3-23
D No-fuse Breakers (NFB)
When selecting no-fuse breakers, take into consideration the maximum output current and the inrush
current.
Maximum input current:
The momentary maximum output for a Servo Driver is approximately three times that of the rated out-
put, and a maximum output of three seconds can be executed. Therefore, select no-fuse breakers with
an operating time of at least five seconds at 300% of the rated maximum output. General-purpose and
low-speed no-fuse breakers are generally suitable. The table in 3-2-3 Terminal Block Wiring shows the
rated power supply input currents for each Servomotor. Select a no-fuse-breaker with a rated current
greater than the total effective load current (when multiple Servomotors are used). When making the
selection, add in the current consumption of other controllers, and so on.
Servo Driver inrush current:
With low-speed no-fuse breakers, an inrush current 10 times the rated current flows for 0.02 second.
For a simultaneous inrush for multiple Servo Drivers, select a no-fuse-breaker with a 20-ms allowable
current greater than the total inrush current shown in the following table for the applicable Servomotor
models.
W Power
supply
voltage
Model Capacity Rated
current
A (rms)
Inrush
current
(main power
supply
circuit)
A (0-p)
From rated
current
(*125%)
No-fuse breaker
model
Single-
100 WTA3HL 30 W 1.1 90 1.375 NF30-SW 10A
phase
100 WTA5HL 50 W 1.8 90 2.25 NF30-SW 10A
100 WT01HL 100 W 3 90 3.75 NF30-SW 10A
100 WT02HL 200 W 5.2 90 6.5 NF30-SW 10A
Single-
200 WTA3H 30 W 0.8 90 1 NF30-SW 10A
phase
200 WTA5H 50 W 1.1 90 1.375 NF30-SW 10A
200 WT01H 100 W 2 90 2.5 NF30-SW 10A
200 WT02H 200 W 3.4 90 4.25 NF30-SW 10A
200 WT04H 400 W 5.5 90 6.875 NF30-SW 10A
Three-
200 WT05H 450 W 4 130 5 NF30-SW 15A
phase
200 WT08H 750 W 5.4 130 6.75 NF30-SW 15A
200 WT10H 1 kW 7 130 8.75 NF30-SW 15A
200 WT15H 1.5 kW 9.5 130 11.875 NF30-SW 15A
200 WT20H 2 kW 12 140 15 NF30-SW 20A
200 WT30H 3 kW 17 140 21.25 NF30-SW 30A
200 WT50H 5 kW 28 140 35 NF50-SW 50A
200 WT60H 6 kW 32 140 40 NF50-SW 50A
200 WT75H 7.5 kW 41 140 51.25 NF100-SW 75A
200 WT15K0H 15 kW 81 140 101.25 NF100-SW 125A
D Surge Absorbers
Use surge absorbers to absorb surges from power supply input lines due to lightning, abnormal volt-
ages, etc. When selecting surge absorbers, take into account the varistor voltage, the amount of surge
immunity, and the amount of energy resistance. The surge absorbers shown in the following table are
recommended.
System Design and Installation
Chapter 3
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