Two Allen-Bradley Bulletin 160 SSC drives can show the same motor-power rating and still belong to different electrical and control configurations. A direct replacement decision must therefore begin with the complete catalog number, the motor nameplate, and the existing wiring—not with the kW or HP line alone.
The reason is practical: voltage class, drive current, controller type, enclosure construction, and factory options are encoded separately. A mismatch in any one of those items can change the supply connection, motor suitability, speed-command wiring, mechanical installation, or operator interface.
Short answer: equal motor power is a starting point for comparison, not proof that two Bulletin 160 SSC drives are interchangeable.
Why equal motor power is not enough
Motor power describes the size of load a drive is intended to serve, but it does not identify the electrical system. In the Bulletin 160 SSC catalog number, the voltage-class character separates the 200–240 V group from the 380–460 V group. The current code then identifies the rating within that voltage class.
For example, 160-AA08NSF1 and 160-BA04NSF1 are both associated with a 1.5 kW (2 HP) motor rating. The first is a 200–240 V, 8.0 A drive; the second is a 380–460 V, 4.0 A drive. Matching power does not make their supply and current requirements equal.
| Catalog number | Motor rating | Input voltage class | Output current |
|---|---|---|---|
| 160-AA08NSF1 | 1.5 kW (2 HP) | 200–240 V AC, three-phase | 8.0 A |
| 160-BA04NSF1 | 1.5 kW (2 HP) | 380–460 V AC, three-phase | 4.0 A |
| 160-AA12NSF1 | 2.2 kW (3 HP) | 200–240 V AC, three-phase | 12.0 A |
| 160-BA06NSF1 | 2.2 kW (3 HP) | 380–460 V AC, three-phase | 6.0 A |
Read the complete Bulletin 160 catalog number
Each catalog-number position describes a different part of the drive. The sequence identifies the Bulletin family, voltage class, current rating, enclosure type, controller type, and any factory-installed programmer or status option. A shortened model reference can hide a difference that matters at installation.
SF1 and PS1 use different speed-command paths
An SF1 Analog Signal Follower receives its commanded speed through the analog reference circuit. The control terminal block carries the reference and command inputs to the controller, which processes them before producing motor output.
160-AA02NSF1, 160-AA03NSF1, and 160-AA04NSF1 all use SF1 Analog Signal Follower control, so the external speed reference enters through the same type of command path. Their current codes are different, however, and the motor full-load current must still be checked for each model.
A PS1 Preset Speed controller selects programmed speed values through digital control inputs. Even when the supply and motor rating agree, changing from SF1 to PS1 changes the way the machine issues its speed command.
Enclosure, terminals, and options must also match
The enclosure character changes the physical format of the drive. Open IP20, low-profile, and chassis-mount versions do not present the same panel arrangement, so dimensions and mounting conditions must be checked against the installed unit.
The terminal groups also have different jobs. TB1 receives line power and contains the brake connection, TB2 carries the motor output and capacitor-module connection, and TB3 is assigned to control wiring. Existing conductors must return to the correct functional group rather than merely to a terminal in the same physical position.
The suffix can also identify a Ready/Fault indicating panel or a Program Keypad. A replacement should retain the status and operator functions used by the machine rather than matching only the power stage.
What to check before ordering a replacement
Use the original drive nameplate, motor nameplate, installed wiring, and saved settings to confirm the replacement. The checks below keep the selection tied to the actual machine.
- Record the complete catalog numberInclude every character after Bulletin 160, including controller and factory-option suffixes.
- Confirm the incoming supplyCheck voltage class, phase arrangement, and the installed branch circuit.
- Read the motor nameplateMatch motor voltage and full-load current in addition to kW or HP.
- Identify the speed-command methodDetermine whether the machine sends an analog reference or selects preset speeds.
- Check the enclosure and mountingConfirm construction, dimensions, clearances, and panel arrangement.
- Trace the terminal functionsRecord line, motor, brake, capacitor-module, and control connections before removal.
- Preserve the configurationRecord programmed values and verify how they will be entered into the replacement.
Questions buyers ask before changing a Bulletin 160 SSC drive
Can 160-AA08NSF1 replace 160-BA04NSF1 because both are 1.5 kW?
No. 160-AA08NSF1 is a 200–240 V, 8.0 A drive, while 160-BA04NSF1 is a 380–460 V, 4.0 A drive. Their supply classes and current ratings are different.
Can an SF1 controller directly replace a PS1 controller?
Not as a wiring-equivalent substitution. SF1 follows an analog reference, while PS1 selects programmed speeds through digital inputs. The external command circuit must match the controller type.
Is the motor-power rating enough to select the current code?
No. The current code belongs to a specific voltage class. Confirm the motor nameplate current and the actual supply voltage before selecting the drive rating.
Why must the enclosure code be checked?
The enclosure character distinguishes open IP20, low-profile, and chassis-mount construction. These versions do not have the same physical installation format.
What should be recorded before the old drive is removed?
Photograph the complete nameplate, power and control terminals, option panel, mounting arrangement, and motor nameplate. Save the programmed settings as part of the same replacement record.
Conclusion
Two Bulletin 160 SSC drives can carry the same motor-power rating and still belong to different electrical and control configurations. Treat kW or HP as the beginning of the comparison. The final decision should use the complete catalog number together with the supply, motor current, command method, enclosure, terminal functions, options, and stored configuration.
Technical reference: Rockwell Automation, Bulletin 160 SSC Variable Speed Controller User Manual, publication 160-UM009.