{"product_id":"dual-row-barrier-terminal-block-tb-series-15a-25a-45a-600v-3-12-positions-tb1503-tb2512","title":"Dual Row Barrier Terminal Block – TB Series, 15A\/25A\/45A, 600V, 3–12 Positions, Screw Connector for Electrical Panels (TB1503–TB2512)","description":"\u003ch2\u003eDual Row Barrier Terminal Block – TB Series, 15A\/25A\/45A, 600V, 3–12 Positions\u003c\/h2\u003e\n\n\u003cp\u003eTB series dual-row barrier terminal blocks for electrical panel wiring, junction box connections, and power distribution applications. The barrier design separates adjacent terminals with insulating barriers, preventing accidental contact between adjacent conductors — essential for high-voltage and high-current applications where terminal-to-terminal shorts would cause equipment damage or fire. The dual-row configuration provides two independent connection points per position, allowing through-wiring (connecting two cables to the same circuit) or bridging between rows.\u003c\/p\u003e\n\n\u003ch3\u003eTB Series Model Reference\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTB1503:\u003c\/strong\u003e 15A, 600V, 3 positions. Wire range: 22–14AWG (0.5–2.5mm²)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTB1504:\u003c\/strong\u003e 15A, 600V, 4 positions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTB1506:\u003c\/strong\u003e 15A, 600V, 6 positions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTB1508:\u003c\/strong\u003e 15A, 600V, 8 positions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTB1512:\u003c\/strong\u003e 15A, 600V, 12 positions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTB2503:\u003c\/strong\u003e 25A, 600V, 3 positions. Wire range: 18–12AWG (0.75–4mm²)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTB2506:\u003c\/strong\u003e 25A, 600V, 6 positions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTB2512:\u003c\/strong\u003e 25A, 600V, 12 positions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTB4503:\u003c\/strong\u003e 45A, 600V, 3 positions. Wire range: 14–8AWG (2.5–10mm²)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCurrent Ratings:\u003c\/strong\u003e 15A, 25A, or 45A (model dependent)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 600V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePositions:\u003c\/strong\u003e 3, 4, 6, 8, or 12 (model dependent)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e Screw clamp (accepts solid and stranded wire)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHousing Material:\u003c\/strong\u003e Nylon PA66, flame retardant UL94 V-0\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e Panel mount (screw holes on base)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e UL 508, CSA C22.2\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBarrier Terminal Block vs DIN Rail Terminal Block\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBarrier terminal block (this product):\u003c\/strong\u003e Panel-mount with screw holes on the base. Fixed position — screwed directly to the panel or enclosure floor. Lower cost. Preferred for fixed installations where the terminal block position does not need to change. Common in North American electrical panels and junction boxes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIN rail terminal block (UK series):\u003c\/strong\u003e Clips onto 35mm DIN rail. Position can be changed by sliding along the rail. Higher cost. Preferred for European-style control panels and applications requiring flexible layout. Easier to add or remove terminals without drilling new holes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eWhat wire gauge does each TB series accept?\u003c\/h4\u003e\n\u003cp\u003eTB15 series (15A): 22–14AWG (0.5–2.5mm²). TB25 series (25A): 18–12AWG (0.75–4mm²). TB45 series (45A): 14–8AWG (2.5–10mm²). Always use wire rated for the circuit current — do not use undersized wire even if it physically fits in the terminal. The terminal block’s current rating assumes the wire is also rated for the same current.\u003c\/p\u003e\n\n\u003ch4\u003eCan I use jumper bars to connect adjacent positions?