Overview
The Square D 9999D11 is an external auxiliary contact module designed for definite purpose contactors and starters. This contact block expands the logic and control capabilities of Square D DPA-series contactors by providing an additional 1 normally open (NO) and 1 normally closed (NC) contact pair. With a 600VAC, 5-ampere rating and proven mechanical life of 500,000 operations, the 9999D11 delivers reliable auxiliary signaling in industrial motor control, HVACR, and automation applications.
Key Features
- 1 normally open (NO) and 1 normally closed (NC) contact configuration
- 600VAC, 5-ampere contact rating (NEMA B600)
- Screw clamp terminal connection for easy wiring
- 500,000 mechanical life operations
- UL Listed and CSA Certified
- Direct snap-on mount to DPA-series contactors
Technical Specifications
- Voltage Rating: 600VAC
- Contact Current: 5 amperes
- Contact Configuration: 1NO/1NC
- Connection Type: Screw Clamp
- Mechanical Life: 500,000 operations
- Certifications: UL Listed, CSA Certified
- Mounting: Direct (snap-on to contactor)
Typical Applications
The Square D 9999D11 auxiliary contact block is widely used in:
- Air compressor and pump motor control
- HVACR equipment and refrigeration circuits
- Agricultural and food service equipment
- Industrial automation and machine tool control
- Interlock and safety circuit applications
Compatibility & Replacements
Compatible With
- Square D 8910DPA definite purpose contactors (20A–90A, Series B and Series C)
- Square D 8911DPS definite purpose starters
- Square D 8965 reversing hoist contactors
- Direct snap-on mounting to standard DPA contactor frames
Replaces / Drop-In Replacement For
- Square D 9999D11 (exact replacement)
- Earlier or worn auxiliary contact modules on equivalent DPA-series contactors
Works With
- 600VAC motor control circuits and branch circuits
- Hardwired relay logic and control systems
- Interlock, indicator light, and alarm circuit wiring
- Industry-standard electrical panel wiring practices
