{"product_id":"jonsson-tech-bb250-2-250a-58vdc-busbar-2-m8-posts-150-mm-tin-plated-copper-v-0-cover","title":"Jonsson Tech BB250-2 | 250A 58VDC Busbar — 2 × M8 Posts, 150 mm² Tin-Plated Copper, V-0 Cover","description":"\u003cp\u003eThe \u003cstrong\u003eJonsson Tech BB250-2\u003c\/strong\u003e is a two-post DC busbar for 12 V, 24 V and 48 V systems — 150 mm² of tin-plated copper on 40 mm centres, rated 250 A continuous to 58 V DC, with a flame-retardant cover that goes on last and comes off first.\u003c\/p\u003e\n\n\u003cp\u003eIt was designed around one rule: \u003cstrong\u003eno plastic in the bolted joint.\u003c\/strong\u003e On most moulded busbars the stud clamps down through the plastic body, and plastic under a torqued joint creeps. The joint relaxes, resistance climbs, and the bar runs hot — which is the one failure mode a busbar must not have. Here the clamp load runs bolt head → steel sleeve → copper → lug → washer → nut. Every element in that path is metal, and the plastic carries none of it.\u003c\/p\u003e\n\n\u003ch3\u003eBuilt for the current, not just rated for it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e150 mm² conductor\u003c\/strong\u003e — 70 × 25 × 6 mm tin-plated copper. At 250 A that's 1.67 A\/mm², and under 0.3 W of loss across the 40 mm between posts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25 mm wide bar\u003c\/strong\u003e — a 2\/0 lug tongue is supported across its full width. No overhang, no point loading at the crimp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo M8 stainless posts\u003c\/strong\u003e on 40 mm centres, torqued to 13 N·m (115 in-lb), with 21 mm of stud above the bar — enough thread to land two lug tongues on one post.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel-sleeved posts.\u003c\/strong\u003e The sleeve, not the plastic, takes the clamp. Torque it once and it stays torqued.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eA cover that works the way you install\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIts own two screws, outboard of the base.\u003c\/strong\u003e Mount the base, land your cables, then drop the cover on. You never have to back out a mounting screw after the cables are connected — and the cover comes off later without disturbing the base or the lugs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScalloped cable guides.\u003c\/strong\u003e An arch over each post, sized to clear a 2\/0 crimp barrel, so the cover drops straight down over cables that are already landed. Cables exit left, right, or both.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlame-retardant throughout.\u003c\/strong\u003e Base \u003cem\u003eand\u003c\/em\u003e cover are both printed in UL 94 V-0 rated ABS — not just the base.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrain relief pads\u003c\/strong\u003e built into the base, 0.2 mm under each lug tongue, so a cable pulled sideways loads the base and not the crimp.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePrinted and assembled in Spring, Texas.\u003c\/strong\u003e Made to order by a Victron-trained installer who builds these systems for a living.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous rating\u003c\/td\u003e\n\u003ctd\u003e250 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum voltage\u003c\/td\u003e\n\u003ctd\u003e58 V DC (12 V \/ 24 V \/ 48 V systems)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePosts\u003c\/td\u003e\n\u003ctd\u003e2 × M8 stainless, 40 mm (1.57 in) centres\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePost torque\u003c\/td\u003e\n\u003ctd\u003e13 N·m \/ 115 in-lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStud above bar\u003c\/td\u003e\n\u003ctd\u003e21 mm — fits two lug tongues\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductor\u003c\/td\u003e\n\u003ctd\u003e70 × 25 × 6 mm tin-plated copper, 150 mm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent density at 250 A\u003c\/td\u003e\n\u003ctd\u003e1.67 A\/mm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoss between posts at 250 A\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.3 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase and cover\u003c\/td\u003e\n\u003ctd\u003eFlame-retardant ABS, UL 94 V-0 rated material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase mounting\u003c\/td\u003e\n\u003ctd\u003e2 × M5, 100 mm (3.94 in) centres\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCover mounting\u003c\/td\u003e\n\u003ctd\u003e2 × M4, 138 mm (5.43 in) centres — independent of the base\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCable exits\u003c\/td\u003e\n\u003ctd\u003eBoth long sides, scalloped, clears a 2\/0 crimp barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall with cover\u003c\/td\u003e\n\u003ctd\u003e150 × 51 × 48 mm (5.91 × 2.01 × 1.89 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase alone\u003c\/td\u003e\n\u003ctd\u003e114 × 40 × 15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e226 g (0.50 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003ePrinted and assembled in Spring, Texas\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eIn the box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 × busbar base with tin-plated copper bar fitted\u003c\/li\u003e\n\u003cli\u003e1 × flame-retardant cover\u003c\/li\u003e\n\u003cli\u003e2 × M8 × 40 stainless post bolts, with steel load sleeves, flat washers and nuts (fitted)\u003c\/li\u003e\n\u003cli\u003e2 × M5 × 20 base mounting screws and washers\u003c\/li\u003e\n\u003cli\u003e2 × M4 × 20 cover mounting screws and washers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGood to know\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNot finger-safe to IP2X — the cable arches are open by design so the cover fits over landed cables. Mount it in a locker or enclosure, as you would any open busbar.\u003c\/li\u003e\n\u003cli\u003e58 V DC is the rating for lithium and lead systems up to 48 V nominal. DC only.\u003c\/li\u003e\n\u003cli\u003eMade to order. If you need a quantity, message us and we'll give you an honest lead time.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Jonsson Tech","offers":[{"title":"Default Title","offer_id":49313385840859,"sku":"JT-BB250-2P","price":37.76,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/3200\/9947\/files\/side_d364aaf2-42ca-4ef9-8c08-7d83b3eb6cdd.png?v=1789571091","url":"https:\/\/www.jonssontech.net\/products\/jonsson-tech-bb250-2-250a-58vdc-busbar-2-m8-posts-150-mm-tin-plated-copper-v-0-cover","provider":"Jonsson Tech LLC","version":"1.0","type":"link"}