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Motor Starters

Motor starters are used to safely start, stop, and protect electric motors by controlling the power supply and providing overload protection. They typically include a contactor to handle the switching of high current and an overload relay to prevent motor damage due to excessive current draw. Motor starters are used in pumps, compressors, conveyors, and HVAC systems.

Available in manual or automatic configurations, they support both single-phase and three-phase motors.

Since 2005, LiveWire Electrical Supply has been providing quality parts and fast shipping for in-stock motor starters, including hard-to-find items. Need help finding products? For 24/7 sales assistance, call 1-650-692-0700.

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Frequently Asked Questions

LiveWire Electrical Supply is your trusted source for hard-to-find electrical supplies, offering a wide selection of circuit breakers, fuses, safety switches, and industrial control products—all ready to ship the same day. With real-time stock and price checks, you can easily find what you need at competitive prices, whether for residential, commercial, or industrial projects. Our experts are available to assist with part identification and technical support, while our expedited shipping options and free UPS Ground shipping on qualifying orders ensure fast delivery. For 24/7 assistance and personalized support, call 1-650-692-0700.

What are three phase motor starters?

Three-phase motor starters are control devices designed to start, stop, and protect motors operating on three-phase power. They include a contactor for switching all three phases simultaneously and an overload relay to protect the motor from sustained overcurrent. Commonly used in industrial and commercial applications for motors above 1 HP.

How long do motor starters last?

Motor starter lifespan depends on duty cycle, load conditions, and environmental factors. Under normal operation, magnetic starters typically last 1–2 million mechanical operations. Contact wear or overload relay failure are common end-of-life points. Regular maintenance can extend service life.

What is the difference between NEMA and IEC motor starters?

NEMA motor starters are built to standardized, broad-use ratings with higher safety margins and are typically larger and more durable. IEC starters are compact, modular, and rated for specific application classes (e.g., AC-3 for squirrel cage motors). NEMA is common in North America; IEC is used globally and often in OEM equipment.

How do you size a motor starter?

Sizing is based on the motor’s full-load current (FLC), voltage, and horsepower. Select a contactor with a current rating at or above the FLC and an overload relay adjustable within the motor’s current range. Reference NEC 430 and manufacturer tables for proper selection.

Can a motor starter be used with a variable frequency drive (VFD)?
No. VFDs have built-in switching and overload protection, making motor starters unnecessary. Installing a starter between a VFD and motor can interfere with VFD output and cause damage. Use a VFD-rated disconnect or contactor only on the line side if needed for isolation.

Shipping and Returns

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You may return items within 30 days of delivery for a refund. Please view our return policy here.

FREE Shipping on orders over $100

We offer one to five-day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s). Please view our shipping policy here.

Same-Day Shipping

We strive to ship out your items within one business day. The shipping process may take up to 5 business days on some occasions. Feel free to contact us if your order is time sensitive. Call 1-650-692-0700 or email [email protected] for help.

Limited Warranty

Warranty Gurantee
LiveWire certifies that every product shipped out of stock, by manufacturers and by fulfillment partners will be free of functional defects for one (1) year. If any part is found with functional defects during the warranty period, LiveWire will send out a replacement item for free. Warranty items must be returned to LiveWire for inspection and must be postmarked within the warranty period.

Contact our support team by emailing [email protected] or calling 1-650-692-0700 during normal business hours for help with your warranty claim.

Disclaimer: Livewire Electrical Supply is not affiliated with, authorized by, or acting as a representative for the brands showcased on our platform. Please be aware that products sold by Livewire Electrical Supply do not include the original manufacturer’s warranty. All trademarks, brand names, and logos featured on this website belong to their respective owners. It’s important to note that this website is not endorsed, sanctioned, or approved by any of the manufacturers or trademark holders mentioned.

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