Square D QOB340VH - 40 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB340VH is a 40A, 240V, 3-pole bolt-on molded case circuit breaker built to deliver reliable branch circuit protection in panelboards and loadcenters. With a rugged bolt-on mounting design and a thermal-magnetic trip unit, this breaker provides stable, repeatable protection performance for everyday electrical systems.

Key Features

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection that maintains lasting electrical integrity in challenging environments.
• Thermal-magnetic trip unit ensures stable, repeatable protection behavior, responding to both overloads and short circuits with precision.
• OEM compatibility designed to pair with matching Square D OEM load centers and panelboards for streamlined replacement and installation.
• Versatile utility suitable for residential, commercial, and light industrial applications where dependable overcurrent protection is essential.

Technical Specifications

• Manufacturer: Square D
• Part Number: QOB340VH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40 A
• Voltage Rating: 240 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal Use Scenarios

Perfect for upgrading or installing protection in panelboards and loadcenters where a reliable 3-pole solution is required. The 40A rating makes it well-suited for moderate-load circuits in homes, small-to-mid-size commercial spaces, and light industrial equipment setups. Its bolt-on design simplifies installation in panels that demand a secure, vibration-resistant connection, reducing the risk of loose bus bars and intermittent trips.

Installation and Practical Insights

Choose the QOB340VH when you need a durable, ready-to-use breaker that aligns with Square D’s OEM equipment. The bolt-on mounting provides a rigid connection to the bus, helping maintain consistent electrical performance even in environments with vibration or movement. The thermal-magnetic trip unit delivers prompt, reliable protection against both sustained overloads and short circuits, helping to safeguard wiring, outlets, and connected loads.

Compared to other molded case breakers, this model emphasizes compatibility and dependable protection in standard residential, commercial, and light industrial panel systems. When selecting a replacement or upgrade, ensure your panelboard or loadcenter is designed for 3-pole, 240V, 40A units to maximize safety and performance.