Westinghouse 1366D21G11 30A 3P 600V Circuit Breaker, Bolt-On | AmpState

The Westinghouse 1366D21G11 is a bolt-on circuit breaker built for reliable, everyday protection in panelboards, load centers, and electrical distribution systems. With a 30 A rating, 3 poles, and a 600 V capacity, this breaker provides precise, multi‑conductor interruption for three‑phase installations. It’s especially valuable for retrofit work and maintenance planning when you need a part number that stays consistent across replacements.

Key specifications

• Manufacturer: Westinghouse
• Part Number: 1366D21G11
• Amperage: 30 A
• Poles: 3
• Voltage: 600V
• Mounting: Bolt-On
• Applications: Circuit protection in panelboards, load centers, and electrical distribution

Why this matters for retrofit and maintenance

The bolt-on design delivers a secure, straightforward installation compatible with existing panel configurations that rely on this specific part number. Keeping 1366D21G11 in your inventory minimizes compatibility headaches during service calls, simple replacements, and upgrades where system continuity matters. The 3‑pole arrangement ensures all live conductors in a three‑phase circuit are simultaneously disconnected, enhancing safety during servicing and fault isolation.

Ideal use cases

• Retrofit projects where you must preserve the same part number for inventory consistency and panel compatibility
• Routine maintenance and planned replacements in commercial or industrial panelboards and distribution systems
• Spare-part strategies for service fleets, ensuring quick, reliable coverage when a 30 A, 3P, 600V breaker is needed
• Upgrading or upgrading-downing branch protections without changing the surrounding electrical architecture

Practical considerations and tips

When selecting this breaker, confirm that your panelboard or load center accepts a bolt-on, 3‑pole 600 V device and that the 1366D21G11 matches the required ampacity for the circuit it protects. For best results, pair this part with compatible Westinghouse components in existing installations to maintain consistent protection schemes across the distribution network. AmpState lists this part as available, and if you’re unsure about fit or compatibility, you can message the AmpState team for a quick confirmation.