EATON CUTLER HAMMER EHD3040L EHD14K Product Description

Overview

EATON CUTLER HAMMER EHD3040L EHD14K is an Eaton Cutler-Hammer Series C F-frame molded case circuit breaker for three-phase electrical branch, feeder, motor or panel protection. The catalog number EHD3040L identifies an EHD type, three-pole, 40 A complete breaker with line-and-load terminals. The designation EHD14K corresponds to the breaker interrupting capacity family, with 14 kAIC at 480 V AC listed in the Eaton product record. The unit is used as a replacement molded case circuit breaker spare in existing Eaton or Cutler-Hammer panel and motor control installations.

Features

The EHD3040L is a complete F-frame Series C breaker with fixed thermal, fixed magnetic trip type. Eaton lists the trip type as T186 and the circuit breaker frame as a complete breaker. It is rated 40 A, three-pole, for 50/60 Hz operation. Interrupting rating is 18 kAIC at 240 V AC and 14 kAIC at 480 V AC per the Eaton specification.

Terminals are line and load. The breaker is UL Listed per the Eaton product record. Public distributor records for the EHD breaker family also list voltage classes including 240 V AC, 480 V AC and 250 V DC for related EHD models; the exact DC application rating should be verified from the Eaton specification sheet or breaker label for the installed unit.

Eaton lists the breaker dimensions as approximately 3.38 in depth or length, 5 in height, 4.13 in width, and weight 4.5 lb. The Eaton warranty policy covers the product from installation date or shipment date according to Eaton Selling Policy 25-000; installed spare units should be inspected for condition, trip operation, terminal condition and marking before service.

Specs

Brand: EATON, Cutler-Hammer Series: Series C molded case circuit breaker Catalog number: EHD3040LCapacity designation: EHD14KBreaker type: EHDFrame: F-frameBreaker frame type: Complete breaker Number of poles: Three-poleAmperage rating: 40 ATrip type: Fixed thermal, fixed magnetic; Eaton trip reference T186Frequency rating: 50/60 HzInterrupt rating: 18 kAIC at 240 V AC; 14 kAIC at 480 V ACTerminals: Line and load Certification: UL ListedDimensions: Approximately 3.38 in × 5 in × 4.13 in, depth or length × height × width Weight: 4.5 lbRelated EHD voltage references: 240 V AC, 480 V AC, 250 V DC; DC rating for this exact breaker requires label or Eaton sheet verification Product status: Replacement molded case circuit breaker spare for existing Eaton Cutler-Hammer installations

Principle

The molded case circuit breaker protects conductors and connected equipment from overcurrent and short-circuit conditions. The thermal trip element responds to sustained overload current, providing inverse-time protection as the breaker heats with load current. The magnetic trip element responds rapidly to high short-circuit or instantaneous overcurrent, tripping the breaker to isolate the faulted circuit.

The three-pole breaker opens all three phase conductors when the thermal or magnetic mechanism trips. Line terminals connect to the supply side, and load terminals connect to the protected feeder, branch circuit, motor starter or panel load. The fixed thermal and fixed magnetic trip characteristics are matched to the breaker frame and amperage rating, so replacement should match pole count, amperage, frame type, voltage class, interrupting rating, terminal arrangement and any equipment-specific HACR or motor application requirement.

Replacement should verify the original breaker catalog number, pole count, trip rating, voltage and DC or AC application, available short-circuit current, terminal lug or feeder compatibility, panel mounting arrangement, wire size and torque, and whether the application requires HACR or reverse-feed use. Circuit breaker replacement in energized or panel-mounted equipment should be performed by a qualified electrician according to local electrical codes and equipment documentation.

Applications

EATON CUTLER HAMMER EHD3040L EHD14K is used for three-phase panelboard, feeder, branch circuit, motor control center, starter disconnect, machinery disconnect, industrial control panel, commercial building distribution, HVAC equipment, pump and motor branch protection, process equipment and general low-voltage power distribution. It protects feeders, motors, control circuits and connected loads in existing Eaton or Cutler-Hammer Series C F-frame installations. In legacy panels and motor starters, the breaker serves as a direct replacement spare when the original frame, rating, interrupting capacity, terminals and application match.