--- title: Firmware Upgrade Littelfuse SE-330 Neutral Grounding Resistor Monitor description: Littelfuse SE-330 Registration and Firmware upgrade. Keep your Littelfuse SE-330 Neutral Grounding Resistor Monitor up to date. --- [![Littelfuse - Expertise Applied - Answers Delivered](https://info.littelfuse.com/hs-fs/hubfs/Littelfuse%20Logo.png?width=201&height=47&name=Littelfuse%20Logo.png "Littelfuse - Expertise Applied - Answers Delivered")](https://www.littelfuse.com/) [CROSS REFERENCE](https://www.littelfuse.com/crossreference) [CHECK DISTRIBUTOR STOCK](https://www.littelfuse.com/checkstock) [WHERE TO BUY](https://www.littelfuse.com/wheretobuy) [REQUEST SAMPLE](https://www.littelfuse.com/request-sample) [Products](https://www.littelfuse.com/products) [Applications](https://www.littelfuse.com/applications) [Design Center](https://www.littelfuse.com/design-center) [Company](https://www.littelfuse.com/company) [Support](https://www.littelfuse.com/support) ![SE-330-PCN-Header-3](https://info.littelfuse.com/hs-fs/hubfs/Electrical/Industrial/Landing_Pages/Banners/SE-330-PCN-Header-3.jpg?width=970&name=SE-330-PCN-Header-3.jpg) # Firmware Update Registration for SE-330, SE-330AU, SE-330HV Welcome to the Littelfuse SE-330 Family firmware update page. Please take a moment to fill in this registration form with contact information for the person responsible for maintenance of protection relays and/or electrical equipment at your facility. Your registration allows Littelfuse to contact you directly in the future for critical updates, notifications, and feature enhancements to the SE-330 product line and other relevant messages. Information about specific firmware updates is in the Firmware Revision History section of the SE-330 product manual and firmware release notes files. Supporting files are found in the Resources section of the SE-330 Series webpage. For any additional questions, please contact our technical support team at [relays@littelfuse.com](mailto:relays@littelfuse.com) [![SE-330 Series Page](https://no-cache.hubspot.com/cta/default/455238/77c971b1-8aa9-4941-a27c-2a87ef592d7d.png)](https://cta-redirect.hubspot.com/cta/redirect/455238/77c971b1-8aa9-4941-a27c-2a87ef592d7d) [Data Privacy & Communications](https://www.littelfuse.com/data-privacy-and-communications) | [Website Terms of Use](https://www.littelfuse.com/legal/website-terms-of-use) | [Product Disclaimer](https://www.littelfuse.com/legal/product-disclaimer) Littelfuse, Inc. 6133 North River Road, Suite 500, Rosemont, IL 60018 USA, 773-628-1000 Copyright © 2026 Littelfuse, Inc.