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Load Inrush Current Wave and Time
(1) Incandescent Lamp Load
i
i
i i
o
o
Incandescent lamp
Approx. 1/3 second
Inrush current/rated current:
≒
i/i
10 to 15
times
0
≒5 to 10 times
(4) Motor Load i/i
0
i i
Steady
Starting
state Braking
0.2 to 0.5 second
• Conditions become more harsh if plugging or
inching is performed since state transitions are
repeated.
• When using a relay to control a DC motor and
brake, the on time inrush current, steady-state
current and off time brake current differ depending
on whether the load to the motor is free or locked.
In particular, with non-polarized relays, when
using from B contact of from contact for the DC
motor brake, mechanical life might be affected by
the brake current. Therefore, please verify current
at the actual load.
Panasonic Corporation Electromechanical Control Business Division
industrial.panasonic.com/ac/e/
≒3 times
(2) Mercury Lamp Load i/i
0
i i
3 to 5 minutes
The discharge tube, transformer, choke coil, capacitor, etc., are combined in
common discharge lamp circuits. Note that the inrush current may be 20 to 40
times, especially if the power supply impedance is low in the high power factor type.
(5) Solenoid Load
≒10 to 20 times
i/i
0
i
i
o
o
i i
Free
Lock
Load
0.07 to 0.1 second
Note that since inductance is great,
the arc lasts longer when power is cut.
The contact may become easily worn.
Cautions for Use of Solid State Relays
Contacts
L
i
i
C
o
o
(for high power factor type)
(6) Electromagnetic
Contact Load
≒3 to 10 times
i/i
0
i i
i
i
o
o
1 to 2 cycles
(1/60 to 1/30 seconds)
ー 13 ー
Panasonic Corporation 2022
(3) Fluorescent Lamp Load
≒5 to 10 times
i/i
0
i i
10 seconds
10 seconds
or less
or less
(7) Capacitive Load
≒20 to 40 times
i/i
0
i
i
o
o
i
i
i i
o
o
1/2 to 2 cycles
(1/120 to 1/30 seconds)
ASCTB400E 202201
i
i
o
o
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