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Square D DPA Auxiliary Contact Block for Definite Purpose Contactors
The Square D DPA Auxiliary Contact Block is an add-on auxiliary contact module engineered for Series B versions of 8910DPA definite purpose contactors, 8911DPS definite purpose starters, and 8965 reversing hoist contactors. It provides a 1 NO (normally open) and 1 NC (normally closed) contact configuration rated 3 A at 120 VAC on an inductive control circuit per UL 508, giving panel builders and OEMs a reliable way to add auxiliary switching and interlock signaling to existing definite purpose control assemblies. The module is CSA certified and UL Recognized for use in commercial and industrial control panels.
Key Features
- Contact Configuration: 1 NO and 1 NC auxiliary contact arrangement for status signaling and interlocking on definite purpose contactors and starters.
- Electrical Rating: Rated 3 A at 120 VAC inductive control circuit per UL 508 for reliable control-circuit switching.
- Compatibility: Designed for Series B 8910DPA definite purpose contactors, 8911DPS definite purpose starters, and 8965 reversing hoist contactors; includes a normally closed contact suited to 20A-90A definite purpose contactors.
- Terminal Type: Screw clamp terminal connections for secure, serviceable field wiring.
- Product Range: Part of the Square D DPA definite purpose contactor accessory range.
- Application Segments: Suited to both commercial and industrial control panel environments.
Certifications & Compliance
- CSA Certified
- UL Recognized
Technical Specifications
- Range Of Product: DPA
- Toxic Heavy Metal Free: Yes
- Mercury Free: Yes
- Warranty: 18 months
- Warranty Period: 18 months
- Returnability: Yes
- Take Back: No
- Sustainable Packaging: Yes
- Packaging Without Single Use Plastic: Yes
- Packaging Made With Recycled Cardboard: Yes
- With Recycled Cardboard: Yes
- Without Single Use Plastic: Yes
- ROHS Eur In Scope: Yes
- ROHS Exemption Information: Yes
- China ROHS Label: 1
- Legacy WEEE Scope: In
- WEEE Product Category: 5
- Serviceability: No
- Traceability: No
Typical Applications
- Definite Purpose Contactor and Starter Control Circuits
- Auxiliary Switching and Interlocking on 8910DPA and 8911DPS Assemblies
- 8965 Reversing Hoist Contactor Control
- Commercial and Industrial Control Panel Assembly
- Panel Builder and OEM Control Panel Upgrades
Why Square D?
Square D auxiliary contact blocks are CSA certified and UL Recognized, giving panel builders, OEMs, and contractors a dependable way to expand the signaling and interlock capability of definite purpose contactors and starters. Screw clamp terminals support secure field wiring, and the 3 A, 120 VAC control-circuit rating per UL 508 keeps the module suited to standard control power applications across commercial and industrial installations.
Manufacturer Resources
Product Specs
- Series:
- DPA
- Voltage Rating:
- 120VAC
- Department:
- Electrical
- Listing:
- UL Recognized
- Amperage Rating:
- 3A
- Product Type:
- Auxiliary Contact
- Standards:
- CSA
- Country of Origin:
- China
- Product Group:
- Motor Control & Automation
- Product Subgroup:
- Contactors & Relays
Square D 9999D10 – Frequently Asked Questions
1) What contact arrangements can I order on the Square D DPA auxiliary contact block?
Two arrangements: 1 NO only (part 9999D10) and 1 NO plus 1 NC (part 9999D11). Order the 1 NO/1 NC version if you need both a status signal and an interlock off the same block; the 1 NO version covers simple run-status or holding-circuit duty.
2) Can I switch 120V control power through this Square D auxiliary contact block?
Yes. The block is rated 3 A at 120 VAC on an inductive control circuit per UL 508, which covers a standard 120 V control transformer feeding relay coils, pilot lights, or an interlock to another contactor coil. It is a control-circuit device, not a load-switching pole, so do not run motor or lighting load through it.
3) What is the closest 1NO/1NC auxiliary contact to the Square D 8910DPA DPA contact block if the contactor is not a definite purpose unit?
The Square D DPA auxiliary contact block is built for Series B 8910DPA definite purpose contactors, 8911DPS definite purpose starters, and 8965 reversing hoist contactors, and one of its arrangements is 1 NO/1 NC. For a manual motor protector instead of a definite purpose contactor, the ABB HK1-11 is a side-mount auxiliary contact with the same 1NO/1NC arrangement made for ABB MS116 and MS132 manual motor starters. Match the auxiliary to the device body it clips onto, since these blocks are not interchangeable across families.
4) Is this auxiliary contact block approved for use in a UL listed control panel?
It is UL Recognized and CSA certified, which is the usual basis for using it as a component inside a commercial or industrial control panel assembly. The 3 A, 120 VAC control rating is per UL 508.
5) If I need a 2NO auxiliary contact instead of 1NO/1NC, is the Square D DPA block the right part?
No. The DPA block comes as 1 NO or as 1 NO/1 NC only, so there is no two-normally-open version in this family. For a 2NO arrangement, the Eaton auxiliary contact kit C320DPG20 is 2NO rated 10A at 600V, and the Eaton AR/ARD four-pole top deck adder (ARA20) is also a 2NO configuration, both for their own Eaton gear.
6) What should I use for auxiliary status contacts on a lighting contactor instead of the Square D DPA block?
The Square D DPA auxiliary contact block is an accessory for definite purpose contactors and starters. For a lighting contactor, the ABB CR460XB2 is a 2-pole auxiliary contact block sold as a 460 Line lighting contactor accessory. Choose based on the host contactor family, since each block is keyed to its own line.
7) Can I get a single normally open auxiliary contact instead of the NO/NC pair on the Square D 8910DPA block?
Yes. The Square D DPA auxiliary contact block comes in a 1 NO arrangement as well as a 1 NO/1 NC arrangement, so you can order just the single normally open contact for simple run-status signaling. Among other brands, the ABB OA1G10 is a 1-NO auxiliary contact switch, though it is intended for OT and OS disconnect switches rather than definite purpose contactors.
8) I need to add contacts to a machine tool relay, not a definite purpose contactor - what takes the place of the Square D DPA block?
The Square D DPA auxiliary contact block adds a normally open and normally closed contact to Series B 8910DPA contactors and 8911DPS starters. For a machine tool relay, the Eaton ARA20 is a four-pole top deck adder for the AR/ARD machine tool relay line with a 2NO contact configuration. The Eaton adder stacks on the relay deck, so it is a different mechanical approach than the DPA add-on module.
9) Does the Square D DPA auxiliary contact block meet RoHS and heavy-metal-free purchasing requirements?
It is in scope for European RoHS, and is listed as toxic heavy metal free and mercury free. Packaging is recycled cardboard with no single-use plastic, which matters for institutional and sustainable-sourcing specs. Country of origin is China.
How fast can I get the Square D 9999D10 delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D 9999D10 come with a warranty?
Absolutely. The Square D 9999D10 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Square D 9999D10?
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