Square D MD Auxiliary Contact ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$149.59
Square D MD Auxiliary Contact Module, 1NO/1NC

Square D MD Auxiliary Contact Module, 1NO/1NC

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Model: MDSAN11

In Stock (leaves warehouse same day if ordered before 3pm ET)

$149.59
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Square D MD Auxiliary Contact Module, 1NO/1NC

The Square D MD auxiliary contact module adds a 1 N/O + 1 N/C auxiliary contact to MD-series motor disconnect switches such as the MD3304X and MD3604X, giving control panels and OEM assemblies a reliable signal for interlocking, indication, or remote monitoring. It is housed in a compact, water-tight NEMA 4X enclosure suitable for NEMA 1, 3, 3R, 4, 4X, and 12 applications, and it is UL 508 Listed as Suitable for Motor Control (UL File E164864) while conforming to IEC 60947-3. Built for commercial and industrial motor control work, this module is designed to install cleanly alongside compatible MD disconnect switches without added enclosure bulk.

Key Features

  • Contact Configuration: 1 N/O + 1 N/C auxiliary contact arrangement for interlocking, signaling, or remote status indication.
  • Compatible Fit: Designed for use with Square D MD-series motor disconnect switches, including the MD3304X and MD3604X.
  • Enclosure Rating: Water-tight NEMA 4X construction, suitable for NEMA 1, 3, 3R, 4, 4X, and 12 applications.
  • Standards Compliance: UL 508 Listed, Suitable for Motor Control (UL File E164864), and conforms to IEC 60947-3.
  • Horsepower Rated: Sized for horsepower-rated motor disconnect applications.
  • Lockout/Tagout Ready: OSHA lockout/tagout compatible for safe maintenance procedures.
  • Compact Design: Covers additional enclosure types without increasing overall footprint.

Certifications & Compliance

  • UL 508 Listed, Suitable for Motor Control (UL File E164864)
  • cULus Listed
  • Conforms to IEC 60947-3
  • NEMA 1, 3, 3R, 4, 4X, and 12 rated enclosure
  • RoHS EUR compliant (in scope)

Technical Specifications

  • Range Of Product: MD
  • Product Or Component Type: Auxiliary Contact Module
  • B2B Bullet Point 1: Water-tight NEMA 4X
  • Warranty Period: 18 months
  • Returnability: Yes
  • Toxic Heavy Metal Free: Yes
  • Mercury Free: Yes
  • ROHS Eur In Scope: Yes
  • ROHS Exemption Information: Yes
  • Reach Free Of Svhc: Yes
  • China ROHS Label: 1
  • Sustainable Packaging: No
  • Packaging Made With Recycled Cardboard: Yes
  • Recycled Metal Content At Cr Level: 0 %

Typical Applications

  • Motor Control Centers and Disconnect Panels
  • OEM Control Panel Building
  • Industrial Motor Disconnect Switch Retrofits
  • Interlocking and Auxiliary Signaling Circuits
  • Commercial and Industrial Electrical Installations

Why Square D?

Square D engineers the MD auxiliary contact module to the same UL 508 and IEC 60947-3 standards as its motor disconnect switches, so control panel builders and electricians can add auxiliary signaling without compromising the water-tight NEMA 4X protection of the enclosure. With cULus listing and OSHA lockout/tagout compatibility built in, this module supports code-compliant, dependable performance for professional motor control installations.

Manufacturer Resources

Product Specs

Product Type:
Auxiliary Contact
Configuration:
1NO + 1NC
Series:
MD
Listing:
cULus
Standards:
IEC 60947-3
Country of Origin:
China
Department:
Electrical
Product Group:
Motor Control & Automation
Product Subgroup:
Motor Starters & Contactors

