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Square D Type S Auxiliary Contact Block, 1 NO/1 NC Isolated
The Square D Type S auxiliary contact block is an external field-convertible add-on contact designed for use with Type S magnetic contactors and starters in motor control applications. Featuring 1 Normally Open / 1 Normally Closed isolated contact configuration, this contact block mounts to the side of a contactor or starter and is rated for <= 600 V AC 50/60 Hz operational voltage with a rated breaking capacity of 6 A at 120 V AC on inductive control circuits per UL 508. It is compatible with SA-SJ Type S contactors and starters spanning NEMA Sizes 00 through 7, making it a versatile solution for panel builders, OEMs, and contractors.
Key Features
- Contact Configuration: 1 Normally Open / 1 Normally Closed isolated auxiliary contact for reliable circuit signaling.
- External Field-Convertible Design: Mounts to the side of a Type S contactor or starter for flexible field installation.
- Compatibility: For use with SA-SJ Type S contactors and starters, NEMA Size 00 through 7.
- Rated Operational Voltage: <= 600 V AC, 50/60 Hz.
- Rated Breaking Capacity: 6 A at 120 V AC inductive control circuit per UL 508.
- Terminal Type: Screw clamp terminals for secure, straightforward wiring.
- Robust Design: Robust design and reliable build for demanding industrial and commercial environments.
- Serviceable Construction: Easy to service with replaceable parts.
Certifications & Compliance
- UL Listed
- UL Recognized
- CSA
Technical Specifications
- Toxic Heavy Metal Free: Yes
- Warranty: 18 months
- Take Back: No
- Tier: 1
- Returnability: Yes
- Warranty Period: 18 months
- Sustainable Packaging: No
- Mercury Free: Yes
- Packaging Without Single Use Plastic: No
- Reach Free Shvc: Yes
- Tier Id: 1
- ROHS Eur In Scope: Yes
- Recycled Metal Content At Cr Level: 0 %
- Legacy WEEE Scope: In
- Packaging Made With Recycled Cardboard: Yes
- China ROHS Label: 1
- Serviceability: No
- With Recycled Cardboard: Yes
- WEEE Product Category: 5
- Without Single Use Plastic: No
- Product Availability: Stock - Normally stocked in distribution facility
- ROHS Exemption Information: Yes
- Traceability: No
- Reach Free Of Svhc: Yes
Typical Applications
- Motor Control Circuits
- Industrial Contactor and Starter Assemblies
- Commercial Electrical Panel Building
- OEM Control Panel Manufacturing
- Auxiliary Signaling and Interlocking Circuits
Why Square D?
Square D Type S auxiliary contact blocks deliver a robust design and reliable build, with easy serviceability through replaceable parts. Backed by UL Listed, UL Recognized, and CSA certifications, this contact block provides code-compliant performance for demanding industrial and commercial motor control applications.
Manufacturer Resources
Product Specs
- Series:
- Type S
- Voltage Rating:
- 600V
- Department:
- Electrical
- Listing:
- UL Listed
- Connection Type:
- Screw Clamp
- Product Group:
- Motor Control & Automation
- Product Type:
- Auxiliary Contact
- Product Subgroup:
- Contactors & Relays
Square D 9999SX7 – Frequently Asked Questions
1) Will a Square D Type S auxiliary contact block mount on my NEMA Size 1 motor starter?
Yes. The Type S auxiliary contact block is made for SA-SJ Type S contactors and starters covering NEMA Sizes 00 through 7, so a Size 1 Type S starter is within range. It is an external, field-convertible block that mounts to the side of the contactor or starter, so you can add it after the panel is already built rather than swapping the starter.
2) Which contact arrangement should I order for a Square D Type S auxiliary contact block?
Three arrangements are offered: 1 NO (part 9999SX11), 1 NC (9999SX7), and 1 NO/1 NC isolated (9999SX8). Use a normally open contact for a seal-in or run indication, normally closed for an interlock that must drop out when the starter pulls in, and the 1 NO/1 NC isolated block when you need both and the two circuits must stay electrically separate.
