NI TBX-50B 50-Pin D-Sub Screw Terminal Block

The NI TBX-50B is a 50-pin D-SUB screw terminal block that terminates field wiring to NI data acquisition and control devices. This DIN rail-mountable accessory simplifies signal connections while reducing wiring errors in industrial and laboratory environments. It replaces the NI TBX-50 and is manufactured by Phoenix Contact as part of the National Instruments ecosystem.

– Technical Specifications

• Connector Type: 50-pin male D-SUB
• Terminal Type: Screw terminals
• Maximum Voltage: 150 V AC/DC
• Maximum Current: 2.5 A AC/DC
• Wire Gauge: 22–12 AWG Cu
• Dimensions: 98.2 mm × 69 mm (3.87 in. × 2.72 in.)
• Part Number (NI): 782866-01
• Part Number (Phoenix Contact): 2315159

– Key Features

• DIN rail mountable for flexible enclosure integration
• Screw terminal connections support 22–12 AWG copper conductors
• Shield connections available on D-SUB interface
• Supports multiple cable assembly types: DIN60, LFH200, LFH160
• 150 V / 2.5 A rating for AC or DC signal termination
• Compact form factor: 3.87 in. × 2.72 in.

– Typical Applications

• Signal termination for PXI-2575 and SCXI-1175 modules
• Field wiring connection in data acquisition systems
• Switch device signal interfaces
• Industrial control and laboratory instrumentation

– Compatibility & Integration

Works with NI data acquisition devices and NI Switch devices supporting 50-pin D-SUB connectors. Compatible cable assemblies include DIN160, LFH160, and LFH200. Installation at voltages exceeding 42.4 Vpk or 60 VDC requires placement in a UL-rated NEMA or IP enclosure.