Abb THN3365 400A 3-pole 600V Heavy Duty Safety Switch

Product Description

The ABB THN3365 is a heavy duty fusible safety switch rated for 400 amps, 3 poles, and 600 volts, housed in a NEMA 1 enclosure for indoor use. This disconnect switch is designed to isolate electrical circuits in commercial and industrial applications, providing a safe means of de-energizing equipment during service or maintenance. Licensed electricians install this switch as a service entrance disconnect or branch circuit isolation device where a reliable, code-compliant shutoff is required. The 600-volt rating makes it suitable for higher-voltage distribution panels and motor disconnect applications.

The THN3365 is used in indoor commercial and light industrial environments where a robust, fusible disconnect is needed. Typical installations include motor circuits, HVAC equipment disconnects, and panel feeder isolation. The NEMA 1 enclosure rating is appropriate for protected indoor locations free from excessive moisture, dust, and corrosive conditions. Electricians working on commercial build-outs, equipment room panels, and mechanical room disconnects commonly specify this switch.

Key Features

• 400-amp continuous current rating for high-load branch and feeder circuits
• 3-pole configuration handles three-phase power distribution
• 600-volt rating suitable for commercial and light industrial distribution systems
• Heavy duty construction for reliable long-term performance in demanding environments
• NEMA 1 enclosure provides protection in dry indoor installations
• Fusible design allows overcurrent protection to be integrated at the disconnect point

Compatibility

Designed as an OEM-style heavy duty fusible safety switch for use in 3-phase indoor commercial and industrial electrical distribution systems requiring a 400-amp, 600-volt, 3-pole disconnect.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize all upstream power sources and verify absence of voltage with a meter before beginning installation or service. Ensure the enclosure location meets NEMA 1 indoor environmental requirements and that fuse selection matches the connected load and conductor ampacity. Do not exceed the rated voltage or amperage of the switch.