TRICONEX 3700A – TMR Power Supply Module for Tricon Safety Systems

The TRICONEX 3700A is commonly used as the power supply module in TRICON triple modular redundant (TMR) safety systems, supporting high‑availability applications where downtime simply isn’t an option. From my experience, this module is typically installed in redundant pairs or trios to keep the backplane rails stable while the controller and I/O carry on without interruption. You might notice that the physical design matches the standard Tricon rack format and can be hot-swapped, which makes field replacement faster and safer during live plant operations.

Typical users are ESD, HIPPS, and turbine control teams who need predictable power integrity to maintain SIL3 safety functions. One thing I appreciate is the straightforward status indication and diagnostics: maintenance can quickly confirm module health and carry on with routine proof‑testing schedules.

Our Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery time: In‑stock items ship in about 1 week; no more than one month at the latest
• Payment: 50% advance payment; full payment before delivery
• Express delivery: FedEx, UPS, DHL

Key Features

• TMR-ready power architecture: Designed for use in redundant configurations so the system remains powered if one module is removed or fails.
• Hot-swappable service: Typically replaceable online, helping avoid planned shutdowns during maintenance windows.
• Backplane health monitoring: Status LEDs and diagnostics support faster fault isolation on site.
• Stable, filtered output rails: Conditions input power to feed the Tricon backplane with clean, predictable supply.
• Mechanical keying and secure latching: Helps prevent mis‑insertion and maintains reliable contact in high‑vibration areas.
• System SIL3 capability: When used within a certified TRICON system, supports IEC 61508 SIL3 safety applications.
• Form‑fit compatibility: Matches standard TRICON main chassis slot format for quick drop‑in replacement.

Technical Specifications

Brand / Model	TRICONEX 3700A
HS Code	8538.90 (Parts for industrial control equipment; final subheading may vary by country)
Power Requirements	Typically 120/240 Vac, 50/60 Hz input; redundant operation supported. Confirm the exact input and rating on the module label and system BOM.
Operating Temperature	0 to 60 °C (typical for Tricon modules; ensure cabinet ventilation for continuous duty)
Signal I/O Types	N/A (power supply module; no field I/O)
Communication Interfaces	Backplane power and status only; no external comms ports
Installation Method	Single‑slot, hot‑swappable installation in TRICON main chassis; follow keying guides and latch fully
Dimensions & Weight	Single‑slot Tricon form factor; weight typically around 1.5–2.0 kg

Note: Specifications and available variants can differ by system generation and plant standards. We’ll verify your exact part number and BOM before shipment.

Application Fields

The 3700A is widely used in:

• Emergency Shutdown (ESD) and Fire & Gas systems
• High‑Integrity Pressure Protection Systems (HIPPS)
• Turbine and compressor control, anti‑surge, and protection
• Burner Management Systems (BMS) in refineries and power plants
• Chemical processing and petrochemicals where SIL3 safety is required

Advantages & Value

• Reliability first: Redundant deployment minimizes single‑point risk and supports continuous plant operation.
• Compatibility: Form‑fit with Tricon main chassis for drop‑in replacement during planned turnarounds or live swaps.
• Cost control: Reduces unplanned downtime; from procurement side, it seems to be one of the most impactful spare parts to keep on hand.
• Technical support: We help match the exact revision and input type to your cabinet BOM, so commissioning goes smoothly.

A maintenance lead recently told us, “We swapped a 3700A during a proof test and didn’t lose a scan. The LEDs made it easy to confirm we were back in a healthy state.” That’s typically the experience in well‑maintained Tricon racks.

Installation & Maintenance

• Cabinet & environment: Use a clean, ventilated enclosure; maintain ambient within the specified temperature; avoid corrosive atmospheres.
• Power wiring: Feed from a clean, protected source; verify correct input rating per module nameplate; follow plant grounding practices.
• Redundancy: Install in redundant pairs or TMR as defined by your SRS; confirm load sharing LEDs and health status after insertion.
• Hot‑swap handling: Use approved procedures and ESD protection; latch the module fully to ensure backplane connection.
• Routine checks: Inspect connectors, clean dust with dry air, confirm status indicators, and log power events in maintenance records.

Quality & Certifications

• Designed for use in TRICON systems assessed to IEC 61508 SIL3 (system-level certification)
• Typically complies with CE and UL/CSA industrial control requirements
• RoHS/Reach status can vary by manufacturing lot and year; we can confirm against your compliance needs
• Backed by a 365‑day warranty and pre‑shipment functional verification

Related Components Often Paired With 3700A

• TRICONEX 3008 Main Processor Module (MPM) for system control
• TRICONEX 4351B Analog Input and 3708E/3721 series I/O modules for field signals
• Tricon main chassis and termination panels matching your I/O mix