# PV 275A Isolator Switch dissasembly and comment **URL:** \ **Category:** DIY\ **Tags:** isolators, domestic, victron\_community, diy\ **Created:** [30 March 2025 11:10 UTC](https://community.victronenergy.com/t/pv-275a-isolator-switch-dissasembly-and-comment/27075 "2025-03-30T11:10:00Z")\ **Posts on this page:** 1\ **Showing post:** 9
**Author:** ![OGPS](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/ogps/32/4120_2.png) [@OGPS](https://community.victronenergy.com/u/OGPS)\ **Post date:** [3 April 2025 15:31 UTC](https://community.victronenergy.com/t/pv-275a-isolator-switch-dissasembly-and-comment/27075/9 "2025-04-03T15:31:23Z")
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 🙂 --- _[View the full topic](https://community.victronenergy.com/t/pv-275a-isolator-switch-dissasembly-and-comment/27075)._