4-24
4-3 Wiring Conforming to EMC Directives
4
System Design
îš„ Surge Absorbers
 Use surge absorbers to absorb lightning surge voltage or abnormal voltage from power supply
input lines.
 When selecting surge absorbers, take into account the varistor voltage, the allowable surge
current, and the energy.
 For 200-VAC systems, use surge absorbers with a varistor voltage of 620 V.
 The surge absorbers shown in the following table are recommended.
Note 1. Refer to the manufacturers’ documentation for operating details.
Note 2. The surge immunity is for a standard impulse current of 8/20 µs. If pulses are wide, either
decrease the current or change to a larger-capacity surge absorber.
Dimensions
Equalizing Circuits
Maker Model
Max.
limit
voltage
Surge
immunity
Type Remarks
Okaya
Electric
Industries
Co., Ltd.
R·A·V-781BWZ-4
700 V
±20%
2500 A
Block
Single-phase
100/200 VAC
R·A·V-781BXZ-4
700 V
±20%
2500 A
Three-phase
200 VAC
20028
41
4.5
4.2 dia.4.2 dia.
11
5.5
28.5
5.5
1128.5
20028
41
4.5
Single-phase BWZ Series Three-phase BXZ Series
Single-phase BWZ Series Three-phase BXZ Series
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