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LY

Bi-power Relays

LY

Power-switching Compact General-purpose Relays

Ratings

Standard Models with Built-in Operation Indicators

Operating Coil, Single-pole and Double-pole Models

Item Rated current
(mA)
Coil
resist-
ance
(Ω)
Coil inductance (H) Must-
operate
voltage
(V)
Must-
release
voltage
(V)
Maximum
voltage
(V)
Power
con-
sumption
(VA, W)
Rated
voltage (V)
50 Hz 60Hz Armature
OFF
Armature
ON
AC 12 106.5 91 46 0.17 0.33 80% max.
*1
30% min.
*2
110% of
rated
voltage
Approx. 1.0
to 1.2
(at 60 Hz)
24 53.8 46 180 0.69 1.3
50 25.7 22 788 3.22 5.66
100/110 11.7/12.9 10/11 3,750 14.54 24.6 Approx. 0.9
to 1.1
(at 60 Hz)
110/120 9.9/10.8 8.4/9.2 4,430 19.2 32.1
200/220 6.2/6.8 5.3/5.8 12,950 54.75 94.07
220/240 4.8/5.3 4.2/4.6 18,790 83.5 136.4
DC 6 150 40 0.16 0.33 10% min.
*2
Approx. 0.9
12 75 160 0.73 1.37
24 36.9 650 3.2 5.72
48 18.5 2,600 10.6 21.0
100/110 9.1/10 11,000 45.6 86.2

3 poles

Item Rated current
(mA)
Coil
resist-
ance
(Ω)
Coil inductance (H) Must-
operate
voltage
(V)
Must-
release
voltage
(V)
Maximum
voltage
(V)
Power
con-
sumption
(VA, W)
Rated
voltage (V)
50 Hz 60Hz Armature
OFF
Armature
ON
AC 12 159 134 24 0.12 0.21 80% max.
*1
30% min.
*2
110% of
rated
voltage
Approx.
1.6 to 2.0
(at 60 Hz)
24 80 67 100 0.44 0.79
100/110 14.1/16 12.4/13.7 2,300 10.5 18.5
200/220 9.0/10.0 7.7/8.5 8,650 34.8 59.5
DC 12 112 107 0.45 0.98 10% min.
*2
Approx. 1.4
24 58.6 410 1.89 3.87
48 28.2 1,700 8.53 13.9
100/110 12.7/13 8,500 29.6 54.3

4 poles

Item Rated current
(mA)
Coil
resist-
ance
(Ω)
Coil inductance (H) Must-
operate
voltage
(V)
Must-
release
voltage
(V)
Maximum
voltage
(V)
Power
con-
sumption
(VA, W)
Rated
voltage (V)
50 Hz 60Hz Armature
OFF
Armature
ON
AC 12 199 170 20 0.1 0.17 80% max.
*1
30% min.
*2
110% of
rated
voltage
Approx.
1.95 to 2.5
(at 60 Hz)
24 93.6 80 78 0.38 0.67
100/110 22.5/25.5 19/21.8 1,800 10.5 17.3
200/220 11.5/13.1 9.8/11.2 6,700 33.1 57.9
DC 12 120 100 0.39 0.84 10% min.
*2
Approx. 1.5
24 69 350 1.41 2.91
48 30 1,600 6.39 13.6
100/110 15/15.9 6,900 32.0 63.7

Note: 1. The rated current and coil resistance are measured at a coil temperature of 23°C with tolerances of +15%/
              -20% for the AC rated current and ±15% for the DC coil resistance.
           2. The AC coil resistance and inductance values are reference values only. (at 60 Hz).
           3. Operating characteristics were measured at a coil temperature of 23°C.
           4. The maximum voltage capacity was measured at an ambient temperature of 23°C.
*1. There is variation between products, but actual values are 80% max.
       To ensure operation, apply at least 80% of the rated value (at a coil temperature of +23° C).
*2. The actual values are 30% min. for AC and 10% min. for DC. To ensure release, use a value that is lower than the
       specified value.

Refer to List of Certified Models for a list of models that are certified for safety standards and the Electrical Appliances and Material Safety Act.

Classification 1 pole Double-, 3-, and 4-pole
models
Bifurcated contacts
Load Resistive
load
Inductive load
(cos φ = 0.4,
L/R = 7 ms)
Resistive
load
Inductive load
(cos φ = 0.4,
L/R = 7 ms)
Resistive
load
Inductive load
(cos φ = 0.4,
L/R = 7 ms)
Contact type Single Bifurcated
Contact
materials
Ag alloy Ag
Rated load 15 A at 110 VAC
15 A at 24 VDC
10 A at 110 VAC
7 A at 24 VDC
10 A at 110 VAC
10 A at 24 VDC
7.5 A at 110 VAC
5 A at 24 VDC
5 A at 110 VAC
5 A at 24 VDC
4 A at 110 VAC
4 A at 24 VDC
Rated carry
current
15 A 10 A 7 A
Maximum
contact
voltage
250 VAC
125 VDC
250 VAC
125 VDC
250 VAC
125 VDC
Maximum
contact
current
15 A 15 A 10 A 10 A 7 A 7 A

Type Single-pole and double-pole models
(standard models and bifurcated
contact models)
Single-pole, double-pole models
(models with built-in operation indicators,
models with built-in diodes, and models with
built-in CR circuits),
3-pole and 4-pole models
Ambient operating
temperature
-25 to 55°C
(with no icing or condensation) *1
-25 to +40°C
(with no icing or condensation) *2
Ambient operating
humidity
5% to 85%

