IAI MSEL, Instruction Manual, Page: 36 / 234

Chapter 1 Specifications Check
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Note 1 Rush current at the power connection continues for 5 msec. Note that the value of in-rush current
differs depending on the impedance of the power supply line.
Note 2 Leak current varies depending on the capacity of connected motor, cable length and the surrounding
environment. Measure the leak current at the point where a ground fault circuit interrupter is to be
installed when leakage protection is conducted.
Regarding the leakage breaker, it is necessary to have a clear purpose for selection such as a fire
protection or protection of human body.
Note 3 Power supply is not necessary if PIO is not to be used.
Note 4 EtherNet/IP can also communicate (teletype procedure communication) with EtherNet.
1.2.1 Selection of the Circuit Breaker
For the selection of the circuit breaker, perform it according to the following items.

Select the breaker that does not trip with the rush current. (Refer to the Operation
Characteristic Curve described in the catalogue of each manufacturer.)

For the rated breaking current, select the current value which can break the current even
when a short circuit occurs.
Rated Interrupting Current > Short Circuit Current = Power Source Current [Refer to 1.2
Basic Specifications]

Consider margin for the rated current on the circuit breaker.
Circuit Breaker Rated Current > Power Source Current [A]
×
Safety Margin (Reference 1.2 to 1.4)
1.2.2 Selection of the Leakage Breaker

Regarding the leakage breaker, it is necessary to have a clear purpose for selection such
as a fire protection or protection of human body.

Leak current varies depending on the capacity of connected motor, cable length and the
surrounding environment. Measure the leak current at the point where a ground fault
circuit interrupter is to be installed when leakage protection is conducted.