HRM-PD1-RS485 is DIN-rail mounted protection device for half-duplex RS-485 lines with full voltage span of -7..+12V support. Modifying secondary protection stage on TBU and TVS diodes to use with different interfaces like CAN, discrete I/O etc. Actual specs depends on installed hardware, maximum ratings for default configuration are below:
- 12kA, 8/20us 1 operation
- 10kA, 8/20us >10operation
- DC sparkover 90V, operating -7...+12V
- Current limit up to 300mA per channel
- ESD ± 30kV max(Air and Contact)
All hardware is qualified for industrial temperature range down to -40°. Refer to datasheets of actual parts for more details more details.
- What are good pints of this design?
There are key advantages:
- high-quality industrial grade hardware with better performance compared to ordinary solutions
- made as standalone device with good housing
- correct PCB layout principles are implemented
Pretty often I see protectors made on low quality stuff without any investigation of GDT specs, with poor system design like connecting surge carrying parts with long thin wires inside and of course(my favorite) thin sub-mm long traces in GDT nodes. In this design I tried to offer, let's say, a little bit better solution.
- Can I use different parts here?
Check project variants as they're good start point to deal with TVS, at the same time, always keep TBU devices rated for 850V and don't change GDT.
- Where are 3D models?
At the moment of project release, CC doesn't support direct import from Altium- and the original project is made in Altium. Because making parts in CC is extremely annoying and noneffective compared to Altium I've attached original PCB and schematic files- you're free to use the for any purpose.
- Do you plan more designs like this?