High-voltage relay plug-in devices

8 March 2006 Switches, Relays & Keypads

National Instruments has added two new UL-listed high-voltage plug-in mechanical relay devices to its data acquisition range.

The PCI-6521, PXI-6521 and PCI-6520 industrial digital I/O devices deliver eight ±30 V d.c. differential digital inputs and eight non-latching mechanical relay outputs, divided into five form-A and three form-C relays.

The digital inputs offer industry-standard 24 V logic levels and 60 V continuous channel-to-channel isolation. Engineers can use the NI 6521 relays to switch up to 150 V a.c./V d.c. with maximum switching power of 60 W and control high-voltage devices directly from the board. In addition, they can take advantage of the high-reliability industrial feature set - including watchdog timers, programmable power-up states, digital filtering and change detection for direct sensor connectivity - that helps provide reliable operation on a Windows OS, even in the event of an operating system failure requiring a soft reboot.

Unlike many other mechanical relay plug-in devices, the NI-6521 and PCI-6520 are UL certified, ensuring that the product is safe to use. NI 6521 devices feature a keyed connector to prevent the user from accidentally connecting a high-voltage cable to a low-voltage device. Additionally, the PCI-6521 offers insulation covers on both sides of the board. The trace spacing and widths are designed to comply with UL requirements for safe high-voltage test and measurement products, and all safety critical components are rated to handle at least the specified voltage and currents of these boards.

The new devices are also well-suited for use with a programmable automation controller (PAC) for automotive test, industrial monitoring and simple on/off control applications.

For more information contact NI South Africa, 0800 203 199.

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