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Allen Bradley 509-DOB NEMA Contactor, 40A, 120V AC Coil

Allen Bradley 509-DOB NEMA Contactor, 40A, 120V AC Coil.

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ManufacturerAllen Bradley

Part number509-DOB

NEMA Size 2

Amperage Rating 40A

Coil Voltage 120V AC

Poles 3

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Veteran-owned

CAGE: 9NK75

NEMA Size 2 40A continuous current 120V AC coil 3-pole configuration Heavy-duty construction High reliability

Product description

The Allen Bradley 509-DOB is a NEMA Size 2, 3-pole contactor rated for 40A continuous current. It features a 120V AC coil, making it suitable for robust motor control and power switching applications. This contactor is built for durability and reliable operation in demanding industrial environments.

This unit is commonly used for starting and controlling medium-sized motors, HVAC systems, and general power distribution in manufacturing facilities, processing plants, and commercial buildings. The 120V AC coil voltage is a standard in many control systems.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, offers the Allen Bradley 509-DOB. We provide quality components and excellent service to keep your operations running efficiently and cost-effectively.

Technical specifications

NEMA Size	2
Amperage Rating	40A
Coil Voltage	120V AC
Poles	3
Control Voltage	120V AC
Mounting	Panel Mount

Common applications

Motor control

HVAC systems

Industrial automation

Manufacturing equipment

Power distribution

Pump stations

Compatible systems

Compatible with industrial control panels and systems that utilize 120V AC control power for NEMA Size 2 contactors.

Also known as

Allen Bradley 509-DOB Contactor AB 509-DOB Motor Starter 509-DOB 40A 120V AC

Replaces / compatible with

Direct replacement for Allen Bradley NEMA Size 2 contactors requiring a 40A rating and a 120V AC coil. Verify electrical connections and mounting dimensions.

Technical note

Expert tip

For applications with frequent switching cycles, ensure the contactor's electrical life rating is sufficient, or consider using a larger frame size contactor.

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Frequently asked questions

What NEMA size is the Allen Bradley 509-DOB contactor?

The Allen Bradley 509-DOB contactor is a NEMA Size 2. This size designation indicates its physical dimensions and its capacity for handling higher current loads compared to smaller NEMA sizes.