FAQ No. FAQ02098
Question
The Relays operates but there is no contact continuity. Why is this?
Answer
The presumed reasons are as follows:
(1) Dropping the Relay or other shock may deform
the internal structural parts of the Relay.
Shock due to accidentally dropping the Relay alone will deform the
internal structural parts and result in unstable Relay contacts. Use
appropriate caution when handling the Relay.
(2) The service life has been exhausted due to
contact wear
Load switching subjects the contacts to wear. When the Relay is near the
end of its service life, it will operate, but the continuity will be
unstable. Replace the Relay.
(3) Contact Faults When Switching Microloads
Using a Relay with silver or silver-alloy contact material to switch a
microload generates sulfide coating and insulation coating and results in
contact faults.
To switch a microload, we recommend you use a Relay with gold-plated
bifurcated crossbar contacts or twin contacts.
(4) Dust or Other Foreign Matter between the
Contacts
Foreign insulating material, such as dust, molding powder, wire scraps, or
coatings, between the contacts will cause contact faults, especially with
exposed models. In such environments, we recommend using the Relay in
case.
(5) Contact Faults When Switching Inductive Loads
Arc discharge that occurs between contacts when switching inductive loads,
such as solenoids and valves, generates carbon. Carbon accumulated on
contact surfaces results in unstable continuity depending on the load.
Take countermeasures against surge appropriate for the load.
Other General-purpose Relay
FAQs
 What is the contact form?
Is there any problem applying 200 VAC to a coil with 100-VAC specifications?
What is a failure rate?
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