Note: 1. Some models in the LY1 and LY2 Series have an upper temperature limit of +40°C. This limitation is due to the
              diode junction temperature and the elements used.
           2. Refer to the ambient temperature and contact carry current characteristics data on Catalog for information on
                operation in temperature conditions that are not described here.
           3. When you apply a minimum of 10 A of current to an LY1 when it is used in combination with a PTF08A,
                PTF08A-E, or PT08, connect each of the following terminal pairs: (1) to (2), (3) to (4), and (5) to (6).
*1. If the carry current is 4 A or less, the usable ambient temperature range is −25 to 70° C.
*2. If the flowing current is 4 A or less, the usable ambient temperature range is -25 to 55° C.

Characteristics

Type Standard models, models with
built-in operation indicators,
models with built-in CR circuits,
and models with built-in diodes
Bifurcated contacts
Contact resistance *1 50 mΩ max.
Operating time *2 25 ms max.
Release time *2 25 ms max.
Maximum
operating
frequency
Mechanical 18,000 operations/h
Rated load 1,800 operations/h
Insulation resistance *3 100 MΩ min.
Dielectric
strength
Between coil and
contacts
2,000 VAC at 50/60 Hz for 1 min.
Between contacts
of different
polarity
Between contacts
of the same
polarity
1,000 VAC at 50/60 Hz for 1 min.
Vibration
resistance
Destruction 10 to 55 to 10 Hz, 0.5-mm single amplitude (1.0-mm double amplitude)
Malfunction 10 to 55 to 10 Hz, 0.5-mm single amplitude (1.0-mm double amplitude)
Shock
resistance
Destruction 1,000 m/s2
Malfunction 200 m/s2
Endurance Mechanical AC: 50,000,000 operations min.
DC: 100,000,000 operations min.
(switching frequency: 18,000 operations/h)
Electrical *4 1-, 3-, 4-pole: 200,000 operations min.
2-pole: 500,000 operations min.
(rated load, operating frequency: 1,800
operations/h)
2-pole: 500,000 operations min.
(rated load, operating frequency: 1,800
operations/h)
Failure rate P value
(reference value) *5
100 mA at 5 VDC 10mA at 5 VDC
Weight 1-pole and 2-pole: 40 g, 3-pole: Approx. 50 g, 4-pole: Approx. 70 g

Note: The values at the left are initial values.
*1. Measurement conditions: 1 A at 5 VDC using the voltage drop method
*2. Measurement conditions: With rated operating power applied, not including contact bounce.
       Ambient temperature condition: 23° C
*3. Measurement conditions: For 500 VDC applied to the same location as for dielectric strength measurement.
*4. Ambient temperature condition: 23° C
*5. This value was measured at a switching frequency of 120 operations per minute.

Endurance Under Real Loads (Reference Only)

Item LY1, 100 VAC LY2, 100 VAC
Load type Conditions Operating
frequency
Electrical life
(×10,000
operations
min.)
Conditions Operating
frequency
Electrical life
(×10,000
operations
min.)
AC motor 400 W, 100 VAC
single-phase with
35-A inrush
current, 7-A
current flow
ON for 10 s,
OFF for 50 s
5 200 W, 100 VAC
single-phase with
25-A inrush
current, 5-A
current flow
ON for 10 s,
OFF for 50 s
20
AC lamp 300 W, 100 VAC
with 51-A inrush
current, 3-A
current flow
ON for 5 s,
OFF for 55 s
10 300 W, 100 VAC
with 51-A inrush
current, 3-A
current flow
ON for 5 s,
OFF for 55 s
8
500 W, 100 VAC
with 78-A inrush
current, 5-A
current flow
2.5
Capacitor
(2,000 μF)
24 VDC with 50-A
inrush current,
1-A current flow
ON for 1 s,
OFF for 6 s
10 24 VDC with 50-A
inrush current,
1-A current flow
ON for 1 s,
OFF for 15 s
1
24 VDC with 20-A
inrush current,
1-A current flow
15
AC solenoid 50 VA with 2.5-A
inrush current,
0.25-A current
flow
ON for 1 s,
OFF for 2 s
150 50 VA with 2.5-A
inrush current,
0.25-A current
flow
ON for 1 s,
OFF for 2 s
100
100 VA with 5-A
inrush current,
0.5-A current flow
80 100 VA with 5-A
inrush current,
0.5-A current flow
50

Item LY4, 100 VAC
Load type Conditions Operating frequency Electrical life
(×10,000 operations min.)
AC motor 200 W, 200 VAC three-phase with 5-A
inrush current, 1-A current flow
ON for 10 s,
OFF for 50 s
50
750 W, 200 VAC three-phase with 18-A
inrush current, 3.5-A current flow
7
AC lamp 300 W, 100 VAC with 51-A inrush current,
3-A current flow
ON for 5 s,
OFF for 55 s
5
Capacitor
(2,000 μF)
24 VDC with 50-A inrush current,
1-A current flow
ON for 1 s,
OFF for 15 s
0.5
24 VDC with 20-A inrush current,
1-A current flow
ON for 1 s,
OFF for 2 s
20
AC solenoid 50 VA with 2.5-A inrush current,
0.25-A current flow
ON for 1 s,
OFF for 2 s
100
100 VA with 5-A inrush current,
0.5-A current flow
50