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ABB TU890 3BSC690075R1 Compact Terminal Block

Configured for field signal termination and process power connection in ABB S800 I/O systems, the ABB TU890 3BSC690075R1 (TU890 Compact Terminal Block) provides direct physical electrical connection between I/O modules and external field wiring.

Hardware Specifications

Parameter	Specification
Model	TU890 3BSC690075R1
Brand	ABB
Product Type	Compact Terminal Block
Origin	Sweden
Weight	0.22 kg
Dimensions	21 x 6.5 x 8.8 cm
Operating Temp	55 deg C
Power Consumption	Passive terminal connection, no external power consumption
Type	Compact
Connection	Terminal block
Channels	8
Voltage	24 V
Mounting	Horizontal DIN rail mounting
Process Connections	27 blue terminals
Compatible I/O Modules	AI890, AI893, AI895, AO890, AO895, DI890, DO890
Mounting Detail	55 deg mounting orientation

ABB S800 I/O Terminal Interface and I/O Density Scaling

The TU890 provides field wiring termination for ABB S800 I/O modules. It connects process signals, module power interfaces, and ModuleBus-related connections through a compact terminal structure.

Furthermore, the terminal block supports I/O density scaling by allowing compact installation arrangements with compatible AI, AO, DI, and DO modules. The mechanical keying design prevents incorrect module insertion, while the DIN rail latching mechanism maintains fixed positioning during operation.

The ABB S800 architecture uses structured backplane and ModuleBus communication paths. Therefore, correct terminal assignment and module compatibility verification are required before installation.

Frequently Asked Questions

Q: Which ABB I/O modules are compatible with the TU890 3BSC690075R1?
A: The TU890 is specified for use with ABB AI890, AI893, AI895, AO890, AO895, DI890, and DO890 I/O modules.

Q: Does the TU890 require an external power supply?
A: No. The TU890 is a passive terminal block and does not require an independent power input.

Q: What mounting method does the TU890 use?
A: The TU890 uses horizontal DIN rail mounting with an integrated latching device for mechanical retention.

Field Installation Guidelines

• Install the TU890 on a correctly positioned DIN rail according to the cabinet mechanical layout.
• Verify terminal assignments before connecting field wiring to avoid incorrect signal routing.
• Keep field signal cables separated from high-current power conductors to reduce electrical interference.
• Connect cable shields according to the control cabinet grounding design and applicable site standards.
• Confirm that the installed I/O module type matches the terminal block compatibility list before energizing the system.

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