Filter
Top Products
43
∗ Select a UL and cUL certified fuse with Class T fuse equivalent cut-off speed or faster with the appropriate rating for
branch circuit protection, or a UL489 molded case circuit breaker (MCCB) in accordance with the table below.
∗ Maximum allowable rating by US National Electrical Code. Exact size must be chosen for each installation.
∗ When using the electronic thermal relay function as motor overload protection, set the rated motor current in Pr. 9
Electronic thermal O/L relay.
∗ Short circuit current ratings
Suitable For Use in A Circuit Capable of Delivering Not More Than 5 kA rms Symmetrical Amperes, 264V Maximum.
FR-D720-K-G 0.2 0.4 0.75 1.5 2.2 3.7
Rated fuse voltage(V) 240V or more
Fuse maximum
allowable rating
(A)∗
Without power factor
improving reactor
15 15 20 30 40 60
With power factor
improving reactor
15 15 20 20 30 50
Molded case circuit breaker (MCCB)
Maximum allowable rating (A)*
15 15 15 20 25 40
This function detects the overload (overheat) of the
motor, stops the operation of the drive unit's output
transistor, and stops the output.
(The operation characteristic is shown on the left)
∗1 When 50% of the drive unit rated output current
(current value) is set in Pr. 9
∗2
The % value denotes the percentage to the drive unit rated
output current. It is not the percentage to the motor rated
current.
200
105%
50
125100
150
100
200
300
600
50
60
70
25 75 175
400
500
(s) unit display in this region
(min) unit display in
this region
Operation time (min)Operation time (s)
300r/min or more
Operation region
Region on the right of
characteristic curve
Non-operation region
Region on the left of
characteristic curve
0
The ratio of motor current to Pr.9 Electronic thermal O/L relay
Electronic thermal relay function operation characteristic