Product Overview
The Allen-Bradley 1336F-B025-AA-EN is a member of Rockwell Automation’s Bulletin 1336 PLUS II family of adjustable frequency AC drives, engineered to deliver precise, energy-efficient speed control for three-phase induction motors in demanding industrial applications. This drive accepts a 460 VAC, 50/60 Hz three-phase input and converts it into a variable-voltage, variable-frequency output, allowing the connected motor to operate smoothly from zero speed up to and beyond its rated base speed under controlled conditions. With a 25 HP (18.5 kW) power rating and 34 A nominal output current, the 1336F-B025-AA-EN is well-suited to medium-horsepower loads such as pumps, fans, compressors, conveyors, and process machinery where adjustable speed delivers both process flexibility and energy savings.
The Allen-Bradley 1336F-B025-AA-EN belongs to a drive platform that has earned a strong reputation for reliability across decades of global deployment. The “F” in the catalog number denotes the 460 VAC voltage class, while “B025” indicates the 25 HP / 18.5 kW power rating. The suffix combination “-AA-EN” specifies the configuration: an open-style IP00 enclosure, no Human Interface Module (HIM) keypad or control interface, English-language labeling, and no brake option. This makes the 1336F-B025-AA-EN a straightforward, no-frills drive intended for panel-mount installation where control is provided by a separate PLC or automation system rather than through a local keypad.
Because the 1336F-B025-AA-EN is supplied without a HIM, it is typically integrated into a control cabinet where start, stop, speed reference, and status monitoring are handled via discrete inputs and analog signals—or through an optional communication module. This approach keeps the drive hardware simple and cost-effective while placing full operational control in the hands of the plant automation system. For maintenance teams managing legacy installations, the Allen-Bradley 1336F-B025-AA-EN remains an important spare part that can be quickly swapped into an existing 1336 PLUS II installation with minimal reconfiguration.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1336F- |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | Adjustable Frequency AC Drive / VFD |
| Product Line | Bulletin 1336 PLUS II |
| Input Voltage | 460 VAC, 3-phase, 50/60 Hz |
| Output Voltage | 0–460 VAC (3-phase) |
| Output Current | 34 A |
| Power Rating | 25 HP (18.5 kW) |
| Enclosure Rating | IP00 (Open Style) |
| Human Interface Module | None (AA suffix) |
| Control Interface | None (AA suffix) |
| Language | English (EN suffix) |
| Brake Option | None |
| Mounting | Panel mount / open enclosure |
| Application | General-purpose motor speed control |
Main Features and Advantages
Robust 25 HP Power Capability: The Allen-Bradley 1336F-B025-AA-EN delivers a full 25 HP (18.5 kW) of adjustable-frequency power, making it suitable for a wide range of medium-duty industrial loads. Its 34 A output current rating provides ample margin for motors with moderate inrush requirements, while the drive’s controlled ramp profiles prevent the sudden current surges associated with across-the-line starting. This protects both the motor windings and the upstream electrical distribution system.
Open-Style IP00 Construction: The IP00 open chassis design of the 1336F- is intended for installation inside a user-supplied industrial enclosure. This approach gives panel builders full flexibility in layout, cooling, and cable management. Because the drive itself carries no enclosure rating, it can be mounted directly to the panel backplate with adequate spacing for cooling airflow, and the cabinet can be designed to meet the specific environmental and safety requirements of the installation.
Simplified, Cost-Effective Configuration: By omitting the HIM, control interface, and brake option, the 1336F- keeps both hardware cost and configuration complexity to a minimum. For applications where the drive is controlled entirely by a PLC or relay logic scheme, these omitted features are unnecessary. The drive’s parameter set can be programmed through an optional handheld programmer or transferred from a spare drive, allowing for rapid commissioning and consistent replication across multiple machines.
Energy-Efficient Variable Speed Operation: The fundamental advantage of any AC drive is the ability to match motor speed to actual process demand. The Allen-Bradley 1336F-B025-AA-EN is particularly effective in variable-torque applications such as centrifugal pumps and fans, where reducing speed by 20% can cut energy consumption by nearly 50%. Over the service life of the installation, these savings often far outweigh the initial cost of the drive, making it a sound operational investment.
Smooth Starting and Stopping: Direct-on-line starting subjects a motor and driven load to a sudden high-current surge and abrupt mechanical acceleration. The 1336F- eliminates this shock by ramping voltage and frequency up gradually during start and down during stop. This protects both the electrical supply and the mechanical driveline, reducing nuisance tripping of upstream breakers and extending the life of belts, chains, bearings, and couplings.
