Square D DTU323 100A 3-pole Non-fusible Safety Switch

Product Description

The SQUARE D DTU323 is a non-fusible, general-duty safety switch rated for 100 amps across three poles, designed for use as a disconnect means in industrial and commercial electrical systems. It carries a NEMA 1 enclosure rating, making it suitable for indoor installations in clean, dry environments. The DTU323 is rated for 15 horsepower at single-phase 240 Vac and 30 horsepower at three-phase 240 Vac, handling a wide range of motor and equipment loads. Licensed electricians install this switch as a local lockable disconnect in compliance with NEC requirements for motor branch circuits and equipment disconnect applications.

The DTU323 is used in residential, commercial, and light industrial settings where a non-fusible indoor disconnect is required. Common applications include motor disconnects for HVAC equipment, air compressors, pumps, and other three-phase or single-phase machinery. Its 3PDT contact form and high amperage rating make it a practical fit for equipment panels and machinery disconnects where overcurrent protection is handled upstream by a breaker or fused panel. The NEMA 1 enclosure limits use to protected indoor locations free from dust, moisture, and corrosive environments.

Key Features

• Non-fusible design — overcurrent protection handled by upstream device
• 100-amp rating with 3-pole, 3PDT contact configuration
• NEMA 1 indoor enclosure for clean, dry installation environments
• Rated 15 HP at single-phase 240 Vac and 30 HP at three-phase 240 Vac
• Also rated 20 HP at 250 Vdc for both single- and three-phase configurations
• RoHS Compliant and UL Listed

Compatibility

Designed as an OEM-style replacement or new-installation non-fusible safety switch for indoor motor disconnect applications requiring a 100-amp, 3-pole NEMA 1 enclosure.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the upstream circuit before mounting or wiring the switch. Verify that the enclosure location is dry and protected from physical damage, as the NEMA 1 rating does not provide protection against moisture or dust. Confirm that upstream overcurrent protection is properly sized for the connected load, since this switch provides no internal fusing.