Allen-Bradley 150-F251NBD SMC Flex Smart Motor Controller

Start and protect your large motors smoothly. The Allen-Bradley 150-F251NBD is a smart motor controller (soft starter) from the SMC-Flex series. It manages high-power motors up to 251 Amps, reducing inrush current and mechanical stress for a longer equipment life.

Key Advantages of This Controller:

• Smooth Motor Starting: Reduces damaging startup current and torque spikes.
• Built-in Motor Protection: Includes electronic overload and ground fault detection.
• High Power Rating: Handles large motors up to 200 HP at 460V.
• Smart Control: Programmable features and an integrated bypass contactor for efficient run state.
• Easy to Integrate: Standard 120/240V AC control voltage for simple wiring.

Complete Product Specifications

Manufacturer: Allen-Bradley (Rockwell Automation)

Bulletin/Series: SMC-Flex Smart Motor Controller

Model: 150-F251NBD

Rated Current: 251 Amperes

Horsepower (HP) Rating: 200 HP @ 460V AC | 250 HP @ 575V AC

Input Line Voltage: 200-575V AC, 3-Phase, 50/60 Hz

Control Voltage: 120 / 240 V AC

Enclosure Type: Open (requires a protective panel)

Key Features: Electronic Overload Protection, SCR Bypass/Run Contactor, Ground Fault Detection

Contact Configuration: 1 Normally Open (NO) + 1 Normally Closed (NC) (Programmable)

Operating Temperature: 0°C to 50°C (32°F to 122°F)

Product Weight: 30.84 kg (68.00 lbs)

Installation & Wiring Overview

Install the 150-F251NBD inside a suitable industrial enclosure (NEMA-rated panel). Ensure proper spacing for cooling airflow. Connect the 3-phase main power (200-575V AC) to the line terminals. Wire the motor to the load terminals. Connect the 120/240V AC control power. Use an external ground fault sensor if that protection is required. Follow all local electrical codes and static control precautions.

Warranty Information

This Allen-Bradley product is covered by our standard 12-month warranty. This warranty guarantees the unit is free from defects in materials and workmanship.

Professional FAQs

What is the main benefit of using a soft starter like the 150-F251NBD?

It extends motor and driven equipment life by controlling the acceleration, reducing electrical stress on the windings and mechanical shock on gears and belts.

How does the integrated bypass contactor work?

After the motor reaches full speed, the controller switches power through a mechanical contactor. This bypasses the SCRs, reducing heat and saving energy during continuous run.

Do I need separate overload relays?

No. The 150-F251NBD has built-in, adjustable electronic motor overload protection, eliminating the need for separate thermal overload blocks.

Can it be used for pump or fan control?

Yes, it is excellent for centrifugal pump and fan applications. Its soft start and stop features can prevent water hammer in pipes and system pressure surges.

What is required for the ground fault detection to work?

You must install an external zero-sequence current sensor (core balance sensor) around the motor feeder cables and connect it to the controller's designated inputs.

Shipping & Delivery
This item is available for shipment. We use reliable global carriers: FedEx, UPS, and DHL. You will receive tracking information once your order is dispatched.

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