Description
1. Product Title
National Instruments NI‑9481‑ 4‑Channel SPST Electromechanical Relay C‑Series Output Module
2. Product Overview
The NI‑9481 is a C‑series electromechanical relay output module built for NI CompactDAQ and CompactRIO hardware platforms. This unit provides four independent SPST relay channels for switching AC and DC loads within test, measurement and industrial control systems. NI‑9481 features channel‑to‑channel galvanic isolation and per‑channel status LED indicators for quick operational diagnostics. It directly interfaces with actuators, solenoids, small motors and auxiliary field devices, executing on‑off control commands sent from the host chassis. The mechanical relay architecture enables switching of higher‑voltage field circuits while separating low‑voltage measurement electronics from noisy power loads, reducing ground loop interference and protecting acquisition hardware from transient voltage surges.
3. Technical Specifications
- Brand: National Instruments (NI)
- Model: NI‑9481
- Warranty: One Year
- Condition: 100% New & Original
- I/O Type: 4‑channel SPST Form‑A electromechanical relay output
- Switching Rating: 250 Vrms (2 A), 60 VDC (1 A), 30 VDC (2 A) per channelNI
- Isolation: Channel‑to‑channel 250 Vrms isolation
- Indicator: Per‑channel status LED
- Operating Temp: ‑40 °C to +70 °C
- Mechanical Life: 20 000 000 operations (no‑load); 100 000 operations under rated resistive load
- Compatibility: CompactDAQ / CompactRIO C‑Series chassis
- Mounting: Slot‑mount into C‑Series chassis, screw‑terminal field wiring
- Compliance: CE, UL, cUL certified
5. Application Scenarios
- Industrial Test‑Bench System: Integrated into CompactRIO racks to control solenoid valves, indicator lamps and auxiliary actuators for automated product validation test sequences.
- Laboratory Data‑Acquisition Setup: Deployed with CompactDAQ hardware to switch external power circuits, enabling synchronized load control alongside sensor measurement workflows.
- Machine Monitoring & Auxiliary Control: Used in condition‑monitoring cabinets to trigger alarm beacons, interlock relays and peripheral auxiliary equipment based on real‑time measurement thresholds.
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