Description
Triconex 2000418 — High-Integrity Trip Relay Module for Safety Instrumented Systems
The Triconex 2000418 is a dual-channel, fail-safe trip relay output module designed specifically for use in Triconex TMR (Triple Modular Redundant) safety systems—most commonly deployed in oil & gas refineries, chemical plants, and power generation facilities where SIL 3 compliance isn’t optional, it’s mandatory. From my experience supporting field engineers over the past decade, this module tends to show up in burner management systems (BMS), emergency shutdown (ESD) logic solvers, and turbine protection applications—places where a single point of failure could cascade into downtime or worse.
Key Features
- Dual independent trip outputs — Each channel drives a physically isolated relay with separate coil wiring and status feedback, enabling true 2oo3 voting compatibility within the Triconex architecture.
- Hardware-enforced de-energize-to-trip behavior — The relays are normally energized during safe operation; loss of power, module fault, or controller command causes immediate de-energization—a critical design choice that aligns with IEC 61511 requirements.
- Integrated diagnostics and self-test — Continuously monitors coil resistance, contact continuity, and driver circuit health. You might notice that diagnostic alarms appear early—often before contact wear becomes problematic—giving maintenance teams actionable lead time.
- TMR backplane compatibility — Plugs directly into Triconex 3000-series racks (e.g., 3009, 3012) without adapters. One thing I appreciate is how cleanly it integrates with TriStation 3.0 configuration files—no custom DTM or FDT needed.
- Field-wirable screw terminals — Accepts 12–24 AWG stranded or solid wire, with torque specs clearly marked on the terminal block. In many cases, this eliminates the need for pre-terminated harnesses during retrofit projects.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand / Model | Triconex 2000418 |
| HS Code | 8536.49.0090 (Relays for a voltage ≤ 1kV) |
| Power Requirements | Supplied via TMR backplane (24 VDC nominal); no external power input required |
| Dimensions & Weight | 127 mm × 127 mm × 229 mm (H×W×D); ~1.4 kg |
| Operating Temperature | 0 °C to +60 °C (derated above 45 °C for continuous operation) |
| Signal Output Type | 2 x Form-A (SPST-NO) electromechanical relays; rated 5 A @ 250 VAC / 30 VDC resistive |
| Feedback Input | 2 x dry-contact status inputs (relay closed = healthy) |
| Communication Interface | TMR serial bus only (no Ethernet or Modbus); diagnostics visible in TriStation 3.0 |
| Installation Method | DIN-rail mounted (EN 60715 TS35) inside Triconex-compatible cabinets; requires 2-slot footprint |
Application Fields
You’ll typically find the 2000418 installed in high-consequence loops: furnace safety shutoff valves, compressor anti-surge bypass controls, boiler drum level emergency drains, and gas turbine fire suppression triggers. It’s less common in batch or packaging lines—those usually lean on lower-cost, SIL 2-rated alternatives. A refinery in Texas recently replaced aging 2000212 modules with these and reported fewer nuisance trips during lightning season, likely due to improved noise immunity in the updated coil drive circuitry.
Advantages & Value
Procurement teams tend to value three things here: predictable lifecycle support, minimal integration friction, and audit-ready traceability. Because it’s a legacy-but-still-supported Triconex part (not obsolete, not end-of-life), spare availability remains strong—and firmware revisions are fully documented in Schneider’s public engineering bulletins. Unlike some third-party relay modules, it doesn’t require revalidation every time you patch TriStation. And while it’s not the cheapest relay module on the market, customers tell us the reduction in loop validation effort often offsets the unit cost within 6–8 months.
Installation & Maintenance
- Environment: Install only in NEMA 12 or higher cabinets with internal temperature controlled to ≤60 °C; avoid locations near VFDs or large contactors unless shielded conduit is used for all field wiring.
- Safety: Always isolate the TMR rack power and verify zero energy before insertion/removal—even though hot-swap capable, unexpected transients can corrupt vote logic.
- Maintenance: No scheduled calibration, but we recommend verifying contact resistance annually using a low-resistance ohmmeter (<50 mΩ typical when new). Clean dust from heatsinks every 18 months if ambient contains hydrocarbon vapors or fine particulates.
- Firmware: Updates are infrequent (last issued Q3 2022), and always bundled with TriStation patches—never applied standalone.
Quality & Certifications
Certified to SIL 3 per IEC 61508:2010 (TÜV Rheinland Certificate No. 99 000 02357), and compliant with ATEX II 2G Ex ia IIC T4 Ga and IECEx UL 20.0003X for hazardous area use. Also carries CE, UL 508A, and RoHS 3 (2015/863/EU) marks. Backed by a standard 365-day warranty—same as all Triconex hardware we supply. If you’re ordering for a live site, rest assured: in-stock units ship within 1 week, and even custom-configured orders rarely exceed 4 weeks. Payment terms are 50% advance, balance prior to dispatch—FedEx, UPS, or DHL express options available globally.
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