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Square D
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Square D ComPact NSXm Auxiliary Contact, OF/SD Circuit Breaker Status
The Square D standard auxiliary contact is a single OF/SD signaling contact used on ComPact NSXm and PowerPact B circuit breakers to provide remote indication of breaker status. The OF contact reports the open/closed position of the main contacts, while the SD contact signals a trip event caused by overload or short-circuit conditions. Rated Ie 5 A at 24/48 V AC 50/60 Hz (AC-12) with a minimum load of 2 mA at 17 V DC, and an Ith conventional free air thermal current of 5 A, this contact delivers reliable local ON/OFF and trip indication for panel builders, electricians, and system integrators working on commercial and industrial installations.
Key Features
- Signal Composition: 1 NO/NC changeover contact configuration for flexible remote wiring.
- Range Compatibility: Designed for ComPact NSXm and PowerPact B circuit breaker ranges.
- Local Signalling: ON/OFF indication for open/close position plus trip indicator for relay trip status.
- Fault Detection: Signals trip events caused by overload or short-circuit faults.
- Electrical Rating: Ie AC-12: 5 A at 48 V AC and 5 A at 24 V AC, 50/60 Hz; minimum load 2 mA at 17 V DC.
- Thermal Current: Ith conventional free air thermal current of 5 A.
- Connection Type: Spring-type auxiliary connection terminal with an 8 mm wire stripping length for front connection.
Technical Specifications
- Toxic Heavy Metal Free: Yes
- Sustainable Packaging: No
- Mercury Free: Yes
- Packaging Without Single Use Plastic: No
- ROHS Eur In Scope: Yes
- Recycled Metal Content At Cr Level: 0 %
- Serviceability: No
- With Recycled Cardboard: Yes
- WEEE Scope: In
- China ROHS In Scope: No
- Returnability: Yes
- Ith Conventional Free Air Thermal Current: 5 A
- Green Premium Status For Reporting: Green Premium product
Typical Applications
- Commercial and Industrial Electrical Installations
- Remote Circuit Breaker Status Monitoring
- Panelboard and Control Panel Wiring
- OEM and Control Panelbuilder Assemblies
- Overload and Short-Circuit Trip Signaling
Why Square D?
Square D auxiliary contacts are engineered for precise compatibility with ComPact NSXm and PowerPact B circuit breakers, giving panel builders and electricians dependable remote status signaling for overload and short-circuit conditions. With ROHS-compliant, mercury-free, and toxic-heavy-metal-free construction, this Green Premium product supports code-compliant, reliable performance in professional commercial and industrial electrical systems.
Manufacturer Resources
Product Specs
- Product Type:
- Shunt Trip & Auxiliary Contact
- Connection Type:
- Spring
- Amperage Rating:
- 5A
- Series:
- ComPact NSXm
- Listing:
- ROHS Compliant
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Circuit Breakers
Square D LV426950 – Frequently Asked Questions
1) I need an auxiliary contact for a contactor or a rotary disconnect, not a breaker. What should I look at instead?
The LV426950 only mounts in ComPact NSXm and PowerPact B breakers, so for other gear you need a different family. For NEMA contactors and starters there's the Eaton Freedom Series top-mount auxiliary contact, and for IEC manual motor protectors the Eaton XT auxiliary contact. On rotary disconnect switches, Eaton's R9 Series auxiliary contact is rated 600V, and ABB's OA1G10 is a 1-NO auxiliary switch for OT/OS disconnects. For control relays, ABB's CR305X series adds contacts to relays and contactors.
2) Will the Square D LV426950 tell me whether a breaker tripped or was turned off manually?
Yes, and that's the point of the OF/SD pairing. A manual switch to OFF shows on the OF position contact only. A trip from overload or short circuit drives the SD signal as well, so the monitoring system or annunciator can distinguish a fault trip from an operator opening the breaker. There is also local ON/OFF indication plus a trip indicator at the breaker itself.
3) Can an Eaton XT or Freedom series auxiliary contact be used in place of the Square D LV426950 on a ComPact NSXm breaker?
