact carrying current: 31A
2. Ambient temperature characteristics and coil
applied voltage
Coil applied voltage, %V
20°C
60°C140°F31A
60°C140°F0A
68°F31A
20°C68°F0A
1401201008060
100
80
60
40
20
Temperature rise, °C
Coil applied voltage, %V
900 1020304050607080
180
140
100
60
0
Ambient temperature, °C
Contact carrying
current: 31A
Pick-up voltage
Coil & contact
no carrying current
*Inside the coil temperature
155°C311°F(UL Class F)
Allowable ambient temperatures
against % coil voltages
(max. inside the coil temperature
set as 155°C311°F)
3. Electrical life test
(31A 250V AC cos = 0.8 Inductive load)
Sample: ALFG2PF09, 6 pcs.
Operation frequency: ON:OFF = 0.1s:10s
Ambient temperature: 85C 185F
Circuit:
Change of pick-up and drop-out voltage Change of contact resistance
Contact welding detection
and Mis-contacting
detection circuit
250V AC
9V DC
Pick-up and drop-out voltage, V
30
10
9
8
7
6
5
4
3
2
1
0
Max.
Min.
x
Max.
Min.
x
No. of operations, ×104
Pick-up voltage
Drop-out voltage
Contact resistance, mΩ
No. of operations, ×104
30
100
90
80
70
60
50
40
30
20
10
0
Max.
Min.
x
Download from our Web site.
CAD Data
CAD Data
CAD Data External dimensions
23.3
.917
4.0
.157
0.5
.020
15.7
.618
12.0
.472
22.0
.866
27.6
1.087
30.1
1.185
Dimension: General tolerance
Max. 1mm .039 inch:0.1 .004
1 to 3mm .039 to .118 inch:0.2 .008
Min. 3mm .118 inch:0.3 .012
PC board pattern (Bottom view)
Tolerance: 0.1 .004
Schematic (Bottom view)
10.0±0.1
.394±.004
27.6±0.1
1.087±.004
12.0±0.1
.472±.004
13.8±0.1
.543±.004
12.0±0.1
.472±.004
1.8 dia.
.071 dia.
1.8 dia.
.071 dia.
2.0 dia.
.079 dia.
2.0 dia.
.079 dia.
NO COM
LF-G (ALFG)
5
ds_61B12_en_lfg: 080711D
NOTES
Usage, transport and storage
conditions
1) Temperature:
–40 to +60C –40 to +140F (When
nominal coil voltage applied)
–40 to +85C –40 to +185F (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
–40 to +85C –40 to +185F (When 45% to
80%V of coil holding voltage)
4) Condensation
Condensation forms when there is a
sudden change in temperature under
high temperature and high humidity
conditions. Condensation will cause
deterioration of the relay insulation.
5) Freezing
Condensation or other moisture may
freeze on the relay when the
temperatures is lower than 0C 32F.
This causes problems such as sticking of
movable parts or operational time lags.
6) Low temperature, low humidity
environments
The plastic becomes brittle if the relay is
exposed to a low temperature, low
humidity environment for long periods of
time.
Solder and cleaning conditions
1) Please obey the following conditions
when soldering automatically.
(1) Preheating: Within 120C 248F
(solder surface terminal portion) and
within 120 seconds
(2) Soldering iron: 260C5C
500F41F (solder temperature) and
within 6 seconds (soldering time)
2) Since this is not a sealed type relay, do
not clean it as is. Also, be careful not to
allow flux to overflow above the PC board
or enter the inside of the relay.
Certification
1) This relay is UL, C-UL certified.
UL, C-UL;
Standard type:
22A 277V AC General Use
High capacity type:
31A 277V AC General Use
2) This relay is certified by VDE
(VDE0435).
VDE;
Standard type:
22A 250V AC cos = 0.8
High capacity type:
31A 250V AC cos = 0.8
Cautions for use
1) For precautions regarding use and
explanations of technical terminology,
please refer to our web site.
(panasonic-electric-works.net/ac)
2) To ensure good operation, please
keep the voltage on the coil ends to 5%
(at 20C 68F) of the rated coil operation
voltage. Also, please be aware that the
pick-up voltage and drop-out voltage may
change depending on the temperature
and conditions of use.
3) Keep the ripple rate of the nominal coil
voltage below 5%.
4) Please test with actual device when
using the coil holding voltage with PWM
control.
5) The cycle lifetime is defined under the
standard test condition specified in the
JIS C5442 standard (temperature 15 to
35C 59 to 95F, humidity 25 to 75%).
Check this with the real device as it is
affected by coil driving circuit, load type,
activation frequency, activation phase,
ambient conditions and other factors.
Also, be especially careful of loads such
as those listed below.
(1) When used for AC load-operating and
the operating phase is synchronous.
Rocking and fusing can easily occur due
to contact shifting.
(2) Highly frequent load-operating
When highly frequent opening and
closing of the relay is performed with a
load that causes arcs at the contacts,
nitrogen and oxygen in the air is fused by
the arc energy and HNO3 is formed. This
can corrode metal materials.
Three countermeasures for these are
listed here.
• Incorporate an arc-extinguishing circuit.
• Lower the operating frequency
• Lower the ambient humidity
6) 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.
7) Heat, smoke, and even a fire may
occur if the relay is used in conditions
outside of the allowable ranges for the
coil ratings, contact ratings, operating
cycle lifetime, and other specifications.
Therefore, do not use the relay if these
ratings are exceeded.
8) If the relay has been dropped, the
appearance and characteristics should
always be checked before use.
9) Incorrect wiring may cause
unexpected events or the generation of
heat or flames.
10) If complying with the Electrical
Appliance and Material Safety Law (300V
AC), please use with a nominal current
no higher than 10A.
11) In order to reduce the occurrence of
solder cracking due to thermal stress on
the PC board, please use a double-face
through hole PC board.
85
5
060- 40
Humidity, %RH
Tolerance range
+32 +140- 40
Temperature, °C°F
(Avoid freezing
when used at
temperatures lower
than 0°C
(Avoid
condensation
when used at
temperatures
higher than
0°C32°F)
32°F)
85
5
Humidity, %RH
Tolerance range
(Avoid
condensation
when used at
temperatures
higher than
0°C32°F)
(Avoid freezing
when used at
temperatures
lower than
0°C32°F)
850-40 +185+32-40
Temperature, °C°F
