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1. Load switch When switching with a very small load after switching with a large load, “contact failure by small load
switching” may occur due to particles generated during switching of the contact with large load. Please
note that or contact us.
７. Contact
reliability
2. Installation
condition
Note that if it is connected or installed with a high heat-capacity such as bas bar, connector, harness,
and PCB, heat removal phenomenon at low temperature will make relay terminals and contacts cool and
condensate a small amount of organic gas inside the relay, which may cause a contact failure. So,
please contact us before use.
1. Transient
state
Contact resistance consists of dynamic and static contact resistance. “Contact resistance” on the
catalogue and the specifications refers to static contact resistance. Dynamic contact resistance usually
shows a large value due to just after the contact operation. Please contact us if a stable contact
resistance is necessary soon after a relay is turned on.
8. Contact
resistance
2. Contact
voltage,
current
Note that if the contact-applied voltage is small (at 6V or less) and contact-applied current is small (at 1A
or less), contact resistance may become a larger value due to a small amount of film on a contact
surface.
1. Coil applied
voltage
Mechanical relays produce an operational noise at operate and release time. Note that if the coil-applied
voltage is higher at operate time, the noise becomes larger.
9. Operate
noise
2. Operate
noise at
installation
It is necessary to test relays in actual installation condition because operate noise may become larger in
the installation condition than with a relay by itself due to resonance and sympathetic vibrations of
installation PCB and system module.
Note that if a large current is applied to the contact, electromagnetic repulsion makes contact vibrate and
produces an abnormal noise. Please contact us if quietness is required.
10.Mechanical
noise
1. Abnormal
noise
Note that if an external vibration and shock are applied to a relay while the relay turns off, a movable part
of the relay may vibrate and produce a noise. So, please test in the actual use condition if quietness is
required.
11. Electrical
noise
1. Serge
voltage
When the relay turns off, serge voltage is generated from the coil. This serge voltage can be reduced if a
resistor is connected in parallel to the coil. Likewise, it can be reduced more if a diode instead of resistor
is connected in parallel.
However, please contact us or note that if a resistor or a diode is connected in parallel electrical life may
be affected due to slowing down of release time.