Omron SMARTSTEP 2 R88M-G Series User Manual page 171

 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.
Maker
Okaya
Electric
Industries
Co., Ltd.
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
Single-phase BWZ Series
4.2 dia.
41
Equalizing Circuits
Single-phase BWZ Series
4-3 Wiring Conforming to EMC Directives
Max.
Model limit
voltage
700 V
R·A·V-781BWZ-4
±20%
700 V
R·A·V-781BXZ-4
±20%
Surge
Type
immunity
2500 A
Block
2500 A
Three-phase BXZ Series
4.2 dia.
41
Three-phase BXZ Series
Remarks
Single-phase
4
100/200 VAC
Three-phase
200 VAC
4-26