SS · SOFT STARTER
Select by motor current, voltage and starting duty.
Motor power is only a preliminary reference. The motor nameplate current, load type, starts per hour, ramp duty, ambient temperature and altitude determine the final model.
NJR5-ZX voltage suffix map
NJR5-ZX is an in-line soft starter family. The suffix identifies the main-circuit voltage.
| Suffix | Nominal voltage | Permitted supply range | Rated insulation voltage |
|---|---|---|---|
| ZX2 | AC220 V | AC198-264 V | AC660 V |
| ZX3 | AC380 V | AC323-437 V | AC660 V |
| ZX4 | AC460 V | AC414-504 V | AC1000 V |
| ZX5 | AC575 V | AC517-633 V | AC1000 V |
| ZX6 | AC690 V | AC621-759 V | AC1000 V |
Model code: The number before the suffix is the model-frame current, while the actual rated current in the table may be lower. Example: NJR5-90/ZX3 has 84 A rated current.
Key models around common pump duties
| Model | Voltage | Rated current | Catalog motor power |
|---|---|---|---|
| NJR5-90/ZX3 | AC380 V | 84 A | 45 kW |
| NJR5-110/ZX3 | AC380 V | 103 A | 55 kW |
| NJR5-150/ZX3 | AC380 V | 140 A | 75 kW |
| NJR5-90/ZX4 | AC460 V | 84 A | 55 kW |
| NJR5-110/ZX4 | AC460 V | 103 A | 75 kW |
| NJR5-150/ZX4 | AC460 V | 140 A | 90 kW |
North American caution: A 100 hp, 460 V motor may have nameplate or code-table current above 103 A. Do not order NJR5-110/ZX4 from power alone; a 140 A model may be required after checking the actual FLA and duty.
NJR2-D and bypass duty
NJR2-D is a 380 V soft-starter family that requires an external bypass contactor. The bypass contactor, overload protection and short-circuit protection must be coordinated as one motor-starting system.
- Confirm motor FLA instead of power only
- Confirm starts per hour and start duration
- Check whether the load is a pump, fan, conveyor or crusher
- Apply temperature and altitude derating where required