The Triconex 3351 is a high-reliability power supply module for the Tricon Triple Modular Redundancy (TMR) system. It delivers regulated 24 VDC power to the system backplane and internal logic of safety controllers. This power supply supports redundant configurations to maintain Safety Instrumented System (SIS) operation during primary power failures .
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model | Triconex 3351 |
| Manufacturer | Schneider Electric (Triconex) |
| Input Voltage | 115 / 230 V AC (selectable) |
| Output | Regulated 24 VDC for backplane and logic circuits |
| Redundancy | Supports parallel operation for load sharing and fault tolerance |
| Safety Integrity | SIL 3 certified (IEC 61508) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | –40 °C to +85 °C |
| Protection | Overcurrent and short-circuit protection |
| Mounting | Dedicated power slots in Tricon v9 and v10 chassis |
| Enclosure | Heavy-duty aluminum with conformal coating for harsh environments |
Redundant Power Architecture
The Triconex 3351 module forms the cornerstone of the Triconex fault-tolerant power philosophy. Typically, a standard TMR chassis houses dual 3351 units to create redundant power paths. Under normal conditions, these modules share the electrical load. If one unit fails, the partner module instantly assumes the full load without a voltage dip, preventing any interruption to the safety logic execution .
Intelligent Fault Detection and Diagnostics
This power supply incorporates sophisticated internal monitoring circuits that track both the input source and the output regulated voltage. The Triconex 3351 can detect under-voltage or over-voltage conditions and will immediately trigger a system alarm. The front panel features a “Fault” LED for clear visual indication of internal hardware failure, while the system software logs the specific nature of the fault for maintenance teams .
Hot-Swappable Design for Continuous Operation
Like most Triconex components, the 3351 supports “Hot Repair” functionality. This allows a technician to remove a faulty power supply and insert a new one while the system remains powered and the process stays online. The module’s robust mechanical design includes keyed connectors to ensure proper alignment and secure locking into the chassis .
Built for Demanding Industrial Environments
The Triconex 3351 is housed in a heavy-duty aluminum enclosure that acts as a heat sink. This design allows it to operate in high-temperature environments without external cooling fans, which are often a point of mechanical failure. Furthermore, the internal components feature conformal coating to protect against humidity and corrosive chemical atmospheres common in oil refineries and offshore platforms .
Details
| Weight | 2.85 kg |
|---|---|
| Dimensions | 41.2 × 17.8 × 6.2 mm |
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