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Square D TM40D-3P - Thermal Magnetic Trip Unit 40A 600V 3-Pole

Square D
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Square D TM40D-3P is a thermal magnetic circuit breaker trip unit designed for providing reliable overcurrent protection in industrial power distribution systems. It features a 600V AC voltage rating and a fixed 40A current rating, delivering both long-time and instantaneous (LI) protection functions through its compact, three-pole construction. Engineered for compliance with industry standards, this unit is designed for integration into compatible Square D circuit breaker frames including NS, NSF, NSX, NFNF, NFNL, NFHF, and NFHL series for panel and switchboard applications.

Key Features & Specifications
  • Type: Thermal Magnetic Trip Unit, Compact Family
  • Voltage Rating: 600V AC
  • Current Rating: 40A (Fixed)
  • Poles: 3
  • Protection: Thermal Magnetic
  • Functions: LI (Long-Time and Instantaneous)
  • Compatible Frames: NS, NSF, NSX, NFNF, NFNL, NFHF, NFHL
  • Item Subcategory: Trip Units & Programmers
  • Weight: 1 lb


Product Identification
  • Manufacturer Part Number: TM40D-3P