LY
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
Inductive load
Bifurcated contacts
Inductive load
(cos φ = 0.4, L/R = 7 ms)
Single
Ag alloy
Inductive load
(cos φ = 0.4, L/R = 7 ms)
Bifurcated
Item
Load
Resistive load
Resistive load
Resistive load
(cos φ = 0.4, L/R = 7 ms)
Contact type
Contact materials
Ag
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 load
Rated carry current
15 A
10 A
7 A
250 VAC
125 VDC
250 VAC
125 VDC
250 VAC
125 VDC
Maximum contact voltage
Maximum contact current
15 A
15 A
10 A
10 A
7 A
7 A
Type
Single-pole, double-pole models
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 page 5 to 7 for
Single-pole and double-pole models
(standard models and bifurcated contact
models)
(models with built-in operation indicators, models
with built-in diodes, and models with built-in CR
circuits),
Item
3-pole and 4-pole models
information on operation in temperature conditions that
are not described here.
Ambient operating
temperature
Ambient operating
humidity
−25 to 55°C
−25 to +40°C
(with no icing or condensation)*1
(with no icing or condensation)*2
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).
5% to 85%
*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
Item
Bifurcated contacts
Contact resistance*1
Operating time*2
Release time*2
50 mΩ max.
25 ms max.
Note: The values at the left are initial values.
*1. Measurement conditions: 1 A at 5 VDC using the voltage
drop method
25 ms max.
*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.
Maximum
operating
frequency
Mechanical
18,000 operations/h
Rated load
1,800 operations/h
Insulation resistance*3
100 MΩ min.
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
Dielectric
strength
1,000 VAC at 50/60 Hz for 1 min.
Destruction
Malfunction
Destruction
Malfunction
10 to 55 to 10 Hz, 0.5-mm single amplitude (1.0-mm double amplitude)
Vibration
resistance
10 to 55 to 10 Hz, 0.5-mm single amplitude (1.0-mm double amplitude)
1,000 m/s2
200 m/s2
Shock
resistance
AC: 50,000,000 operations min.
DC: 100,000,000 operations min.
(switching frequency: 18,000
operations/h)
Mechanical
1-, 3-, 4-pole: 200,000 operations min.
2-pole: 500,000 operations min.
(rated load, operating frequency: 1,800
operations/h)
Endurance
2-pole: 500,000 operations min.
(rated load, operating frequency: 1,800
operations/h)
Electrical*4
Failure rate P value (reference value)*5
Weight
100 mA at 5 VDC
10mA at 5 VDC
1-pole and 2-pole: 40 g, 3-pole: Approx. 50 g, 4-pole: Approx. 70 g
Endurance Under Real Loads (Reference Only)
Item
LY1, 100 VAC
LY2, 100 VAC
LY4, 100 VAC
Load
type
Electrical life
(×10,000
operations min.)
Electrical life
(×10,000
operations min.)
Electrical life
(×10,000
operations min.)
Operating
frequency
Operating
frequency
Operating
frequency
Conditions
Conditions
Conditions
200 W, 200 VAC three-
phase with 5-A inrush
current, 1-A current
flow
50
7
400 W, 100 VAC single-
phase with 35-A inrush ON for 10 s,
current, 7-A current
flow
200 W, 100 VAC single-
phase with 25-A inrush ON for 10 s,
current, 5-A current
flow
ON for 10 s,
OFF for 50 s
AC motor
AC lamp
5
20
OFF for 50 s
OFF for 50 s
750 W, 200 VAC three-
phase with 18-A inrush
current, 3.5-A current
flow
300 W, 100 VAC with
51-A inrush current, 3-
A current flow
10
300 W, 100 VAC with
51-A inrush current, 3-
A current flow
300 W, 100 VAC with
51-A inrush current, 3-
A current flow
ON for 5 s,
OFF for 55 s
ON for 5 s,
OFF for 55 s
ON for 5 s,
OFF for 55 s
8
5
500 W, 100 VAC with
78-A inrush current, 5-
A current flow
2.5
24 VDC with 50-A
inrush current, 1-A
current flow
24 VDC with 50-A
inrush current, 1-A
current flow
ON for 1 s,
1
0.5
20
OFF for 15 s
24 VDC with 50-A
inrush current, 1-A
current flow
Capacitor
(2,000 µF)
ON for 1 s,
OFF for 6 s
ON for 1 s,
OFF for 15 s
10
24 VDC with 20-A
inrush current, 1-A
current flow
24 VDC with 20-A
inrush current, 1-A
current flow
ON for 1 s,
OFF for 2 s
15
50 VA with 2.5-A inrush
current, 0.25-A current
flow
50 VA with 2.5-A inrush
current, 0.25-A current
flow
50 VA with 2.5-A inrush
current, 0.25-A current
flow
150
80
100
50
100
50
ON for 1 s,
OFF for 2 s
ON for 1 s,
OFF for 2 s
ON for 1 s,
OFF for 2 s
AC solenoid
100 VA with 5-A inrush
current, 0.5-A current
flow
100 VA with 5-A inrush
current, 0.5-A current
flow
100 VA with 5-A inrush
current, 0.5-A current
flow
4
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