Cooper Bussmann 16303-3 Power Distribution Block 310A 3P

Product Description

The COOPER BUSSMANN 16303-3 is a 3-pole thermoplastic power distribution block rated for 310 amps and 600 VAC/VDC. It accepts both copper and aluminum conductors in the primary and secondary positions, covering a wire range of 350 kcmil through 6 AWG on both sides. The block provides a single primary connection point and is built for use in panel boards, motor control centers, and industrial enclosures where reliable high-current distribution is required. Licensed electricians and panel builders install this component as part of branch circuit distribution assemblies. The thermoplastic housing resists moisture and offers solid dielectric performance at rated voltage.

This distribution block is suited for commercial and industrial electrical installations where a centralized termination point is needed for high-ampacity feeders. It handles both copper and aluminum conductors without adapter hardware, making it practical for mixed-wiring situations common in retrofit and new construction work. The 3-pole configuration supports three-phase distribution directly from a single block. Enclosure panel builders and electrical contractors working on motor control centers, switchboards, and large distribution panels will find this block a standard fit for 310-amp service applications.

Key Features

• 310-amp continuous rating at 600 VAC/VDC
• 3-pole design supports three-phase branch distribution
• Accepts 350 kcmil through 6 AWG copper or aluminum conductors on both primary and secondary sides
• Thermoplastic housing provides durable electrical insulation
• Single primary connection with one secondary connection per pole
• Meets CE, CSA, and UL 1059 standards for broad compliance

Compatibility

Designed as an OEM-style replacement or new-installation component for 600V-rated panel boards, motor control centers, and industrial distribution enclosures requiring 3-pole, 310-amp power distribution blocks.

Installation Notes

Installation must be performed by a qualified electrician in accordance with applicable NEC requirements. De-energize and lock out the panel or enclosure before making any connections. Verify that conductor sizes fall within the rated 350 kcmil to 6 AWG range and that aluminum conductors are prepared with appropriate anti-oxidant compound per local code requirements. Confirm enclosure dimensions accommodate the block footprint before mounting.