Square D Q2M3100MB - 100 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Square D Q2M3100MB is a rugged 100A, 240V, three-pole bolt-on molded case circuit breaker designed to deliver reliable branch circuit protection in panelboards and load centers. Built by Square D, it combines a secure mounting method with precise thermal-magnetic protection to keep electrical systems safe and running smoothly.

Why this 3-pole bolt-on breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the busbar, reducing the risk of loose contacts and intermittent trips in environments with movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection across varying currents and temperatures, responding quickly to short circuits and sustained overloads.
• OEM-compatible designed to pair with matching Square D load centers and panelboards, ensuring seamless fit and dependable performance.
• Versatile for multiple sectors suitable for residential panel upgrades, commercial installations, and light industrial applications where robust overcurrent protection is essential.

Key specifications at a glance

• Manufacturer: Square D
• Part number: Q2M3100MB
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage rating: 100A
• Voltage rating: 240V
• Number of poles: 3
• Mounting style: Bolt-on
• Applications: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

• Upgrading or retrofitting residential main or subpanels that require solid 100A protection with a secure, bolt-on mount.
• New commercial installations where a robust, three-pole 240V breaker is needed to manage three conductors effectively and reduce wiring stress on the bus.
• Light industrial setups that experience vibration or movement, where a bolt-on connection minimizes loosening and maintains reliable protection.
• Replacement in OEM-compatible panelboards and load centers, ensuring a precise fit and consistent performance with existing protective devices.

Installation and practical considerations

Because this is a bolt-on MCCB, it requires a compatible panelboard or load center that supports bolt-on breakers. When installing, ensure proper torque on mounting screws to maximize the integrity of the bus connection, and verify trip settings are appropriate for the circuit’s load profile. This unit is designed for branch circuit protection, providing a clear fast-acting response during overloads or short circuits to protect wiring insulation and connected equipment.

What makes it a smart choice

• Durable construction tailored for dependable protection in everyday electrical environments.
• Precise thermal-magnetic trip performance that helps prevent nuisance trips while ensuring safety during faults.
• OEM-aligned compatibility simplifies procurement and stocking, reducing installation guesswork.
• Clear, unambiguous electrical ratings (100A, 240V, 3-pole) that fit common distribution schemes in homes and light commercial spaces.