The ICS TRIPLEX T8292 is a dedicated dual-circuit 5-way miniature circuit breaker 24 V DC power distribution unit for the Rockwell Automation Trusted TMR safety system. Developed for N+1 or 100% fully redundant 24 V DC power supply applications, it supports standard DIN rail mounting.
The unit is equipped with independent circuit monitoring circuits. Local visual indication via on-board LEDs is triggered when a single circuit breaker trips. Passive relay contact outputs are integrated to transmit unified alarm signals for connection to external monitoring systems. As the core distribution component of the power supply chain in Safety Instrumented Systems (SIS), it enables rapid isolation of short-circuit and overload faults on loads together with centralized alarming, ensuring uninterrupted operation of safety control systems.
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Model Code Decoding
- T: Product line identifier for the Trusted range, denoting triple modular redundant safety control hardware
- 82: Category code for power distribution modules
- 92: Sub-product code representing a 24 V DC power distribution unit with built-in MCB miniature circuit breakers, dual-circuit and 5-channel outputs
No variant suffixes are available. The supporting document reference is PD-T8292, and it is compatible with Trusted system software version 3.6.1.
Core Product Features
Output Channel Configuration
Four dual 24 V / 20 A MCB-protected outputs: Directly connectable to Trusted controllers or expansion racks, or used as upstream power supply for T8297 fuse distribution units.One dual 24 V / 3 A MCB-protected output: Dedicated to low-power loads such as system cooling fans and compact field acquisition modules.
Monitoring & Alarm Functions
Two green power indicator lights illuminate to confirm normal dual-input power supply. Ten independent red channel indicator lights stay lit when the corresponding circuit breaker trips.Built-in passive normally open common alarm contacts stay closed under normal operating conditions and open upon any circuit trip. They can interface with external alarm systems without consuming power.
Mechanical Structure & Installation
Compatible with standard TS32 and TS35 DIN rails. Dimensions: 108 mm × 240 mm × 109 mm, net weight: 823 g.LU10.16 screw terminals suit cables ranging from 0.5 mm² to 16 mm², paired with FCI Qikmate connectors.Maximum total input current: 60 A; maximum contact switching voltage: 60 V DC / 125 V AC.
Redundancy Switching Mechanism
On-board LK-N+1 shorting jumper: Retain the jumper for N+1 single-source redundancy mode; remove the jumper to switch to 2N fully independent dual redundancy mode. No rewiring is required for topology conversion — only jumper adjustment is needed.
Environmental Specifications
Operating temperature: 0 ℃ to +60 ℃; storage & transit temperature: -25 ℃ to +70 ℃.Humidity range: 10%–95% non-condensing, compliant with specifications for deployment in hazardous explosion-proof areas.
Application Industries
Oil & Gas: Power distribution for ESD emergency shutdown systems and wellhead SIS loops.Fine Chemicals: Power supply for SIL-rated safety instrumented systems and reactor interlock control systems.Thermal & New Power Generation: Power distribution for unit protection, boiler safety interlocks and auxiliary equipment safety control racks.Rail Transit Signalling: Redundant power distribution for station safety interlocks and track signalling systems.Pharmaceutical Plants: Power supply for automatic explosion-proof control systems in hazardous workshops and interlock equipment in cleanrooms.Water Treatment Plants: Power distribution for sewage emergency cut-off and chemical dosing safety interlock loops.
Matching Supporting Products
Matching Power Enclosures
T8200, T8201, T8202 Trusted series 24 V power supply enclosures
Downstream Power Distribution Modules
T8293 15-channel fuse-protected power distribution unit
Dedicated Connection Cables
TC-001-01 Power cable for controller racksTC-002-01 Interconnection cable between T8292 and T8293TC-011-01 Power cable for cooling fans
System Load Equipment
T8270 System cooling fan trayTrusted controller racks and expansion racksVarious digital / analog FTA terminal boards
FAQ
Q1: How to tell N+1 and 2N versions apart when purchasing T8292, and do jumpers need to be ordered separately?A1: Each unit comes pre-installed with an LK-N+1 jumper and defaults to N+1 mode. To switch to full 2N redundancy, simply remove the factory-fitted jumper with no extra spare parts required. One single model supports both topologies, so there is no need to select different versions when placing orders.
Q2: For a complete SIL4 safety system, what is the maximum number of controller racks that one T8292 can power?A2: In N+1 mode, the total load of one unit shall not exceed 1.25 kW, supporting up to 4 racks; two cascaded T8292 units under N+1 topology can power a maximum of 8 racks. In 2N mode, the single-unit load limit is 750 W for up to 4 racks, and two cascaded units can supply a maximum of 8 racks.
Q3: What is the input voltage range of T8292, and is it compatible with a 28 V DC power supply?A3: The rated input voltage range is 22 V DC to 28 V DC, with 24 V DC as the standard supply. It can work directly with a 28 V DC power source without a voltage reduction module.
Q4: Must T8292 be used together with T8293? Can it supply power directly to field terminal boards alone?A4: Direct standalone connection to field FTA terminal boards is not recommended. The T8292 is designed for high-power rack power supply and lacks graded small-current fuse protection. The standard architecture uses T8292 as the upstream power supply feeding T8293, which then distributes power to field devices.
Q5: One red fault LED on the unit stays on constantly, and the MCB trips again several seconds after reset. How to troubleshoot this?A5: Disconnect all external loads of this circuit and close the MCB alone. If tripping stops, there is a short circuit or overload on the downstream load; inspect cables and terminal boards for short faults. If tripping persists under no-load conditions, the internal circuit of the module is faulty and the module needs replacement.
Q6: One of the two green power indicator lights goes off and the alarm contact opens simultaneously. What fault does this indicate?A6: The corresponding 0V/V1+ or 0V2/V2+ input power is cut off. Check the output of the upstream T820x power enclosure, loose terminals on power cables and broken wiring. The indicator light will recover automatically after power supply is restored.
Q7: Is full power cut-off required when connecting or disconnecting cables during maintenance? Are there any ESD protection requirements?A7: It is recommended to cut off both input power supplies before plugging or unplugging terminal wires. The module PCB contains electrostatic-sensitive chips; operators must wear anti-static wristbands and avoid direct contact with exposed metal contacts on the circuit board.
Q8: Will an operating environment with 90% non-condensing humidity affect the long-term operation of T8292?A8: The product’s specified operating humidity range is 10%–95% non-condensing, allowing stable long-term operation under non-condensing conditions. If condensation may occur on site, cabinet dehumidifiers and temperature control equipment should be added.
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