TBUP357-1A20-AB00 SCHNEIDER

TBUP357-1A20-AB00 SCHNEIDER Termination Unit

Product  Description：

Schneider Electric Termination Units, often referred to as Field Termination Assemblies (FTAs) or Terminal Base Units, serve as the vital physical and electrical connection interface between field instrumentation and control system I/O modules. Designed primarily for the Modicon PLC/ePAC systems and Foxboro Distributed Control System platforms within Schneider Electric's automation portfolio, these units provide structured wiring terminals for field signals while cleanly routing control and power lines back to the system backplane or I/O cards via pre-assembled cable harnesses.

Product Parameters

The technical baseline of a Schneider Electric Termination Unit focuses on electrical isolation, terminal density, and field signal compatibility:

• Terminal Density: Available in flexible channel density options, typically supporting 8-channel, 16-channel, or 32-channel configurations per unit.

• Field Voltage Ratings: Designed to handle diverse signal levels, including 24V DC, 48V DC, 120V AC, 230V AC, and low-voltage analog signals such as 4-20mA and 0-10V DC.

• Maximum Current Capacity: Individual channel current ratings typically range up to 2 Amperes for discrete channels, with higher-capacity bussed power terminals rated up to 10 Amperes.

• Wiring Connection Types: Features choices of push-in spring-clamp terminals for fast, vibration-proof installation, or standard screw-clamp terminals for heavy gauge field wires.

• Isolation and Protection: Integrated galvanic isolation between field channels and system electronics, featuring built-in current-limiting fuses or surge suppression devices per point.

• Mounting Style: Engineered for standard 35mm DIN rail mounting inside control cabinets, offering compact footprints for high-density panel layouts.

Product Advantages

Schneider Electric Termination Units deliver substantial operational efficiency and panel-building advantages:

• Streamlined Cabinet Wiring: Replaces point-to-point hand wiring with marshaled cable assemblies, significantly reducing control panel assembly time and minimizing wiring errors.

• Enhanced Maintenance and Hot-Swappability: Allows I/O cards or processing modules to be disconnected or replaced without disturbing the permanent field wiring connected to the termination unit.

• Built-in Signal Conditioning and Protection: Many termination units incorporate individual channel fusing, LED status indication, and signal isolation directly on the assembly, protecting expensive I/O modules from field faults.

• Modular System Expansion: The compact DIN-rail design permits easy system scaling, allowing panel builders to add additional field termination blocks as the machine or plant grows.

• Reduced Commissioning Costs: Standardized connector pinouts and pre-tested cable assemblies streamline point-to-point loop testing during factory acceptance testing and site commissioning.

Product Applications

These termination assemblies are widely utilized across various continuous process and discrete manufacturing plants:

• Process Plant Signal Marshaling: Organizing complex 4-20mA loop signals from pressure, temperature, and flow transmitters in oil refineries and chemical plants.

• Motor Control Center Interfacing: Connecting run, stop, and fault status signals from remote motor starters and variable frequency drives to the centralized control rack.

• Safety System Integration: Interfacing discrete field emergency shutdown buttons, gas detectors, and safety switches to safety-certified Modicon or Foxboro I/O modules.

• Building Automation and HVAC Control: Marshaling field sensor inputs and actuator outputs for large air handling units and central chiller plants.

• Water and Wastewater Distribution: Connecting telemetry inputs, valve actuators, and level sensors at remote pumping stations back to the local programmable controller.

Important Precautions

To ensure long-term signal integrity and prevent electrical hazards, the following installation rules must be observed:

• Strict Voltage Matching: Verify that the field supply voltage applied to the termination unit terminals strictly matches the rating of the installed termination unit and its associated I/O card.

• Tightening Torque Regulations: For screw-terminal variants, ensure that terminal screws are torqued strictly to the manufacturer's specification to avoid loose connections or damaged terminal threads.

• Cable Shield Management: Ensure field cable shields are properly grounded at the designated ground bus on the termination unit. Never ground both ends of a signal cable shield to avoid creating disruptive ground loops.

• Fuse Replacement Procedures: When replacing blown channel fuses, always use fuses of the exact specified current rating and fast-acting type to maintain adequate protection for the connected I/O module electronics.

• Moisture and Environmental Isolation: Install termination units inside an enclosure rated appropriately for the operating environment. Dust, moisture, or corrosive fumes inside the panel can lead to terminal oxidation and signal degradation over time.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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