No. The LV426950 is a standard OF/SD signaling contact built specifically for the ComPact NSXm and PowerPact B circuit breaker ranges, where it mounts into the breaker's auxiliary cavity and reports main contact position plus trip status. The Eaton XT auxiliary contact is made for manual motor protectors and the Eaton Freedom series contact is a NEMA top-mount unit for Freedom contactors and starters. Those are different mounting interfaces on different devices, so neither drops into an NSXm breaker. If the device in the panel is an NSXm or PowerPact B breaker, the LV426950 is the part that fits it.
4) I need auxiliary status contacts on a rotary disconnect switch, not a molded case breaker. What should I use?
For a rotary or fused disconnect, look at a contact built for that device rather than the Square D LV426950, which is designed for ComPact NSXm and PowerPact B circuit breakers. The Eaton R9 series auxiliary contact is made for rotary disconnect switches and is rated 600V, and the ABB OA1G10 is a 1-NO auxiliary contact switch for OT and OS disconnects. Both attach to the disconnect mechanism itself. Choose the LV426950 only when the device being signaled is an NSXm or PowerPact B breaker and you need OF position plus SD trip indication.
5) Is the Square D LV426950 auxiliary contact a normally open or normally closed contact?
It's a changeover. The signal composition is 1 NO/NC changeover contact, so you wire whichever state suits the PLC input or indicator lamp you are feeding without ordering a different part.
6) How much current can I put through this Square D auxiliary contact continuously?
Ith, the conventional free air thermal current, is 5 A, and the switching rating is likewise 5 A. Treat 5 A as the ceiling for indicator lamps, relay coils, or interposing relays wired off the OF/SD contact.
7) Do I need ferrules or screw terminals to land wire on the Square D LV426950?
No screwdriver torque spec to worry about. The auxiliary connection is a spring-type terminal accessed from the front of the breaker, and the specified wire stripping length is 8 mm. Strip to that length and push in.
8) My panel needs more than 5 A switched off the breaker status signal. What do I do?
Don't run the load directly. The OF/SD contact tops out at 5 A thermal and 5 A AC-12, so anything heavier gets an interposing relay: land the LV426950 contact on the relay coil inside the 5 A limit and switch the real load through the relay. If you need a higher-current auxiliary in a different application, the Bussmann BAC series covers a 1A to 12A range.
9) Is the Bussmann BAC auxiliary contact an equivalent to the Square D LV426950?
They are not interchangeable. The Bussmann BAC series is an auxiliary contact covering a 1A to 12A amp range, used with Bussmann disconnect and fuse holder products. The Square D LV426950 is rated Ie 5 A at 24 and 48 V AC under AC-12 with a 5 A Ith free air thermal current, and it is dimensioned for the auxiliary pocket of ComPact NSXm and PowerPact B breakers. The BAC would be the consideration on a fused disconnect assembly; the LV426950 is the one that lands in the breaker.
10) What is the difference between the Square D LV426950 and a contactor auxiliary contact like the ABB CR305X?
They signal different classes of device. The LV426950 is a breaker status contact: the OF element reports whether the breaker main contacts are open or closed and the SD element signals a trip from an overload or short circuit, with a 1 NO/NC changeover composition. The ABB CR305X series contact is an auxiliary block for contactors and relays, where it simply follows the coil state of the contactor and has no trip-signaling role. If your monitoring scheme has to distinguish a manual open from a fault trip, that is what the OF/SD arrangement gives you.
11) Is the Square D NSXm auxiliary contact field-replaceable if it fails?
Serviceability is listed as No, so the contact is not a repairable assembly. If it fails, it gets swapped out as a unit rather than rebuilt.
12) Does the Square D LV426950 auxiliary contact meet RoHS requirements for a spec submittal?
It is RoHS compliant and RoHS EUR in scope, mercury free and free of toxic heavy metals, and carries Green Premium product status in Square D's reporting. It is in WEEE scope and China RoHS is listed as not in scope.
13) Which auxiliary contact wires fastest in a crowded control panel?
The Square D LV426950 uses a spring-type auxiliary terminal with an 8 mm strip length and front connection, so the conductor lands without a screwdriver torque step and stays accessible from the panel face. Among the alternatives, the Eaton Freedom contact is a top-mount block on the contactor and the ABB OA1G10 mounts to OT and OS disconnect switches, both of which put the terminals wherever the host device sits. If wiring access from the front of an NSXm breaker is the constraint, the spring front connection on the LV426950 is the relevant detail.
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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 LV426950 come with a warranty?
Absolutely. The Square D LV426950 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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