Switching high current DC loads normally requires use of a contactor to avoid arcing as the contacts try to separate. DC pulls a long flame unlike AC which breaks every cycle.


These solid state relays use MOSFET technology to provide an economical and reliable method of switching medium to high power DC loads.


By electrical switching with a semiconductor, there is no arcing as contacts break at high current and the low on-state resistance provides a viable alternative to the bulky and expensive contactors we used to use.


These units are also isolate the control side from the switch side with a 2500VRMS LED light pathway.


You can parallel these units also for higher current switching. If you do, overdrive the input, to get the fastest switch time.

We suggest mounting on a heat sink or steel cabinet back wall for dissipating heat up to 35 watts at full load. We can supply tunnels or open fin heat sinks.

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Output Circuit

  • Load Voltage: 0-30VDC
  • Load Current: 0.02-100A
  • Max On-State Resistance: 0.007Ohms
  • Max On-State Voltage Drop: 0.35V
  • Max Turn On Time: 0.5ms
  • Max Turn Off Time: 0.5ms
  • Max Surge Current: 240A (10ms) – very handy for turn current spikes

Input Circuit

  • Control Voltage: 3-32VDC
  • Control Current: 28mA max.
  • Min Turn Off Voltage: 1.0VDC
  • Input Resistance: 1.2kOhm
  • Drive with pull down or sinking TTL or CMOS easily

Two LabVIEW Books

Book 1 “Hidden Data”, that is, cleaning up LV Program’s by Removing Constants from Diagrams and putting them in Configuration Files for Loading at runtime.

This method does not use ini files but a far more robust LabVIEW centric method not seen in other literature. It also cleans up Diagrams and Self Documents.

Book 2 “Abstraction”, that is, removing complexity in the top layer of a LabVIEW diagram by building Abstracted Message Driven LV Components.

This shows how to build Message driven (Test Verbs) Abstracted named (noun) Components that are safe & robust. It also leads to better cohension of course and no/low coupling.

So only one diagram programming step adjusting the Type Def Cluster constant is required for this step. Next time you re/start the program, the expanded cluster with the new data will automatically appear in the section of your program. The wire from the file read and unflatten from string section will now contain the new constants.

You do not have to add or change anything in the diagram to make this happen. The program automatically knows the shape and structure of the new cluster loaded via the cluster local variable that will have expanded to include the new constants and this gives the shape to the file read and unflatten from string module.

Both books are expansive, yet simple and this information is not often seen in other LabVIEW information. Using these methods will simplify design and development plus stabilise your programs and it even make installs easier. Updating and expanding then follows a standard pattern already in the program design.

Also these methods delineates Public and Private data clearly.

Once you have built a program using this LCOP method, if at any point you want to add or delete constants to any of your components cluster constants, maybe just add one more constant or truly expand the calibration to include a whole new sensor set or add more paths etc, just expand the type def for the constant data clusters and make the new entries. These entries can be any data type or grahical data type. Once this new type def cluster is saved, it will automatically appear in the Constant Data Editor TAB Selector . Enter your new data into the new constants and the editor will save this new set of constants for that cluster that has been expanded.

Third Book

Book 3 “Real Time Cluster Constants Editor”, that is, removed Diagram Constants that are loaded at Run Time from a config file, can now be edited, in situ, inside the Program /or its Component while it runs, allowing tuning of programs in Real Time. Changes to the Constants can also be saved back into their original configuration files at run time. This addition of the Real Time Editor removes the need to exit a compoent or program to edit constants

You also may need a fan if the load is high

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Use a thermal switch to control the fan.

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MasTec designs and fabricates or builds a wide range of products:

Other Products on more MasTec Web pages

Accordion Panel

MasTec recently under took a 4 day Training course for 15 Academics, (Professors and Grad Students), at one of Oceania’s largest universities.

The focus was on getting students to the point where they can undetake projects by the end of the course. A big ask. However, the focus was not on how to use all the bits inside LabVIEW to make software but the development of strategies to allow projects to be undertaken.

The MasTec Instructor has trained all over the globe and has taught over 2000 students.

He will also come to your site and do training with your LabVIEW team, using traditional or these new LabVIEW methods MasTec has developed.

Keep up with MasTec’s latest LabVIEW Notes Notes

MasTec Projects

MasTec has several large projects on its books, spread out over about 3 years. There are gaps in this schedule.

MasTec is undertaking projects in legacy LV 6.1 systems still running in Windows XP.

Major projects are still undetaken in LabVIEW 7.1 running in Windows 7 32 Bit OS, very successfully. LabVIEW 7.1 is still the best LabVIEW ever released. Fast, efficient and stable. Win 7 32 bit OS will be available for some time. Most large corporations are still running Win 7 due to its excellent history

Other projects are using from LabVIEW 2010 up to the present version of 2015 SP1, which is good, but very processor hungry and slower. We only recommend I7s CPUs with this software with SSDs for the OS and LabVIEW.

Over the last year MasTec has completed 6 major projects in sites through out NZ. Several hundred hours of programming work has been completed, as well as many hundreds of commissioning, site management, and hardware installation.

All these projects involved LabVIEW at the core. However, many of these projects also include PACs, PLCs, Process Controllers, with peripherals like Servos, Actuators, VSDs, Water measurement and control, Hydraulic Control and other real world systems.


DC Solid State FET Relay 100A – 30VDC Switching

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Announcement >>> Opportunity

The principal of MasTec has recently decided it is time to realign his life after 50 years of technology, to go horse riding with his wife and dogs Polly, Lilly and newly arrived Freddie.

If you have an interest in owning this important technology company, now is the time to act and start communcation for succession in early 2017.

Keep up with MasTec’s latest LabVIEW Notes Notes

MasTec Projects

LabVIEW Books
LabVIEW Training
LabVIEW Books
LabVIEW Training
LabVIEW Training