Allen-Bradley 150-A135NBDB-A Smart Motor Controller, 135 A SMC Plus Soft Starter

Product Overview

The Allen-Bradley 150-A135NBDB-A is a Bulletin 150 SMC Plus smart motor controller, a solid-state microprocessor-based soft starter engineered to bring three-phase squirrel-cage induction motors smoothly up to speed and, thanks to its pump control option, smoothly back down again. Where a conventional across-the-line starter slams the motor with six to eight times full-load current on every start, the Allen-Bradley 150-A135NBDB-A ramps the motor voltage through its SCR power bridge, so torque builds gradually, inrush stays under control, and mechanical shock to couplings, belts, gearboxes and pump impellers is dramatically reduced.Decoding the catalog string, 150 is the Bulletin number, A135 is the 135 A standard-duty rating covering 5 to 100 hp at 480 V AC, N denotes the open-type chassis, BD identifies the 200 to 480 V AC three-phase input, the following B selects the Pump Control option function, and the trailing -A marks the hardware series. In practical terms this is the pump-optimised variant of the largest standard SMC Plus frame.Within an automation architecture, the Allen-Bradley 150-A135NBDB-A sits between the branch protection and the motor, replacing the traditional contactor-plus-overload-relay pair with a single device that combines soft starting, electronic motor protection, diagnostics and selectable auxiliary contacts. As an open-type controller it is intended for panel mounting inside a suitably rated enclosure. Because the SMC Plus generation is mature and discontinued, today the Allen-Bradley 150-A135NBDB-A is sourced primarily as a like-for-like maintenance spare for installed machines, where fitting a known-good unit is far cheaper than re-engineering a starter panel around a current-generation replacement.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	Allen-Bradley 150-A135NBDB-A
Manufacturer	Rockwell Automation (Allen-Bradley)
Product Type	SMC Plus Smart Motor Controller / Solid-State Soft Starter
Series / Platform	Bulletin 150 SMC Plus (SMC-2 generation)
Catalog Number Breakdown	150 – A135 – N – BD – B – A (Bulletin / 135 A / Open type / 200–480 V AC / Pump Control / Series A)
Rated Operational Current	135 A standard duty; 105 A heavy duty
Motor Power Rating	5–100 hp @ 480 V AC standard duty; 5–75 hp @ 480 V AC heavy duty
Input Line Voltage	200–480 V AC, 3-phase, 50/60 Hz (+10% / −15%)
Control Supply Voltage	100–240 V AC, single-phase, 50/60 Hz (+10% / −15%)
Control Power Requirement	30 VA, plus 45 VA for the heatsink fan on 97 A and 135 A units
Starting Modes	Soft Start (2–30 s), Current Limit (50–500% FLA), Kickstart (500%, 0.4–2 s), Full Voltage (<0.25 s)
Initial Torque Adjustment	5–90% of locked rotor torque
Option Function Fitted	B — Pump Control (start 2–30 s, stop 2–120 s)
Maximum Heat Dissipation	410 W at rated current
Repetitive Peak Inverse Voltage	1400 V
Auxiliary Contacts	1 NO + 1 NC, selectable normal or up-to-speed operation
Protective Functions	Start fault, stalled motor, temperature fault, line fault (phase loss, open motor lead, shorted SCR)
dv/dt Protection	RC snubber network; optional 220 J metal-oxide varistor transient suppression
Operating Temperature	0 °C to +50 °C
Storage Temperature	−40 °C to +85 °C
Relative Humidity	5–95%, non-condensing
Altitude	2000 m without derating
Enclosure / Protection Class	Open type chassis, IP20 / NEMA 1, for panel mounting
Cooling Method	Fan cooled (97 A and 135 A frames)
Dimensions (W × H × D)	Approx. 248 × 337 × 230 mm
Weight	Approx. 11.3 kg
Certifications	UL, cUL, CSA, CE
Lifecycle Status	Discontinued; functional replacement is the SMC Flex 150-F135NBD family

Main Features and Advantages

Gentle starting that protects the whole drivetrain: The Allen-Bradley 150-A135NBDB-A ramps motor voltage from an adjustable initial torque of 5 to 90 percent of locked-rotor torque over a 2 to 30 second ramp, or holds inrush to between 50 and 500 percent of full-load amperes in current-limit mode. A 500 percent kickstart pulse lasting 0.4 to 2 seconds is available to break high-inertia loads free. The practical effect is that belts stop slipping, gearboxes stop hammering, couplings last longer, and upstream breakers stop nuisance-tripping on start.Pump control built into the base unit: This is the B-option variant, so the Allen-Bradley 150-A135NBDB-A ships with the pump control algorithm already resident. Stretching the stop ramp across 2 to 120 seconds lets the motor decelerate gradually, which is the standard remedy for water hammer in long discharge mains — the pressure transient responsible for burst pipework, damaged valve seats and destroyed pump seals. No external timer, no add-on card, no extra panel space.Electronic motor protection: An on-board microcomputer continuously supervises both the motor and the supply, tripping on start fault, stalled motor, over-temperature and line fault, the last of which covers phase loss, an open motor lead and a shorted SCR. Combined with dv/dt protection through an RC snubber network, this turns what would otherwise be a simple starter into a genuine protective device.Straightforward commissioning and diagnostics: Adjustments are made with DIP switches and rotary digital switches on the control module, so no programming software or handheld terminal is required. Energy saver and stall detection are individually selectable, and the auxiliary contacts can be configured for normal or up-to-speed indication. Front-panel LEDs report control voltage, starting, running and fault states, with a dedicated FAULT LED plus individual condition LEDs that tell maintenance staff immediately what went wrong rather than leaving them to guess.