SB421RG 30A, 240V, 3-Phase, 4-Wire Fusible Bus Plug

The SB421RG from GE’s Spectra Series is a rugged Fusible Bus Plug engineered for dependable 3‑phase, 4‑wire power distribution at 240V and 30A. Built to integrate with GE Spectra Series switchgear and bus systems, this component adds reliable protective functionality right at the source, helping your equipment stay protected and your wiring streamlined.

• Amp Rating: 30A
• Voltage Rating: 240V
• Phase: 3‑Phase
• System: 4‑Wire
• Type: Fusible Bus Plug
• Manufacturer: GE
• Series: Spectra Series

Key advantages of the SB421RG include built‑in fusible protection that helps prevent fault currents from propagating through the distribution network, reducing the need for separate protective devices and simplifying wiring in complex industrial layouts. The 30A, 240V 3‑phase, 4‑wire configuration makes it a precise fit for mid‑range industrial loads while maintaining compatibility with existing GE Spectra Series infrastructure.

Who is this ideal for?

• Electrical engineers and technicians upgrading or retrofitting GE Spectra Series panels, switchgear, or bus duct assemblies.
• OEMs integrating reliable 3‑phase, 4‑wire 240V protection into machinery and processing lines.
• Facility engineers seeking a compact, field‑ready solution for distributed protection on 3‑phase networks.

Practical use cases and scenarios

• Industrial automation and manufacturing lines where 3‑phase 240V service is common and protection needs to be close to the source.
• Retrofits of existing GE Spectra Series distributions where a fusible plug approach simplifies wiring and protection coordination.
• New equipment builds that require a dedicated, compliant fusible bus plug to meet safety and protection standards.

Why choose the SB421RG over alternatives? It’s purpose‑built for the GE Spectra Series ecosystem, offering a compact, reliable fusible solution that aligns with 3‑phase, 4‑wire architectures while delivering straightforward integration and protection in one component. If you’re designing or maintaining robust industrial power networks, this bus plug helps you maintain voltage integrity, protection coordination, and system reliability without overhauling your existing GE equipment.