3) Can I use this Square D auxiliary contact on a 480V control circuit?
The Type S auxiliary contact block carries a rated operational voltage of up to 600 V AC at 50/60 Hz, so 480 V control is within the rating. Note the switching capability is separate: breaking capacity is 6 A at 120 V AC on an inductive control circuit per UL 508, so size your coil or relay load accordingly.
4) What else could I use if my starter is not a Square D Type S?
The Type S block only fits SA-SJ Type S contactors and starters, so it will not mount on another manufacturer's starter. For an ABB manual motor protector, the ABB HK1-11 is a side-mount 1NO/1NC auxiliary contact for the MS116/132 range. For ABB 460 Line lighting contactors, the CR460XB2 is a 2-pole auxiliary contact block accessory. Auxiliary blocks are brand and series specific; match the block to the device you actually have.
5) Is the ABB HK1-11 auxiliary contact a substitute for a Square D 9999SX8?
Both are side-mount auxiliary contacts with a 1NO/1NC arrangement, but they belong to different device families and are not interchangeable. The Square D 9999SX8 is a Type S auxiliary contact block built to mount on SA-SJ Type S contactors and starters across NEMA Sizes 00 through 7, rated <= 600 V AC with screw clamp terminals. The ABB HK1-11 is a side-mount auxiliary contact for ABB MS116/132 manual motor protectors. Match the contact block to the base device you already have in the panel: a Type S starter takes the 9999SX, an MS116 or MS132 breaker takes the HK1-11.
6) Is the Square D Type S auxiliary contact block UL listed for a control panel build?
It is UL Listed, UL Recognized, and CSA certified, with the breaking capacity rated per UL 508. That covers the usual requirements for industrial and commercial motor control panel work by OEMs and panel builders.
7) What is the difference between a 1 NO/1 NC isolated auxiliary contact and a standard one?
Isolated means the normally open and normally closed contacts do not share a common terminal, so each one can sit in a separate circuit at a different potential, for example one feeding a PLC input and the other switching a pilot light on a different supply. A non-isolated pair shares a common and has to stay on the same circuit. The Square D 9999SX8 is the isolated 1 NO/1 NC version; 9999SX11 and 9999SX7 are single contacts.
8) I only need one contact for a run indicator light - do I have to buy the 1 NO/1 NC block?
No. The Square D Type S auxiliary contact block is offered as a single 1 NO (9999SX11), a single 1 NC (9999SX7), or a combined 1 NO/1 NC (9999SX8). For a single run-indicator pilot light you only need the 1 NO version. All three mount externally to the side of a Type S contactor or starter and use screw clamp terminals, so the wiring method is the same whichever arrangement you pick.
9) What auxiliary contact do I use on a lighting contactor rather than a Type S motor starter?
The Square D Type S auxiliary contact block is specified for SA-SJ Type S magnetic contactors and starters used in motor control, so it is not the part for an ABB lighting contactor. For that application the ABB CR460XB2 is a 2-pole auxiliary contact block sold as a 460 Line lighting contactor accessory. Confirm which contactor line is actually in the enclosure before ordering, since auxiliary blocks are keyed to their own contactor family.
10) What kind of terminals does this contact block use, and do I need ferrules?
Wiring lands on screw clamp terminals, so stranded control wire can be landed directly under the clamp without a ring terminal. Screw clamp also means the block can be rewired in the field with a screwdriver, no special crimp tooling.
11) I need two extra normally open contacts on one starter - can I use two blocks or should I look at a different brand?
Staying within the family is the cleaner path: the Square D Type S auxiliary contact block is an external field-convertible add-on that mounts to the side of the contactor or starter, and the 1 NO version is MPN 9999SX11, so the same base device can carry the arrangement you need without changing brands. If the panel is built on ABB instead, the equivalent side-mount part is the HK1-11 for MS116/132 devices, which is a fixed 1NO/1NC arrangement rather than a single-contact option.
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D 9999SX7 come with a warranty?
Absolutely. The Square D 9999SX7 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 9999SX7?
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