Siemens SHJD69300NGT 300A 600V 3-Pole Bolt-On Circuit Breaker

Meet the Siemens SHJD69300NGT—a 300A, 600V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and load centers. With a thermal-magnetic trip unit, this breaker offers stable, repeatable protection performance against overloads and short circuits, so your electrical system stays safe and reliable under demanding conditions. The secure bolt-on mounting creates a rigid, vibration-resistant bus connection, reducing movement and arcing risks in installations subject to vibration or temperature cycling.

This MCCB is built for seamless integration with matching OEM Siemens load centers and panelboards, ensuring a straightforward installation and a guaranteed fit. Its robust construction and compatibility make it an ideal choice for residential, commercial, and light industrial applications where large-draw circuits require strong, dependable protection.

Why this breaker stands out

• Secure bolt-on mounting: Provides a rigid connection to the bus and panelboard, minimizing movement and arcing in vibration-prone environments.
• Thermal-magnetic trip unit: Delivers accurate overcurrent and short-circuit protection with fast, predictable trips.
• High-current capability: 300A rating supports sizable branch circuits and feeder protection in mid-sized panels.
• 600V rating: Suitable for many commercial and light-industrial distribution systems, broadening its applicability.
• OEM compatibility: Specifically designed to work with Siemens load centers and panelboards for reliable performance and effortless installation.

Technical snapshot

• Manufacturer: Siemens
• Part Number: SHJD69300NGT
• Type: Thermal-magnetic molded case circuit breaker
• Amperage: 300A
• Voltage: 600V
• Poles: 3
• Mounting: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

• Main distribution panels in small to mid-size commercial buildings requiring robust, reliable protection for large-draw circuits.
• Residential-commercial mixed-use installations needing a large-draw feeder with secure, vibration-resistant mounting.
• Light industrial panels subject to equipment-induced vibration that require a durable, dependable trip mechanism.
• Retrofits or upgrades in Siemens OEM panelboards to ensure compatibility and consistent protection behavior.

Installation and performance tips

To maximize longevity and protection accuracy, ensure proper torque on the bolt-on mounting hardware per Siemens’ installation guidelines, and verify the panelboard’s bus connection is clean and free of oxidation before mounting. Regularly inspect for signs of arcing or overheating in environments with vibration or temperature cycling. Pair this MCCB with matching Siemens accessories and enclosures to maintain UL-listed assembly integrity.