Zinsco QB24370 - 70A, 3-Pole, Circuit Breaker

Meet the Zinsco QB24370—a 70A, 3-pole circuit breaker engineered for dependable overcurrent protection in demanding electrical distributions. With its three-pole design tailored for three-phase systems, this breaker delivers coordinated protection for feeders and loads across panelboards, switchboards, and control panels.

Designed for industrial, commercial, and OEM applications, the QB24370 simplifies protection strategy in distribution panels and motor control centers. It provides robust, reliable operation for high-current circuits, helping you minimize downtime and safeguard equipment such as motors, conveyors, HVAC gear, and large lighting installs.

• Three-pole design for balanced three-phase protection—safely guards all three phases with a single device.
• 70A current rating—well-suited for heavy-load feeders without unnecessary nuisance trips.
• Versatile application—fits standard distribution panels, switchboards, and control panel assemblies used in industrial and commercial settings.
• Streamlined protection—reduces wiring complexity and component count by combining multiple protective functions into one breaker.
• Durable construction for demanding environments—built to withstand the rigors of daily operation in distribution and motor control centers.

Key specifications

• Current rating: 70A
• Poles: 3-Pole
• Breaker type: Circuit Breaker

Ideal use scenarios

• Industrial motor control centers needing reliable three-phase protection for heavy equipment
• Panelboards and switchboards in manufacturing lines and processing facilities
• Commercial HVAC and large machinery feeders requiring robust overcurrent protection
• OEM equipment designs that require a compact, integrated three-phase breaker solution

Why choose the Zinsco QB24370? It delivers a purpose-built solution for three-phase circuits where dependable protection and quick fault clearance are critical. Instead of juggling multiple single- or two-pole devices, you get a single, coordinated breaker that protects all three phases, helping you maintain safer operation and faster restoration after a fault. Whether you’re upgrading existing distribution infrastructure or equipping a new installation, the QB24370 is a practical, high-value choice for reliable three-phase protection.