NI SCXI-1161 Relay Switching Module

The NI SCXI-1161 is an 8-channel relay switching module for the SCXI platform, providing independent single-pole double-throw (SPDT/Form C) non-latching relays for signal switching, routing, and control. Each channel offers normally closed, normally open, and common terminals with gold clad silver alloy contacts rated to 8 A at 125 Vrms, 6 A at 250 Vrms, or 5 A at 30 VDC. The module integrates directly into SCXI chassis and connects to National Instruments DAQ boards via a 50-pin ribbon interface, with 24 screw terminals for signal attachment. Software-programmable through NI-SWITCH drivers and LabVIEW, LabWindows/CVI, or register-level programming, it scales from single modules to thousands of controlled signals across multiple chassis.

– Technical Specifications

Relay Performance
• 8 independent SPDT (Form C) non-latching relays
• Switching capacity: 8 A @ 125 Vrms, 6 A @ 250 Vrms, 5 A @ 30 VDC
• Maximum switching rate: 3 operations per second
• Operate/release time: 15 ms
• Contact material: Gold clad silver alloy
• Contact-to-coil isolation: 250 Vrms
• Contact-to-contact breakdown voltage: 750 Vrms
• Working common-mode voltage: 250 VAC or VDC
• Arc suppressor pads included
• Power-up default: All channels’ COM positions linked to NC positions

Electrical & Interface
• Per-channel isolation
• 50-pin male ribbon-cable header (back-signal connector)
• 16 × 2 minicombicon header
• 24 screw terminal I/O connectors

Physical
• Dimensions: 17.2 cm × 20.3 cm × 3.0 cm
• Weight: 12 oz

Environmental
• Operating temperature: 0 °C to 50 °C
• Storage temperature: -20 °C to 70 °C
• Relative humidity: 5% to 85% non-condensing

– Key Features

• Configurable relay logic with jumper settings (W1, W2)
• Built-in inductive load protection via arc suppressor pads
• Fast 15 ms switching response
• Galvanic isolation between channels

– Typical Applications

• Automated test systems
• Data acquisition and signal routing
• Industrial process monitoring and control
• Medium to higher-level signal switching

– Compatibility & Integration

Works with NI MIO boards (Lab-NB, Lab-PC, Lab-PC+, Lab-LC, PC-LPM-16/PnP), DIO-24, DIO-32F, and DIO-96. Cascades with other SCXI modules within single or multiple chassis for expanded signal management.