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Chapter 1 Specications Check

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.

IAI MSEL User Manual

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