FAQ No. FAQ02800
Question
What kind of guidelines are there for determining the service life of a
Relay?
Answer
There are a number of ways a Relay can fail at the end of its service
life, such as contact welding, faulty contact, and insulation degradation.
Guidelines for Determining If a Relay Is Still
Serviceable
|
Item |
Specified value |
|
Appearance |
Make sure there are no
loose, deformed, or scratched parts. |
|
Insulation resistance |
1 MΩ min.
unless otherwise specified |
|
Dielectric strength |
75% of initial standard
value or higher |
|
Coil resistance |
From 95% of the initial
standard lower limit to 125% of the initial standard upper limit |
|
Must operate voltage |
1.2 times the initial
standard or lower |
|
Must release voltage |
0.5 times the initial
standard or higher |
|
Operating time |
1.2 times the initial
standard or lower |
|
Release time |
Twice the initial standard
value or lower |
|
Contact resistance |
Contact rated current or
switching current (A) |
Measurement current (A) |
After contact resistance
test (Ω) |
|
Less than 0.01 |
0.001 |
100 |
|
0.01 - 0.1 |
0.01 |
20 |
|
0.1 - 1 |
0.1 |
5 |
|
More than 1 |
1 |
2 |
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| 
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