D-Curve Circuit Breakers | McMaster-Carr
Choose from our selection of D-curve circuit breakers, including over 650 products in a wide range of styles and sizes. Same and Next Day Delivery.
The ideal application is a circuit with a motor load. The K and D curve breakers are both designed for motor applications where ampacity rises quickly and momentarily during “start-up.” Both curves can “ride through” the momentary inrush of current and prevent nuisance tripping while providing protection to the circuit.
Our comprehensive inventory includes circuit breakers from major manufacturers, ranging from new to hard-to-find and used options. We provide a one-stop solution with our selection of miniature, molded case, and insulated case circuit breakers, as well as air breakers, vacuum breakers, load break switches, and related parts.
Refurbished circuit breakers are a cost-effective alternative to buying new ones. They are disassembled, cleaned, and tested to ensure they meet industry standards and are free of defects.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit. D-trip circuit breakers prevent nuisance tripping, so they are best for equipment that has a high spike in current at startup, such as transformers, power supplies, and heaters.
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