TRICONEX 3625N Power Supply Module

Technical Dossier

Product Details And Specifications

TRICONEX Tricon Series Technical Notes

The TRICONEX Tricon platform is a Triple Modular Redundant (TMR) safety-rated distributed control system deployed across the global heavy process industry. Installations span petrochemical complexes, nuclear power stations, offshore platforms, LNG terminals, and crude oil refineries. The architecture's fault-tolerant design — three independent processing legs with continuous cross-comparison — qualifies it for IEC 61511 SIL 3 applications. The 3625N is a DC power supply module within this platform, providing regulated power to the Tricon main chassis backplane. Its role is foundational: without a functioning power supply, no I/O, CPU, or communication module in the chassis can operate.

The Evolution of Tricon Architecture

The Triconex Tricon system was introduced in the mid-1980s as one of the first commercially available TMR programmable safety controllers. Early hardware generations (v1–v4 chassis) used proprietary backplane buses and dedicated power rails incompatible with later revisions. The transition to the Enhanced Tricon Controller (ETC) in the late 1990s introduced the 3008 main processor and a revised power distribution scheme, of which the 3625N is a direct component. The subsequent Tricon CX generation (circa 2010) retained backward compatibility with select legacy I/O modules but introduced a new communication infrastructure. As of 2026, the Tricon platform is in a mature/extended-lifecycle phase: Schneider Electric (which acquired Invensys/Triconex) continues to supply spare parts and firmware support, but new greenfield deployments increasingly migrate to the Tricon CX or Triconex v10 architecture. For plants running legacy Tricon hardware, long-term maintenance sourcing from specialist distributors such as DriveKNMS is the primary strategy for sustaining SIL-rated loop integrity without full system replacement.

Tricon Full Catalog & Functionalities (SKU List)

Power Supply Modules

• 3625N: DC input power supply module for Tricon main chassis; provides regulated backplane power with TMR redundancy support.
• 3624: AC input power supply module; 115/230 VAC input, dual-redundant output rails for Tricon chassis.
• 3626: Enhanced DC power supply; extended input voltage range for harsh-environment installations.

Main Processor / CPU Modules

• 3008: Enhanced Tricon Controller (ETC) main processor; executes TriStation-compiled safety logic at up to 10 ms scan rates.
• 3006: Legacy Tricon main processor (pre-ETC); limited to older chassis revisions, no longer manufactured.
• 3007: Tricon processor module, intermediate generation; compatible with v4–v7 chassis backplanes.

Digital Input (DI) Modules

• 3501E: 32-channel 24 VDC digital input module; field-side isolated, TMR voting logic.
• 3503E: 32-channel 120 VAC digital input module; used in high-voltage field device interfaces.
• 3504E: 32-channel 24 VDC digital input, enhanced diagnostics version.

Digital Output (DO) Modules

• 3601E: 16-channel 24 VDC digital output module; solid-state relay outputs, SIL 3 rated.
• 3603E: 16-channel 120 VAC digital output module; triac-based switching for AC field devices.
• 3607E: 32-channel 24 VDC digital output, high-density configuration.

Analog Input (AI) Modules

• 3703E: 16-channel 4–20 mA analog input module; 12-bit resolution, HART-transparent.
• 3706A: 8-channel thermocouple/RTD analog input; multi-sensor type support.
• 3708E: 16-channel analog input, enhanced version with extended diagnostics and HART pass-through.

Communication / Adapter Modules

• 4351B: Tricon Communication Module (TCM); supports Modbus TCP, OPC, and peer-to-peer Triconex links.
• 4119A: Remote I/O adapter module; extends Tricon I/O over fiber-optic TSAA bus to remote chassis.
• 4100: Tricon network interface module; legacy peer-to-peer communication for multi-chassis safety systems.