Hey all. Sorry for the delay but running a small business keeps me hopping. First, I want to retract my remark about the Victron 275A switch being ‘crap’. I still think it’s not built well, but in light of the results below I can state that from an internal resistance perspective it’s better than three Blue Sea Systems 6006 (m-series) switches we tested in the shop yesterday.
Test:
This was certainly not a carefully run test. I don’t have time for that. For each switch type we turned them off & on 15 times to ‘wipe’ the contacts. And since the 6006 tested poorly, we took three samples of the shelf for that one to make sure we weren’t testing a single bum switch. I used a Unit-T micro-ohm meter. It’s not a Fluke, but it’s more than sufficient for this testing. We used 4-wire clamps of course. We tested each switch three times to reduce errors.
All readings are in milliohms
Victron switch:
0.12 - 0.11 - 0.11
BSS 6006 (m-series):
0.54 - 0.53 - 0.55
BSS 9003E (e-series):
0.12 - 0.14 - 0.13
BSS 3000 (hd-series):
0.25 - 0.18 - 0.13
We typically only use the 6006 switches on 24v or 48v systems with 3kVA or 5kVA inverters or it’s e-series for larger systems. HD switches are only used when customers insist on using a 12V system, otherwise they aren’t that useful to us since they aren’t rated for 48V.
Anyway, hope this helps someone 