Siemens NGB3B025B - 25 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens NGB3B025B is a 25A, 600V, 3-pole bolt-on molded case circuit breaker designed to shield panelboards and load centers from overcurrent and short circuits. Its secure bolt-on mounting yields a rigid, vibration-resistant bus connection that stays tight even in busy electrical rooms, while the thermal-magnetic trip unit delivers fast, stable protection that adapts to both sustained overloads and sudden faults.

Designed for seamless integration with matching Siemens OEM load centers and panelboards, this breaker is a practical choice for residential, commercial, and light industrial applications where dependable branch protection matters.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid bus connection and excellent resistance to vibration, reducing the risk of loose connections that can cause heat or nuisance trips.
• Thermal-magnetic trip unit combines precise thermal overload protection with instantaneous magnetic trip for short circuits, ensuring predictable, repeatable performance.
• 3-pole design covers three-phase circuits common in commercial and light industrial panels, enabling coordinated protection for motor loads and equipment.
• 600V rating supports safe operation in medium-voltage distribution within panelboards and load centers.
• OEM compatibility ensures a perfect fit and coordination with Siemens panelboards, simplifying replacements and service upgrades.
• Residential, commercial, and light industrial suitability—a versatile choice across settings that demand reliable overcurrent and short-circuit protection.

Technical specifications at a glance

• Manufacturer: Siemens
• Part number: NGB3B025B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 25 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and recommendations

• Panelboards and load centers in homes, small businesses, retail spaces, and light industrial facilities that require reliable 3-phase protection.
• Replacement or upgrade in Siemens OEM panels to maintain system coordination and protective characteristics.
• Applications involving motors, compressors, and other loads with startup surges where a robust thermal-magnetic trip helps prevent nuisance trips while safeguarding equipment.

Practical installation tips

Before installation, ensure the panelboard is de-energized and the torque specifications for bolt-on mounting are followed. Align the breaker with the bus bars to avoid bending, and verify compatibility with your Siemens load center. For best results, use the exact NGB3B025B part in compatible Siemens panels to preserve protective coordination and warranty coverage.

Upgrade or stock up with the Siemens NGB3B025B from AmpState for dependable, industry-grade circuit protection that you can count on in demanding environments.