Square D MDSAN11 – Frequently Asked Questions

1) Which Square D disconnect switches does the MDSAN11 auxiliary contact module fit?
The MDSAN11 is built for Square D MD-series motor disconnect switches, with the MD3304X and MD3604X called out specifically. It mounts alongside the switch without enlarging the enclosure footprint. It is not a contactor auxiliary block, so it won't mount on a starter or lighting contactor.
2) What contact arrangement do I get with the Square D MDSAN11 module?
One normally open and one normally closed contact (1NO + 1NC). That gives you a make contact and a break contact off the same disconnect handle position, which is what you want for interlocking, pilot light indication, or sending a run-permissive signal back to a PLC or control panel.
3) Can this auxiliary contact be used in a washdown or outdoor NEMA 4X disconnect?
Yes. The MD auxiliary contact module is housed in a water-tight NEMA 4X enclosure and is suitable for NEMA 1, 3, 3R, 4, 4X and 12 applications, so it keeps the rating of a washdown or outdoor motor disconnect intact rather than forcing you up to a larger enclosure.
4) Is the Square D MD auxiliary contact module UL listed for motor control panel work?
It is UL 508 Listed, Suitable for Motor Control, under UL File E164864, and it is cULus listed for both US and Canadian installations. It also conforms to IEC 60947-3, which matters for OEM machines being exported or built to an IEC panel spec.
5) I need an auxiliary contact on an existing motor disconnect, not a contactor. Which one do I buy?
For a Square D MD-series disconnect, the MDSAN11 is the matching module. If the disconnect is an ABB OT or OS switch instead, the ABB OA1G10 auxiliary contact switch is the one made for those. Contactor-mounted blocks like the Eaton Freedom series C320KG-SD top-mount auxiliary or the Eaton C320DPG20 kit will not mount on a disconnect, so don't substitute those.
6) Which auxiliary contact matches the Square D MDSAN11 1NO/1NC contact arrangement on another brand's manual motor protector?
The ABB HK1-11 is a side-mount auxiliary contact with the same 1NO/1NC arrangement as the Square D MDSAN11, but it is built for ABB MS116 and MS132 manual motor protectors. Eaton's equivalent for that duty is the XTPAXSA auxiliary contact for XT manual motor protectors. The Square D MDSAN11 is a module for MD-series motor disconnect switches, housed in a water-tight NEMA 4X enclosure, so the three are matched on contact configuration only, not on mounting.
7) What is the closest equivalent to the Square D MDSAN11 auxiliary contact if the disconnect switch is an ABB OT or OS rather than a Square D MD?
Use the ABB OA1G10 auxiliary contact switch, which is built for ABB OT/OS disconnects. The Square D MDSAN11 is designed for Square D MD-series motor disconnect switches such as the MD3304X and MD3604X, so it should not be ordered against an ABB disconnect. Note the contact count differs: the MDSAN11 carries a 1NO + 1NC arrangement, while the OA1G10 is a 1-NO device, so an interlock plus a status-indication circuit off one module is not a like-for-like swap.
8) We need two normally open auxiliary contacts rather than one NO and one NC. What should we use instead of the Square D MDSAN11?
The Square D MDSAN11 is fixed at a 1 N/O + 1 N/C arrangement, so it will not give you two independent NO circuits. For a 2NO configuration, the Eaton C320DPG20 auxiliary contact kit is rated 2NO, 10A at 600V, and the Eaton ARA20 top deck adder for AR/ARD machine tool relays is also a 2NO device. Both are Eaton-platform accessories, so confirm the host device before ordering.
9) Does adding this module affect lockout/tagout on the disconnect?
No. The MD auxiliary contact module is OSHA lockout/tagout compatible, so the disconnect handle can still be padlocked in the off position for maintenance after the module is fitted. It is also horsepower-rated application sized, matching the MD disconnects it attaches to.
10) Can a contactor auxiliary contact block be used in place of the Square D MDSAN11?
No. Contactor and relay accessories such as the ABB CR305X auxiliary contact, the ABB CR460XB2 2-pole auxiliary contact block for 460 Line lighting contactors, and the Eaton C320KG-SD Freedom Series top-mount auxiliary contact all mount to a coil-operated contactor or relay. The Square D MDSAN11 attaches to an MD-series motor disconnect switch, where it signals the position of a manually operated switch for interlocking, indication, or remote monitoring. The two groups are not interchangeable even where the contact counts look similar.
11) For a washdown or outdoor motor disconnect, is the Square D MDSAN11 the right auxiliary contact or should a panel-mount block be used?
The Square D MDSAN11 is the one to specify for a wet location: it is housed in a water-tight NEMA 4X enclosure suitable for NEMA 1, 3, 3R, 4, 4X, and 12 applications, and it adds that coverage without increasing the footprint. Peer accessories such as the Eaton C320KG-SD Freedom Series top-mount auxiliary contact and the ABB CR305X contact for contactors and relays are device-mounted blocks that rely on whatever enclosure the host equipment sits in, so in a washdown area they require a suitably rated enclosure around them.
12) Do I need two modules if I want two separate signals from one disconnect?
Each MDSAN11 module supplies one NO and one NC contact. If your sequence needs two independent make contacts, or a break plus two makes, you have to plan for more than a single module, since the arrangement on this one is fixed at 1NO + 1NC rather than selectable.
13) Is the Square D MDSAN11 RoHS and REACH compliant for our specification?
It is in scope for RoHS EUR and reported free of REACH SVHCs, with mercury-free and toxic heavy metal free declarations. Packaging uses recycled cardboard. Country of origin is China, which is usually the other line procurement needs on a submittal.
How fast can I get the Square D MDSAN11 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
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 MDSAN11 come with a warranty?
Absolutely. The Square D MDSAN11 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 MDSAN11?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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