Eaton RELAY-MS

Overview

The Eaton RELAY-MS is a mini-slot interface card designed to enhance the connectivity and control of Eaton UPS systems, specifically the 5PX G2, 9SX, and 9PX Lithium-ion models. It provides both dry contact and RS-232 serial communication via a DB9 connector, allowing seamless integration with relay-based devices for automatic shutdowns and real-time monitoring. This compact card installs easily without requiring a UPS shutdown or restart, making it ideal for environments where continuous operation is essential.

Key features

• Supports both dry contact and DB9 RS-232 serial interfaces for versatile communication options
• Enables automatic shutdown of connected equipment to protect hardware during power events
• Facilitates remote monitoring and control of UPS status through relay-based devices
• Installation can be performed without interrupting UPS operation, ensuring uptime
• Compact design fits neatly into the UPS mini-slot, saving space in server rooms or data centers
• Operates reliably within a temperature range of 0°C to 40°C (32°F to 104°F)
• Backed by a 2-year limited warranty for peace of mind

Key specs

• Compatible UPS models: Eaton 5PX G2, 9SX, and 9PX Lithium-ion
• Communication interfaces: Dry contact and RS-232 serial via DB9 connector
• Dimensions: 1.96 x 9.44 x 5.9 inches
• Operating temperature: 0°C to 40°C (32°F to 104°F)
• Warranty: 2-year limited

Connectivity and compatibility

This mini-slot card connects directly to Eaton UPS systems, providing a DB9 serial port for RS-232 communication and dry contact relay outputs. These interfaces allow it to integrate with alarm systems, building management systems, or other relay-based equipment that require UPS status signals or control commands. Its compatibility with multiple Eaton UPS models ensures flexibility for various setups.

Installation and setup

Installing the RELAY-MS card is straightforward and designed to be done without powering down or restarting the UPS. This feature minimizes downtime and disruption, which is critical in environments like data centers or server rooms where continuous power protection is necessary. The card’s compact form factor fits into the designated mini-slot, making installation quick and clean.

Ideal uses and environments

The RELAY-MS is well suited for IT professionals and facilities managers who need to extend the functionality of their Eaton UPS systems. It works effectively in data centers, server rooms, and critical infrastructure environments where automatic shutdowns and real-time monitoring help prevent hardware damage and maintain uptime. Its robust design and reliable communication options make it a strong choice for setups requiring precise power event management and integration with external control systems.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

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Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, with tags, manuals, accessories, and original, unaltered packaging. Any item kept will be deducted from the refund. Start a return by sending us an email. Items sent back without approval may be refused or returned to the sender.

Some items are not returnable: opened TVs/combos/monitors 37″+, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method; allow 5–7 business days for the credit to post. Shipping, handling, customs duties, and import taxes are nonrefundable. If an item is used, incomplete, or not in original condition, a 30% restocking fee may apply. Direct exchanges are not offered; purchase the replacement and return the original for a refund.

We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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