UL 3410 Aramid-Braided Motor Lead Wire, 200°C 600 V

UL 3410 is an aramid-braided silicone motor lead wire for internal equipment wiring at up to 600 V. In the supplied large-conductor schedule, the UL 3410 configurations are 250, 350, 500 and 750 kcmil, each identified as a K-fiber construction. They carry a 200°C temperature rating in that schedule. A stranded tin-coated copper conductor is insulated with silicone rubber, then covered with a finished polyaramid braid. The covering is important: UL 3410 is not a fiberglass-braided wire, even though the source catalogue groups these large sizes alongside conventional SRML glass-braided motor leads. Related high-temperature cable constructions: High Temperature Cables.

Use this page when the equipment drawing specifies UL 3410, an aramid-covered motor lead or a large 200°C/600 V internal connection. The size table gives the strand count, nominal silicone and braid thicknesses, outside diameter and approximate weight for the four supplied kcmil sizes. Those physical dimensions matter when selecting conduit space, lug entry and the routing path. Temperature and voltage ratings do not by themselves establish suitability for an installation method or termination, so the equipment design remains the controlling selection document.

For smaller 150°C glass-braided leads, use the SFF-2 / SRML page. For a different 200°C glass-braided style, compare the UL 3074 200°C fiberglass-braided silicone wire. Specify the UL 3410 marking, conductor size, lead length and termination requirements in the RFQ.

UL 3410 layer sequence

1. Conductor: stranded, tin-coated copper in the supplied 250–750 kcmil configurations.
2. Insulation: extruded silicone rubber. Nominal insulation wall is 0.095 in for 250–500 kcmil and 0.110 in for 750 kcmil.
3. Covering: finished polyaramid (K-fiber) braid, nominally 0.040 in in the reference table. This is not fiberglass braid.

The official historical UL Style 3410 description requires a finished polyaramid braid over silicone insulation. It also specifies minimum average silicone wall by conductor size. The table below gives the supplied product dimensions, not a substitute for the marked product documentation.

Large high-temperature motor and equipment leads

UL 3410 is relevant to motor leads and internal appliance or industrial-equipment wiring where a 200°C, 600 V large-conductor lead and an aramid covering are specified. The braid provides a distinct construction option where a conventional glass-fiber finish is not the requested design. Select the conductor area for the actual circuit and termination, then check the finished OD against the equipment route and connection hardware.

UL's style description includes leads for hazardous-location motors as an intended use category. The wire's style marking alone is not an approval for an entire hazardous-area assembly or installation; the equipment and installation requirements still govern.

For a 150°C glass-braided lead wire in the supplied smaller AWG range, compare SFF-2 / SRML fiberglass-braided silicone lead wire. If the equipment drawing calls for several insulated cores in one 200°C cable, see SRG-K 200°C multicore silicone-aramid cable.

Motor leads that call for 1000 V AC at 150°C are covered separately by the UL 3580 silicone motor lead wire, with extruded silicone-rubber insulation and a detailed size table covering 26–6 AWG.

UL 3410 200°C, 600 V K-fiber configurations

Source reference dimensions are nominal. Thickness and OD are inches; weight is lb per 1,000 ft.

The official UL Style 3410 permits both 150°C and 200°C constructions; this table contains only the 200°C K-fiber rows identified in the supplied PDF. Smaller sizes from the same source are fiberglass constructions and are not presented as UL 3410 here.

Metric equivalents: values marked ≈ are approximate conversions of the supplied nominal inch and lb/1,000 ft data, rounded to 0.01 mm and the nearest kg/km. They are not independent manufacturing tolerances or newly measured specifications.

UL 3410

The product is UL-certified as Style 3410 for the specified configuration. UL 3410 is an Appliance Wiring Material style under UL 758 with a 600 Vac rating and a 150°C or 200°C rating according to construction. The 250–750 kcmil rows shown here are the 200°C aramid-braided configurations. The historical UL style description specifies extruded silicone rubber and a polyaramid braid with a silicone-, nylon- or acrylic-based finish.

Use the product marking and quotation to confirm the exact 200°C style and conductor size supplied.