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1. General Contact performance is significantly influenced by voltage and current values applied to the contacts (in
particular, the voltage and current waveforms at the time of application and release), the type of load,
frequency of switching, ambient atmosphere, contact switching speed, and of bounce, which lead the
various other damages such as unsuitable operation contact transfer, welding, abnormal wear, increase
in contact resistance. Therefore, please confirm that in actual use conditions such as actual circuit and
actual load or contact our company.
In the case of switching on and off with inductive loads such as coil, magnet crutch, and solenoid, the arc
at switching can cause a severe damage on contacts and greatly shortening of life. In addition, in the
case of switching at a high frequency, a blue-green corrosion may be developed. So, please contact our
company to use it.
2. Inductive
load
If the current in the inductive load is relatively small, the arc discharge decomposes organic matter
contained in the air and causes black deposits (oxides, carbides) to develop on the contacts. This may
result in contact failure. So, please contact our company to use it.
Large inrush current enhancing contact welding will be impressed. Its current value is greatly affected by
wiring resistance, switching frequency and ambient temperature. The load current characteristics in
actual circuit and actual use condition must be examined and sufficient margin of safety must be
provided in selection of a relay.
3. Lamp load
It is dangerous to use a lamp load whose nominal current is small even a large nominal current has been
tested beforehand.
Please contact us when switching at nominal current with a small lamp load (40W or less), because
continuous ON failure may occur due to locking caused by contact-transfer phenomenon when switching
arc is locally concentrated.
4.Electric-
discharge
lamp load
Its load current tends to cause contact welding easily because its inrush current is larger than that of the
regular lamp load. The load current characteristics in actual circuit and actual use condition must be
examined and sufficient margin of safety must be provided in selection of a relay.
5. LED lamp
load
It is necessary to check the contact reliability because the load current of the LED load is very small.
Please contact us before use.
6. Other lamp
load
Please contact us before use of new structured lamp except for halogen, Electric-discharge lamp, and
LED.
When using of NC contact side of 1C contact for the motor brake, mechanical life might be affected by
the brake current. Therefore, verify in actual use conditions with actual circuit.
7. Motor load
Note that larger inductivity of motor may cause contact damage and transfer even the motor load current
is same.
8. Capacitor
load
Note that its load current tends to cause contact welding and contact transfer easily because its inrush
current is generally large which has a small break current and a short time period to reach an inrush
peak value.
Also, inrush current value is influenced by wiring resistance. Therefore, the inrush current in actual circuit
must be examined and sufficient margin of safety must be provided in selection of a relay.
9. Resistance
load
This load causes relatively-less contact damage since its inrush current is not large. Select a relay based
on the rating control capacity, or contact us.
10. Small
electric
current
load
If the switching current is small (2A or less), contact reliability decreases since the contact surface is not
cleaned by switching arc. So, please contact us for use.
11. Load
polarity
Electrical life may be affected by load polarity (+/-) connecting to relay contacts. So, please verify them in
actual use polarity.
4. Load,
Electrical life
12. Voltage
drop of
power
supply
Under a circuit which inrush current is applied to such as lamps and capacitors, the moment the contact
is closed, voltage drop to the coil, return of relay, or chattering may occur. Note that it may remarkably
reduce the electrical life.
Load