Allen‑Bradley 150-F25NBD SMC‑Flex Soft Starter Product Description

Overview

Allen‑Bradley 150-F25NBD is a SMC‑Flex Bulletin 150 smart motor soft starter from Rockwell Automation. This 150-F25NBD is open‑type, 25 A rated, for 3-phase squirrel cage induction motors, with integrated SCR bypass contactor, built‑in metering and LCD keypad. It is widely used for pumps, fans, conveyors and compressors to reduce starting inrush current and mechanical shock, for new MCC build, retrofit and spare‑part replacement of SMC‑Flex soft starter systemsRockwell A....

Features

Allen‑Bradley 150-F25NBD supports multiple start and stop modes: soft start, current limit start, kick start, soft stop, pump control and braking control. This SMC‑Flex soft starter integrates electronic motor overload protection with phase CT sensing for all three phases. 150-F25NBD comes with a backlit LCD display and local keypad for parameter setup, fault viewing and real‑time current/voltage monitoring. It has four programmable auxiliary relay contacts for status and alarm feedback. Optional communication modules support DeviceNet, PROFIBUS and EtherNet/IP for integration with Rockwell PLC systems. The internal bypass contactor cuts power loss across SCRs after ramp‑up, reducing heat generation during continuous running. It supports in‑line and inside‑delta wiring configurations and complies with UL 508, IEC 60947‑4‑2 standardsvecto-bsp-....

Specs

• Brand: Allen‑Bradley (Rockwell Automation)

• Series: SMC‑Flex Bulletin 150

• Model: 150-F25NBD

• Rated current: 25 A

• Motor rating: 5–15 Hp @ 460 V AC

• Main input voltage: 200–480 V AC, 50/60 Hz

• Control supply: 100–240 V AC

• Enclosure: Open type, cabinet mounting

• Built‑in: SCR bypass contactor, electronic overload, LCD keypad

• I/O: 4 programmable auxiliary relay contacts, PTC motor thermistor input

• Protection: Overload, phase loss, overcurrent, overtemperature, earth fault

• Standard: UL 508, IEC 60947‑4‑2

Principle

Allen‑Bradley 150-F25NBD uses phase‑controlled SCR power regulation to gradually raise motor terminal voltage during startup, limiting locked‑rotor inrush current. Once the motor completes acceleration, the integrated bypass contactor closes to carry full load current, bypassing the SCR power stage. The on-board microprocessor samples line current continuously, executes overload and fault logic, and records fault codes and runtime data. During stopping, soft stop mode reduces voltage gradually to avoid water hammer on pumps. Relay outputs send run, fault and bypass status signals to PLC or MCC control circuitRockwell A....

Applications

Allen‑Bradley 150-F25NBD is deployed in water & wastewater skids, HVAC chillers, mining conveyors, industrial fans and centrifugal pumps. This SMC‑Flex soft starter protects mechanical equipment from torque shock and reduces transformer and distribution system stress during motor startup. 150-F25NBD fits MCC cabinet overhaul and spare replacement of SMC‑Flex 25 A soft starters.

Installation & Maintenance Notes

Follow official Rockwell SMC‑Flex manual during installation of 150-F25NBD. Confirm motor FLA and set overload trip class correctly. Keep adequate side clearance for heat dissipation; bypass contactor and SCR bank generate heat during start cycles. Back up parameter settings before replacement. After replacement, verify CT wiring direction, auxiliary contact assignment and communication node address. Confirm exact part number 150-F25NBD; N suffix = 100–240 V AC control, different control voltage variants (NBR) cannot be substituted directly.