Westinghouse EHD1040 - Molded Case Circuit Breaker 40A 277V
Westinghouse EHD1040 - Molded Case Circuit Breaker 40A 277V

Westinghouse EHD1040 - Molded Case Circuit Breaker 40A 277V

Cutler Hammer
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The Westinghouse EHD1040 is a molded case circuit breaker designed to provide reliable overcurrent protection for industrial electrical systems. It features a 40A current rating and a 277V voltage rating, housed within a compact 100A frame measuring 3.38 in x 6 in x 1.38 in (LxHxW) and weighing 1.65 lb. Constructed with a thermal magnetic trip unit providing long-time and instantaneous (LI) protection, this single-pole, bolt-on breaker is CSA Certified, IEC Rated, and UL Listed for compliance. It is engineered for use in switchboards, motor control centers (MCCs) from Allen-Bradley, Eaton, and Rockwell Automation, and other enclosed control applications, with an interrupting capacity of 14kA at 480V and an operational temperature range of -25 to 70 °C (-13 to 158 °F).

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal Magnetic Protection, Long-Time and Instantaneous (LI) Trip
  • Voltage Rating: 277V AC
  • Current Rating: 40A
  • Dimensions: 3.38 in (Depth) x 6 in (Height) x 1.38 in (Width)
  • Standards: CSA Certified, IEC Rated, UL Listed
  • Applications: Allen Bradley MCC, Eaton MCC, Rockwell Automation Enclosed Control, Switchboards, Westinghouse Panels
  • Switch Type: Circuit Breaker
  • Configuration: Standard
  • Coil Voltage Maximum: Not Applicable
  • Temp Rating: -25 to 70 °C (-13 to 158 °F)
  • Shipping Dimensions: See Product Dimensions
  • Phase: 1
  • Voltage: 277V
  • Amperage: 40A
  • AIC rating: 14kA @ 480V
  • Connection: Bolt-On
  • Poles: 1
  • Protection: Thermal Magnetic
  • Functions: LI (Long-Time and Instantaneous Trip)
  • Frame Size: 100A/F
  • Trip Type: Thermal Magnetic
  • Panel Type: Allen Bradley MCC, Eaton MCC, Rockwell Automation Enclosed Control, Switchboard, Westinghouse
  • Breaker Type: Standard
  • Control Voltage Minimum: Not Applicable
  • Control Voltage Maximum: Not Applicable
  • MCM Size: Min. Wire Size 14 AWG, Max. Wire Size 1/0 AWG
  • Metal Type: Not Specified
  • Panel Style: Not Specified
  • Bus Type: Not Specified
  • Fuse Class: Not Applicable
  • Insulation Temperature: See Temp Rating
  • Inductance: Not Specified
  • Impedance: Not Specified
  • Barrels: Not Applicable
  • Class Rating: Not Specified
  • Diameter: Not Applicable
  • Velocity: Not Applicable
  • Clip Center: Not Applicable
  • Class: Not Specified
  • Mounting: Bolt-On
  • Hz: 50/60 Hz (Typical for Standards)
  • Coil Material: Not Applicable
  • Horse Power: Not Specified
  • Aux Contacts: Not Specified
  • CPT: Not Specified
  • Full Load Amps: See Current Rating
  • Dist Voltage: See Voltage Rating
  • Bucket Size: Not Specified
  • Bucket Style: Not Specified
  • Bucket Type: Not Specified
  • Full Load Amp Maximum: See Current Rating
  • Full Load Amp Minimum: Not Specified
  • Enclosure: Molded Case
  • Relay Style: Not Applicable
  • Coil Voltage Minimum: Not Applicable
  • Wire: See MCM Size
  • Amperage Maximum: 40A
  • Amperage Minimum: Not Specified
  • Nema Rating: Not Specified
  • Switch Style: Circuit Breaker
  • Wire Size: 14 AWG to 1/0 AWG
  • Certification: CSA Certified, IEC Rated, UL Listed
  • Circuit Breaker Mounting Style: Bolt-On
  • Terminal Connection: Load Side Lug
  • Frequency Rating: 50/60 Hz (Implied by Standards)
  • Phase Connection: A
  • Standards: CSA, IEC, UL
  • Compatible Frames: 100A/F
  • Installation Type: Bolt-On
  • Item QTY: 1
  • Nema Starter Size: Not Specified
  • Breaker Frame: 100A/F
  • Current Rating: 40A
  • Reverse Standoff Voltage: Not Applicable
  • Watts: Not Specified
  • Peak Pulse Current: Not Applicable
  • Breakdown Voltage (MIN VBR@IT ) (V): Not Applicable
  • Breakdown Voltage (VBR@IT) (V): Not Applicable
  • Polarity: Not Applicable
  • Operating Temperature Maximum Celsius: 70 °C
  • Max Clamp Voltage: Not Applicable
  • On-State Current: Not Applicable


Product Identification
  • UPC: 786679317358
  • GTIN: 00786679317358