General Electric | AC421R | Fusible Bus Plug | 4-Pole

Meet the GE AC421R Fusible Bus Plug — a precise, 4‑Pole solution crafted for maintenance, retrofit, and replacement in compatible GE switchgear. Identified by the part number AC421R, this fusible bus plug gives technicians a clear, reliable reference for fit and performance, ensuring you stay on spec from procurement to installation.

Why the AC421R stands out

Designed to plug into GE bus assemblies that require a four‑pole fusible path, this plug delivers the essential conduction and protective characteristics in a compact, plug‑in format. The 4‑Pole configuration supports proper phase alignment and current handling in multi‑pole switchgear setups, helping you preserve original electrical protection schemes.

• Exact compatibility with GE equipment — rely on the part number AC421R as the definitive reference for matching hardware.
• Maintenance-friendly — swap‑in replacements during service windows to minimize downtime.
• Retrofit-ready — add or restore 4‑pole protection in existing switchgear without a full redesign.
• Replacement-ready — ideal when renewing fusible bus plugs that wear over time, keeping your protection intact.

Use cases and practical applications

- Routine maintenance on GE switchgear that utilizes fusible bus plugs in a 4‑pole configuration.

- Retrofit projects to restore or upgrade to a 4‑pole fusible path without changing the overall footprint.

- Replacement scenarios following fusible element wear or failure, ensuring continued safety and reliability with GE‑spec parts.

What to check before ordering

• Confirm fit and ratings before ordering — AC421R is the most reliable compatibility reference for your gear.
• Verify the four‑pole configuration matches your bus assembly requirements.
• Ensure your equipment model and documentation align with the GE part number AC421R.

Installation and maintenance tips

Power down equipment following your site’s lockout/tagout procedures. Align the AC421R fusible bus plug with the bus assembly footprint, insert fully, and secure per your GE equipment’s assembly instructions. After installation, perform a functional check and verify continuity across all four poles as part of routine maintenance audits.

Designed for professionals who value precise GE compatibility, dependable performance, and straightforward procurement, the AC421R is the pragmatic choice for fleets and facilities that prioritize uptime and adherence to original protection standards. If you’re stocking for service readiness or planning a retrofit that preserves the intended protection scheme, this 4‑pole fusible bus plug is the right fit.