Fusible Disconnect Switch · 30A 240V AC 3-Pole NEMA 1 Fusible with Neutral · Eaton DG321NGB

What this product is for

This fusible safety switch is used to manually isolate 240V AC circuits for servicing, lockout procedures, and local disconnecting means in commercial and light industrial installations. It is a 3-pole, 4-wire general duty switch with a neutral and provision for Class H cartridge fuses.

Use for

Use for equipment isolation on 240V AC systems, light duty motor circuits where the application matches the switch rating, and indoor installations requiring a general duty fusible disconnect. Typical applications include small machinery, HVAC equipment, and distribution disconnect points in dry indoor electrical rooms.

Avoid for

Avoid using this switch outdoors or in washdown, corrosive, or wet locations because it has a NEMA 1 indoor enclosure. Do not use where a higher voltage rating, heavier duty enclosure, or fuse class other than the listed Class H provision is required.

Best for

Best for electricians and maintenance teams needing a compact indoor fusible disconnect with neutral for 240V AC 3-pole applications. It suits projects where straightforward circuit isolation, common cartridge fuse protection, and a compact enclosure are the main buying factors.

Installed in

Typically installed surface-mounted in indoor commercial buildings, service areas, mechanical rooms, manufacturing spaces, and similar dry locations. Enclosure size is approximately 10.69 in H x 6.38 in W x 6.88 in D (271 x 162 x 175 mm), which helps when planning wall space and conduit entry.

Why this product exists

This switch provides a visible, code-oriented means of disconnecting power while allowing branch protection through cartridge fuses. The fusible design helps coordinate equipment protection and isolation in one assembly, reducing the need for separate disconnecting hardware in suitable applications.

Compared with similar products

Compared with a non-fusible disconnect, this model adds fuse provision for overcurrent protection at the switch. Compared with heavier duty safety switches, this general duty model is intended for indoor applications with more basic environmental requirements. As typical guidance, general duty safety switches are commonly used for commercial and light industrial branch isolation, but final selection depends on fault current, fuse selection, equipment nameplate data, and local electrical code.

Specifications

• Manufacturer: Eaton
• Part number: DG321NGB
• Product type: General duty cartridge fuse safety switch
• Amperage: 30A
• Voltage rating: 240V AC
• Poles: 3
• Wiring: 4-wire
• Fuse configuration: Fusible with neutral
• Fuse class provision: Class H fuses
• Enclosure rating: NEMA 1 indoor
• Enclosure material: Painted steel
• Mounting: Surface
• Compliance note: NEC 230.62(C) compliant barrier listed by manufacturer
• Certification: UL Listed
• Approximate dimensions: 10.69 in x 6.38 in x 6.88 in (271 x 162 x 175 mm)
• Approximate weight: 6 lb (2.7 kg)

Actual suitability depends on available fault current, fuse selection, conductor sizing, installation conditions, and local electrical code.