Product Description:

The 3TB170.91 terminal block is produced by B & R Automation for use with the System 2005 Controllers series. It is a board-mounted wiring interface that provides a detachable field connection point between controller I/O channels and machine cabling. Within an automation panel, the module’s push-in contacts allow solid, stranded, or ferruled conductors to be inserted quickly, which shortens installation time and helps maintain consistent terminations. Because the block is detachable, cabinet wiring can remain terminated while the control electronics are separated for inspection.

The connector carries up to 10 A/contact while maintaining rated insulation to 300 V, so typical sensor, relay, or actuator loops can be connected without separate interface blocks in many control circuits. There are 20 positions arranged on a 5.08 mm pitch, a spacing that matches the System 2005 backplane headers and preserves creepage distance for the stated voltage class. Each clamping cage accepts conductors as large as 2.50 mm², which covers both fine-strand and solid wires. The position count also supports dense I/O groupings on compact controller cards where multiple field signals must terminate in a narrow footprint.

The contact set limits resistance to 5 mΩ, minimizing heat rise across the interface when full current is present. Because the retention mechanism uses the Push-In style, a ferruled lead up to 1.50 mm² can be seated by hand pressure, and the same cross-section applies to the covered ferrule rating so the conductor barrel remains enclosed by the clamp. The cage components are stamped from Copper, which provides good electrical conductivity and corrosion resistance during the life of the controller assembly. Low contact resistance and spring-clamp retention help maintain stable electrical continuity during normal cabinet vibration.