An overload relay is designed to protect an AC motor from overheating by monitoring the current flowing to the motor. If the current exceeds the amperage set point for a specific period of time, the relay trips and sends a signal to turn the motor off. NEMA overload relays can be either melting alloy thermal trip or solid state by design.
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Digest 178 – NEMA and Definite Purpose Contactors and Starters
Motor Control, NEMA Products, NEMA Contactors, NEMA Starters – Definite Purpose, Duplex Motor Controllers, NEMA Overload Relays, Pump Panels, NEMA Contactors – Definite Purpose, Separate Enclosures / Replacement Parts, NEMA Contactors – Lighting, NEMA Contactors – Vacuum, NEMA Starters – Combination, NEMA Starters – Reduced Voltage, NEMA Starters – Vacuum, NEMA Starters/Protectors & Switches – Manual, NEMA Starters | Schneider Electric
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