100-DS1-20

Overview of Allen Bradley 100-DS1-20

The Allen Bradley 100-DS1-20 is an auxiliary contact assembly designed for use with ABB Bulletin 300 series contactors and motor starters. This component provides two normally open contacts to expand control circuit capabilities in industrial motor control applications. The 100-DS1-20 mounts directly to the left or right side of NEMA size 4-5 contactors, including models 300, 305, and 309. This auxiliary contact block integrates seamlessly with existing motor control systems to provide additional switching functions for control logic, interlocking, or signaling purposes. The compact design maintains the footprint of the main contactor while adding critical control functions. Manufactured by Allen Bradley, this component meets rigorous industrial standards for reliability in demanding automation environments.

Key Features of Allen Bradley 100-DS1-20

• Two normally open contact configuration for versatile control applications
• Left or right side mounting capability for flexible installation
• Compatible with NEMA size 4-5 contactors in the Bulletin 300 series
• Direct mounting design requires no additional hardware
• Industrial-grade construction for long service life

Technical Specs of 100-DS1-20

• Contact Configuration: 2 NO (normally open)
• Mounting Position: Left/right inside mounting
• Compatible Series: ABB Bulletin 300, 305, 309
• NEMA Size Compatibility: 4-5
• Product Type: Auxiliary contact block

Applications / Use Case

The Allen Bradley 100-DS1-20 auxiliary contact serves critical functions in motor control panels and industrial automation systems. Common applications include providing feedback signals to programmable logic controllers, creating interlock circuits between multiple contactors, and activating indicator lights or alarms based on contactor status. In pump control systems, these contacts signal when motors are energized or de-energized. Manufacturing facilities use the 100-DS1-20 to coordinate sequential motor starting operations where one motor must start before another. The auxiliary contacts also support remote monitoring systems by providing discrete input signals to SCADA systems. HVAC systems utilize these contacts for fan control interlocking with heating or cooling equipment. The normally open configuration makes the 100-DS1-20 ideal for fail-safe control schemes where circuit activation requires positive contactor engagement.

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