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Square D Motor Logic Solid State Overload Relay, Isolated Alarm Contact
Model: SQU-9999AC04
Square D Motor Logic Solid State Overload Relay, Isolated Alarm ContactThe Square D Motor Logic solid state overload relay isolated alarm contact is designed for use with Motor Logic overload relays...
Square D
$79.97
Square D Type S Isolated Alarm Contact Kit for Melting Alloy Overload Relays
The Square D Type S Isolated Alarm Contact Kit delivers an isolated overload relay alarm contact for Type S magnetic contactors and starters. Compatible with melting alloy overload relays used on Type S units, it is available factory installed or as a field-installation kit, rated for 600 V AC operational voltage.
Key Features
- Isolated Alarm Contact: Delivers an isolated overload relay alarm contact, available factory installed or as a kit for field installation.
- Melting Alloy Compatibility: Works with melting alloy overload relays used on Type S contactors and starters.
- Standard Installation: Comes standard installed on non-reversing, reversing, combination, and multispeed starters.
- Simple Installation: Straightforward field installation.
- Field Interchangeable Thermal Units: Supports replacement motor installations.
- Mounting Flexibility: Available as direct mount or separate mount.
- Thermal Protection: Provides thermal protection for the most costly equipment.
- Voltage Rating: 600 V AC rated operational voltage (Ue).
- Contact Configuration: 1 NO contact type and composition.
Certifications & Compliance
- RoHS Eur Compliant with Exemptions
- Mercury Free Construction
- California Proposition 65 Warning Applies (Lead and Lead Compounds)
Technical Specifications
- Warranty: 18 months
- Take Back: No
- Tier: 1
- Returnability: Yes
- Warranty Period: 18 months
- Return Indicator: Y
- Sustainable Packaging: No
- Mercury Free: Yes
- Packaging Without Single Use Plastic: No
- 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
- With Recycled Cardboard: Yes
- Without Single Use Plastic: No
- ROHS Exemption Information: Yes
- Relationshiptype: Compatible relationship
- Product Or Component Type: auxiliary contact
- China ROHS In Scope: No
- Scope Perimeter: At least in Europe
- WEEE Product Category: 5
- Product Contributes To Saved And Avoided Emissions: No
Typical Applications
- Industrial Motor Control Panels
- Commercial and Industrial Electrical Installations
- Non-Reversing, Reversing, Combination, and Multispeed Starters
- Replacement Motor Installations
- Panel Building and OEM Applications
Why Square D?
Square D backs this kit with an 18-month warranty and RoHS-compliant, mercury-free construction. Field interchangeable thermal units and flexible direct or separate mounting support dependable, code-compliant performance for professional motor control installations.
Manufacturer Resources
Product Specs
- Product Type:
- Auxiliary Contact
- Series:
- Type S
- Voltage Rating:
- 600V
- Department:
- Electrical
- Product Group:
- Motor Control & Automation
- Product Subgroup:
- Contactors & Relays
Square D 9999SO4 – Frequently Asked Questions
1) What does an isolated alarm contact on an overload relay actually do for me?
It gives you a separate, electrically isolated contact that changes state when the overload relay trips, so you can wire a remote alarm, pilot light, or PLC input on its own circuit without tying into the starter control wiring. The 9999SO4 provides one normally open (1 NO) contact for that purpose.
2) Can I add the Square D 9999SO4 to a starter already in the panel, or does it have to be factory installed?
Either way. The isolated alarm contact is offered factory installed on Type S units or as the 9999SO4 field-installation kit for starters already in service, so retrofitting an existing panel is the intended use.
3) I need a normally closed alarm contact, not normally open. Will this one work?
No. The Square D 9999SO4 kit supplies a single normally open contact only. If your alarm scheme needs a NC contact, or needs both, look at an auxiliary contact block that offers that configuration, such as the ABB HK1-11 side-mount contact, which is 1NO/1NC.
4) What is the closest alternative to the Square D 9999SO4 alarm contact kit if the starter is not a Type S?
