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Square D TM40D-4P - Thermal Magnetic Breaker 40A 600V 4P

Square D
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The Square D TM40D-4P is a 4-pole thermal magnetic circuit breaker designed to provide reliable overcurrent and short-circuit protection for industrial electrical systems. It features a 600V AC voltage rating and a fixed 40A current rating, utilizing a compact LI (Long-time and Instantaneous) trip unit for coordinated protection. This unit is constructed for durability and is compatible with multiple Square D frame types including NS, NSF, NSX, NFNF, NFNL, NFHF, and NFHL. It is engineered to meet relevant industry standards for circuit protection devices. Typical applications include protecting feeders and branch circuits in industrial control panels, distribution boards, and machinery.

Key Features & Specifications
  • Type: Thermal Magnetic Circuit Breaker Trip Unit, Compact Family
  • Voltage Rating: 600V AC
  • Current Rating: 40A (Fixed)
  • Poles: 4
  • Protection: Thermal Magnetic with LI (Long-time & Instantaneous) Functions
  • Compatible Frames: NS, NSF, NSX, NFNF, NFNL, NFHF, NFHL
  • Weight: 2 lb


Product Identification
  • Manufacturer Part Number: TM40D-4P