\u003c\/h4\u003e\n\u003cp\u003eYes. TB series terminal blocks accept standard jumper bars (bridge connectors) that link adjacent positions to the same potential. Jumper bars are available in 2–12 position configurations. Insert the jumper bar into the screw terminals of adjacent positions before tightening the screws. Jumper bars are useful for distributing a single supply to multiple circuits without running separate wires from the supply to each terminal.\u003c\/p\u003e\n\n\u003ch4\u003eDo I need wire ferrules with TB terminal blocks?\u003c\/h4\u003e\n\u003cp\u003eRecommended for stranded wire. Without ferrules, individual strands can escape the screw clamp area over time (especially with vibration), reducing contact area and increasing resistance. Use insulated wire ferrules (end sleeves) crimped onto stranded wire ends before insertion. Solid wire can be inserted directly without ferrules.\u003c\/p\u003e\n\n\u003ch4\u003eWhat is the torque specification for TB terminal block screws?\u003c\/h4\u003e\n\u003cp\u003eTB15 series: 0.5–0.6 N·m. TB25 series: 0.8–1.0 N·m. TB45 series: 1.2–1.5 N·m. Overtightening strips the screw head or cracks the terminal housing. Undertightening causes high resistance and potential arcing. Use a calibrated torque screwdriver for production installations.\u003c\/p\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrical panels:\u003c\/strong\u003e Power distribution connections in residential and commercial panels\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eJunction boxes:\u003c\/strong\u003e Field wiring termination for sensors, actuators, and power circuits\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMotor control:\u003c\/strong\u003e Power and control wiring connections in motor starter panels\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHVAC:\u003c\/strong\u003e Control wiring connections in air handling units and rooftop equipment\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndustrial machinery:\u003c\/strong\u003e Power distribution within machine enclosures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cp\u003eTB series dual-row barrier terminal block (model as selected above). Mounting screws included.\u003c\/p\u003e","brand":"Cable Parts Online","offers":[{"title":"TB-1503","offer_id":47850615144693,"sku":"14:100010417#TB-1503","price":1.58,"currency_code":"USD","in_stock":true},{"title":"TB-1504","offer_id":47850615111925,"sku":"14:202243813#TB-1504","price":1.68,"currency_code":"USD","in_stock":true},{"title":"TB-1505","offer_id":47850615079157,"sku":"14:2698718992#TB-1505","price":1.82,"currency_code":"USD","in_stock":true},{"title":"TB-1506","offer_id":47850615046389,"sku":"14:94#TB-1506","price":1.96,"currency_code":"USD","in_stock":true},{"title":"TB-1512","offer_id":47850615013621,"sku":"14:350850#TB-1512","price":2.98,"currency_code":"USD","in_stock":true},{"title":"TB-2503","offer_id":47850614980853,"sku":"14:350852#TB-2503","price":1.86,"currency_code":"USD","in_stock":true},{"title":"TB-2504","offer_id":47850614948085,"sku":"14:350853#TB-2504","price":2.14,"currency_code":"USD","in_stock":true},{"title":"TB-2505","offer_id":47850614915317,"sku":"14:10#TB-2505","price":2.42,"currency_code":"USD","in_stock":true},{"title":"TB-2506","offer_id":47850615374069,"sku":"14:29#TB-2506","price":2.66,"currency_code":"USD","in_stock":true},{"title":"TB-2508","offer_id":47850615341301,"sku":"14:173#TB-2508","price":3.57,"currency_code":"USD","in_stock":true},{"title":"TB-2510","offer_id":47850615308533,"sku":"14:175#TB-2510","price":3.68,"currency_code":"USD","in_stock":true},{"title":"TB-2512","offer_id":47850615275765,"sku":"14:193#TB-2512","price":4.24,"currency_code":"USD","in_stock":true},{"title":"TB-4503","offer_id":47850615242997,"sku":"14:366#TB-4503","price":3.47,"currency_code":"USD","in_stock":true},{"title":"TB-4504","offer_id":47850615210229,"sku":"14:496#TB-4504","price":3.57,"currency_code":"USD","in_stock":true},{"title":"TB-4506","offer_id":47850615177461,"sku":"14:771#TB-4506","price":4.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0732\/3494\/0149\/files\/S79a4e93ab8184509a9f7b2f69b00f406U.webp?v=1773899388","url":"https:\/\/www.csldmcml.com\/products\/dual-row-barrier-terminal-block-tb-series-15a-25a-45a-600v-3-12-positions-tb1503-tb2512","provider":"Cable Parts Online","version":"1.0","type":"link"}