Panasonic Corporation Electromechanical Control Business Division
industrial.panasonic.com/ac/e/
Technical Terminology & Cautions for Use (Detection Switches)
Panasonic Corporation 2021
AECTB36E 202110
CAUTIONS IN A CIRCUIT
1) Contact protection is recommended when snap-action switches are
used in an inductive load circuit.
Circuit diagram
Cautions for use
r c
R
Contact for snap-action switch
(1
) r = more than 10 Ω
(
2
) In an AC circuit
Impedance of R is to be slightly
smaller than impedance of r and c.
r
c
R
Contact for snap-action switch
Can be used for both AC and DC.
Impedance of r is nearly equal to
impedance of R.
C: 0
.1
μF
R
diode
Contact for snap-action switch
(1
) For DC circuits only.
ZNR
Varistor
Contact for snap-action switch
Induction load
Can be used for both AC and DC.
2) Do not connect the contacts on individual switches to different type
or different poles of the power supply.
Examples of power supply connections (connection to different
poles)
PL
Wrong
Solenoid load
Lamp load
PL
Right
Solenoid load
Load connected to same pole
Lamp load
Example of wrong power supply connection (connection to different
poles of power supply)
This may lead to mixed DC and AC.
L
Load
L
Load
AC
DC
Wrong
3) Avoid circuits which apply voltage between contacts. (This may lead
to mixed deposition.)
Wrong
L
100 V
200 V
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