Allen-Bradley 509-DAD NEMA Size3 Non-Reversing Starter Unit

Module Feature

509-DAD belongs to Bulletin 509 NEMA full voltage non-reversing starter manufactured by Allen-Bradley (Rockwell Automation). NEMA Size3 open type assembly,control coil rated 115~120V,60Hz. It is equipped with eutectic alloy thermal overload relay for motor overcurrent protection. Integrated auxiliary contacts for PLC status feedback and control interlock. High current capacity design for heavy-duty squirrel cage induction motor direct starting. Widely used for large fans,water pumps,conveyors and heavy process automation equipment.

Working principle

When the control coil is energized,the main contactor closes and full three-phase mains voltage is applied directly to motor terminals. The eutectic alloy overload relay continuously monitors motor current. Once overload occurs,the alloy melts and trips contactor to cut off motor power. Auxiliary contacts output running and fault status signals to external control system.

Onboard components

Main contactor assembly,115-120V 60Hz coil,eutectic alloy thermal overload relay,auxiliary contact set,main power terminal block,control terminal block,metal mounting base plate.

LED indicators

No built-in LED indicators; status feedback comes from auxiliary contact signal to external control cabinet.

Hardware self-diagnosis

Contact wear inspection,coil continuity resistance test,overload relay trip function test,wiring short circuit detection.

Programming software

No dedicated programming software,controlled by external PLC or hardwired relay logic.

Electrical & Process Parameters

Model:509-DAD Brand:Allen-Bradley Device type:Bulletin509 NEMA Size3 Full Voltage Non-Reversing DOL Starter NEMA frame:Size3 Control coil:115~120V,60Hz Operation:Full voltage direct-on-line start Overload:Built-in eutectic alloy overload relay Mechanical life:10,000,000 operations Cooling:Natural convection cooling Protection:Thermal overload protection; short circuit protection via external fuse or circuit breaker

Mechanical & Structure

Mounting:Back plate mounting inside control cabinet Protection class:Open type IP00 bare assembly Housing:No enclosure,metal base plate

Environmental

Operating temperature:-10℃ ~ +40℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non-condensing Certification:CE,UL compliant Status: Allen-Bradley Bulletin509 NEMA Size3 open non-reversing starter with built-in eutectic alloy overload relay for heavy duty motor starting

Installation

Follow strict ESD safety procedure before handling.Mount base plate firmly inside control cabinet.Connect three-phase main power and motor cables to main power terminals.Wire control circuit to coil and auxiliary contacts.Set overload relay trip current matching motor FLA before commissioning.

Interface

Main power input terminal,motor output terminal,coil control terminal,auxiliary contact terminal.

Diagnostic

Coil cannot pull in:coil burnout or missing 115-120V control voltage. Overload trip:motor overload,locked rotor or incorrect FLA setting. Contact arcing:motor short circuit or excessive starting current. Auxiliary signal loss:auxiliary contact burn or loose wiring.

Product Brief

Allen-Bradley 509-DAD Bulletin509 NEMA Size3 open type full voltage non-reversing DOL motor starter,115-120V 60Hz control coil,built-in eutectic alloy thermal overload relay,for heavy-duty fan,pump and conveyor direct motor starting control.