Omron OMNUC G User Manual page 214

4-3 Wiring Conforming to EMC Directives
Surge Absorbers
Use surge absorbers to absorb lightning surge voltage and 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.
Okaya Electric
4
Industries Co., Ltd.
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
Dimensions
4.2 dia.
Equalizing Circuits
Single-phase BWZ Series
4-33
Manufacturer Model
R·A·V-781BWZ-4
R·A·V-781BXZ-4
decrease the current or change to a larger-capacity surge absorber.
Single-phase BWZ Series
1 2
41
Surge immunity
700 V ±20%
700 V ±20%
Three-phase BXZ Series
4.2 dia.
1 2 3
41
Three-phase BXZ Series
Type
Single-phase
2,500 A
100/200 VAC
Block
Three-phase
2,500 A
200 VAC
Remarks