Key Technical Specifications

• Product Model: TRICONEX 8305A
• Manufacturer: TRICONEX (Schneider Electric)
• System Compatibility: Tricon ESD / Tricon Safety System
• Input Voltage: 115V AC or 120V AC/DC
• Module Type: Expansion / RXM Rack Power Supply
• Place of Origin: United States
• Warranty: 12 Months
• Availability: In Stock (Quantity limited)
• Shipping Port: Xiamen, China

 

Product Introduction

Power supplies in a safety instrumented system (SIS) are the most critical single points of failure, and the Triconex 8305A has been keeping refineries and chemical plants alive for decades. I’ve pulled this exact module out of cabinets covered in ten years of hydrocarbon dust, and as long as the input voltage is clean, it just keeps pushing DC power to the RXM expansion racks without complaining. It is a dedicated power supply specifically designed for the expansion or RXM racks, ensuring that your redundant I/O modules actually have the juice they need to execute safety logic.Engineers stick with this specific Triconex power supply because the TMR architecture demands absolute isolation between the main chassis and the expansion chassis. With a standard 115VAC/DC input, it handles the typical industrial control voltage swings without dropping the bus. I will give you one honest warning from the field, though: these older power supplies are notoriously picky about grounding. If your cabinet ground loop is floating or noisy, the 8305A will tell you about it, but otherwise, it is a bulletproof workhorse.

Quality SOP & Tech Pitfalls

• The Lab Report (SOP): We don’t just wipe the dust off and ship it. Every 8305A goes through a strict protocol: visual counterfeit check, live test on a Tricon test rack to verify output voltage under load, insulation resistance checks with a Fluke 115, firmware/hardware revision logging, and finally, anti-static sealing.
• The Engineer’s Warning (Pitfalls): The biggest mistake I see guys make is swapping this power supply while the expansion rack is still energized, or worse, failing to photograph the DIP switch settings before pulling the old one. I once watched a technician spend six hours troubleshooting a “faulty” 8305A replacement, only to realize he left the input voltage selector jumper in the wrong position for his 120VDC supply. Always copy your jumper settings. Always.

 

Installation & Configuration Guide

1. Pre-Installation: ⚠️ SAFETY FIRST. Lock out and tag out the 115VAC/DC input power to the expansion rack. Wait at least 5 minutes for internal capacitors to discharge. Take a high-resolution photo of the old 8305A, specifically focusing on all DIP switches, jumpers, and wire terminations.
2. Removal: Label every single wire before disconnecting. Release the DIN rail clips or remove the mounting screws safely. Do not yank the module; these old connectors can crack if forced.
3. Installation: CRITICAL STEP: Copy the DIP/Jumper settings from the old module to the new 8305A exactly. This prevents 90% of startup failures and bus faults. Seat the module firmly into the rack and secure the mounting hardware.
4. Power-On & Testing: Re-energize the 115VAC/DC input. Verify the 24V DC output LEDs illuminate in the correct boot sequence. Check the Tricon processor diagnostics to ensure the expansion rack is communicating properly and no power supply faults are logged.

Compatible Replacement Models

• ✅ Drop-in Replacement: TRICONEX 8305 (Base model). 100% hardware and software match. The 8305A is simply a specific revision; the base 8305 will function identically in the RXM rack.
• ⚠️ Software Compatible: TRICONEX 8310 / 8311. Same physical footprint, but requires verifying firmware compatibility with your main chassis controller. Expect 1-2 hours of engineering time to recompile and download logic if a firmware handshake fails.
• ❌ Hardware Mod Required: TRICONEX 8312. Requires rewiring or new chassis backplane modifications. Explicitly advise against using this unless you are doing a full system migration to a newer Tricon platform.

 

Frequently Asked Questions (FAQ)

• Can I hot-swap this power supply safely?
  No. Triconex expansion power supplies are not designed for hot-swapping under load. Pulling it while energized can arc the backplane connectors and fry the RXM rack. Kill the power first.
• Is the 8305A a direct replacement for the older 8300A?
  Generally, yes, but you must verify the input voltage rating. The 8300A had different input variants. Check your OEM manual for the exact expansion rack requirements before ordering.
• I installed it, but the expansion rack is showing a fault. What gives?
  9 times out of 10, it’s a jumper setting. Did you copy the DIP switches from the old board? If yes, check your 115VAC input wiring. A loose neutral or ground on the input side will cause the 8305A to brown out under load.
• Are these brand new or refurbished?
  We deal in New Surplus and original OEM stock. Because this is an obsolete Triconex part, true “factory sealed” units are rare. We guarantee 100% original equipment, fully tested on a live rack, and backed by a 1-year warranty.
• Will this work with a standard 120VDC supply?
  Yes. The 8305A is rated for 120V AC/DC. Just make sure your jumper is set to the DC position, otherwise, the internal rectifier will get very hot, very fast.
• How fast can you get this to my plant?
  We have stock on hand. Lead time is 1-2 working days from Xiamen via DHL, UPS, or FedEx. If your SIS is down, tell us, and we will expedite the shipping.