TRIO POWER DIN-Rail Power Supply

Overview

The Phoenix Contact TRIO POWER is the most technically distinguished DIN-rail 24 V DC power supply in the industrial automation market, introduced with SFB (Selective Fuse Breaking) technology that allows a single TRIO POWER to simultaneously act as a distributed panel power source and a selective branch-circuit protection device — eliminating the need for individual mini-circuit breakers on every 24 V DC branch in a control panel. SFB pulses 4× rated output current for 12 ms when it detects an overloaded downstream branch, blowing the series fuse on that branch while all other downstream loads remain powered. The main PSU does not latch off, reset, or alarm — a genuine single-fault-tolerant architecture for 24 V DC distribution.

Operating from −25°C to +70°C without output derating is a notable specification: most competing DIN-rail supplies derate output current above +50°C or +60°C. In hot electrical rooms, compact panels, or outdoor enclosures where ambient temperatures can reach 60–65°C, the TRIO POWER continues delivering full rated output. This eliminates the need to oversize the supply to achieve the required current margin at elevated temperatures — a common but expensive engineering workaround.

NFC (Near Field Communication) diagnostics enable a maintenance technician to hold any NFC-capable smartphone to the front face of the PSU and read — through the panel door — energy consumption since installation, peak current demand, number of overloads, and output voltage history. This data integrates with Phoenix Contact's PLCnext Cloud or local SCADA historian for power quality trending without any electrical connections or instrument access to the live panel interior.

Key Features

• SFB Technology — Branch-Selective Fault Isolation — Delivers 4× rated output current (e.g., 80 A from a 20 A supply) for exactly 12 ms when a downstream branch fuse needs to blow. This energy is sufficient to blow a C2 or gG fuse rated from 1 A upwards reliably, even on long 24 V DC cable runs with significant loop resistance. Other branches remain powered throughout — eliminating panel-wide 24 V outages from a single downstream wiring fault.
• NFC Diagnostics — No Live Panel Access Required — The TRIO POWER's embedded NFC chip stores energy metering data, fault log, and power quality statistics readable via any Android NFC smartphone. Technicians read the data through a closed IP65 panel door — no need to open energised panels for routine power quality checks. The Phoenix Contact APP exports data as CSV for import to Excel or CMMS maintenance systems.
• 96% Efficiency — Class-Leading Thermal Performance — At 96% efficiency (measured at full load, 400 V AC input, 25°C), the TRIO POWER 960 W model dissipates only 40 W as heat — versus 80–100 W for 92% efficient competitors at the same load. In high-density VFD panels already managing significant heat loads, this 40–60 W reduction per PSU meaningfully reduces cooling system size and energy consumption, paying back the price premium within months.
• Parallel and Redundancy Operation — Multiple TRIO POWER units connect in parallel using the optional TRIO DIODE decoupling module for N+1 redundancy without cross-current between supplies. Automatic load sharing (±0.1 V output adjustment) balances current between parallel supplies without active communication. The TRIO DIODE provides isolation between the two PSUs so failure of one does not affect the other — essential for SIL 2 and SIL 3 safety-instrumented systems requiring power supply redundancy.

Technical Specifications

Application Areas

• 24 V DC distribution for PLC, I/O, and sensor panels
• Safety-instrumented system power redundancy (SIL 2/3)
• High-density MCC panels requiring minimal heat dissipation
• Remote outdoor cabinets with high ambient temperature
• Food & beverage hygienic panels needing NFC closed-door diagnostics
• Predictive maintenance power quality monitoring