The 9999SO4 is built specifically for melting alloy overload relays on Square D Type S magnetic contactors and starters, so it does not transfer to another manufacturer's starter. For Eaton NEMA starters, the Eaton Freedom series top-mount auxiliary contact is the equivalent add-on, and the Eaton auxiliary contact kit rated 2NO at 10A, 600V is the kit-style option. Match the accessory to the starter line it was designed for rather than by contact count alone.
5) I need two normally open auxiliary contacts, not one. What should I look at instead of the 9999SO4?
The Square D 9999SO4 provides a single NO isolated alarm contact. If the control scheme needs two NO contacts, the Eaton auxiliary contact kit is specified as 2NO rated 10A at 600V, and the Eaton AR/ARD machine tool relay four-pole top deck adder is also a 2NO configuration. Both are tied to their own Eaton platforms, so confirm the host device before ordering.
6) What voltage can I switch through this Square D alarm contact?
Rated operational voltage is 600 V AC, which covers 120 V and 240 V control circuits as well as 480 V and 600 V industrial control power.
7) What is the difference between this overload alarm contact and a regular auxiliary contact block on a contactor?
They monitor two different things. The Square D 9999SO4 reports the overload relay condition, so it tells you the starter tripped on thermal overload. A standard auxiliary contact block, such as the Eaton Freedom Series top-mount auxiliary contact or the Eaton C320DPG20 kit (2NO, 10A at 600V), follows the contactor coil and only tells you whether the contactor is energized. If you want trip indication, you need the alarm contact; if you want run status, you need the auxiliary block.
8) My starter is not a Square D Type S. What auxiliary contact should I be looking at instead?
The 9999SO4 is specific to Square D Type S units and will not fit another line. Match the accessory to your device family: Eaton Freedom NEMA starters take the Freedom Series top-mount auxiliary contact, Eaton manual motor protectors take the XT auxiliary contact, ABB MS116/132 manual motor starters take the HK1-11 side-mount, and ABB OT/OS disconnects take the OA1G10 1-NO contact switch.
9) Is the ABB HK1-11 a substitute for the Square D 9999SO4?
No. The ABB HK1-11 is a side-mount auxiliary contact with a 1NO/1NC arrangement for ABB MS116 and MS132 manual motor protectors. The Square D 9999SO4 is a 1 NO isolated alarm contact for melting alloy overload relays on Type S contactors and starters. Different host device and different contact arrangement, so they are not interchangeable.
10) Can the Square D 9999SO4 be used on a lighting contactor?
The 9999SO4 is intended for Type S magnetic contactors and starters with melting alloy overload relays, which are motor control devices. For lighting contactor auxiliary contacts, the ABB CR460XB2 is a 2-pole auxiliary contact block built as a 460 Line lighting contactor accessory. The ABB CR305X series auxiliary contact covers CR305X contactors and relays.
11) Does the overload relay still allow thermal unit changes after I add the alarm contact?
Yes. Type S melting alloy overloads use field interchangeable thermal units, so you can resize the heaters when a replacement motor goes in without disturbing the alarm contact arrangement.
12) Can this alarm contact be used on a separately mounted overload relay, not just one bolted to the contactor?
Yes, it covers both arrangements. The Type S overload relay is offered in direct mount and separate mount versions, and the isolated alarm contact is available for the Type S line either way.
13) Is this Square D kit RoHS compliant and mercury free for our facility's procurement specs?
It is RoHS European compliant with exemptions and of mercury free construction. A California Proposition 65 warning applies for lead and lead compounds. Country of origin is Mexico.
14) Which auxiliary contact options share the 600V rating of the Square D 9999SO4?
The Square D 9999SO4 carries a 600V AC rated operational voltage. Among alternatives, the Eaton auxiliary contact kit is rated 10A at 600V. The two differ in contact count, since the 9999SO4 supplies 1 NO as an isolated overload alarm contact while the Eaton kit is 2NO, and each mounts to its own manufacturer's starter line.
How fast can I get the Square D 9999SO4 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 9999SO4 come with a warranty?
Absolutely. The Square D 9999SO4 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 9999SO4?
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