Square D QOU135 - 35 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOU135 is a compact, dependable bolt-on molded case circuit breaker engineered to protect branch circuits inside panelboards and loadcenters. With a 35A rating at 120V and a single-pole design, this unit delivers clear, repeatable protection for residential, commercial, and light industrial installations that demand reliable circuit control without adding bulk.

• Bolt-on mounting for a rigid, vibration-resistant connection: The secure bolt-on interface reduces movement and arcing, keeping the bus connection solid in panels that experience vibration or rigid mounting requirements.
• Thermal-magnetic trip unit for stable protection: Combines precise thermal overload sensing with instantaneous magnetic trip action to respond quickly to short circuits, delivering predictable protection under varying load conditions.
• OEM-compatible design: Specifically engineered to pair with matching Square D OEM load centers and panelboards, ensuring a seamless fit, straightforward replacement, and maintained system integrity.
• Versatile for diverse settings: Suitable for residential spaces, small-to-medium commercial panels, and light industrial circuits where dependable branch-circuit protection matters most.
• Compact, single-pole configuration: 35A, 120V in a bolt-on molded case format that supports organized panel layouts and easy serviceability.

Designed to help electricians and facility owners reduce downtime and protect wiring and devices, the QOU135 delivers clear performance signals when protection is needed. Its thermal-magnetic mechanism provides repeatable trip characteristics, so you can trust it to respond correctly across a range of electrical loads without nuisance trips in normal operation.

Ideal applications and practical use cases

• Upgrading or replacing a worn-out breaker in Square D panelboards or loadcenters that require a 1-pole, 35A protection device.
• Installing on circuits that feed lighting, receptacles, or other branch loads within residential or light commercial panels where space and reliability are priorities.
• Use in environments where a secure, vibration-resistant connection is important to maintain consistent electrical contact and protective performance.
• Part of a matched protection strategy within OEM panels to preserve electrical reliability and ease of maintenance.

Key specifications at a glance

• Manufacturer: Square D
• Part Number: QOU135
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 35A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection