CUTLER-HAMMER HMCPS030H1C Product Description

Overview

CUTLER-HAMMER HMCPS030H1C is an Eaton Cutler-Hammer HMCP Series C motor circuit protector, also referenced as HMCP030H1C. The unit is a three-pole instantaneous-only molded case circuit breaker used for short-circuit protection of motor circuits, typically applied together with an external motor overload relay. It is rated 30 A continuous current for 600 V AC maximum motor branch circuits and is intended for use with electric motor starters in industrial control centers, motor control panels and machine control circuits. The HMCPS catalog configuration corresponds to the HMCP breaker variant in the Cutler-Hammer Series C motor protector family, used as a replacement breaker spare in existing Eaton or Cutler-Hammer motor installations.

Features

CUTLER-HAMMER HMCPS030H1C provides 3-pole motor circuit protection with an instantaneous magnetic trip function. The breaker is rated 30 A continuous and operates on a maximum 600 V AC system, with DC application at 250 V DC maximum per the HMCP product range. The HMCP motor protector is designed for short-circuit protection rather than overload protection; overload protection is normally supplied by a separate motor overload relay or starter thermal unit. The instantaneous trip setting for the HMCP030H1C breaker is selected by cam position and covers magnetic trip ranges from 90 A to 300 A, depending on the selected setting and motor full-load current range.

The breaker belongs to the Series C HMCP family and uses an F-frame construction according to distributor and breaker catalog data. Line and load connections use breaker terminals suitable for motor branch wiring; terminal material is listed as non-aluminum in distributor specifications. The product complies with UL 489, CSA C22.2 No. 5.1 and IEC 157-1 requirements, and the breaker nameplate carries the applicable CE marking. It is listed as a recognized component under UL File E7819 for motor circuit protector application. Interrupting ratings depend on the motor starter combination used with the breaker.

Specs

Brand: Eaton Cutler-HammerModel: CUTLER-HAMMER HMCPS030H1CRelated catalog reference: HMCP030H1CProduct type: Motor circuit protector, molded case circuit breaker Series: Series C HMCPFrame: F-frameNumber of poles: 3-poleContinuous current rating: 30 AMaximum AC voltage: 600 V AC, 50/60 Hz Maximum DC voltage: 250 V DCProtection function: Instantaneous magnetic trip; magnetic only, no overload protection Trip setting type: Cam-adjustable instantaneous trip Magnetic trip range: 90 A to 300 A depending on selected setting NEMA starter application: Motor starter size 1 and related motor full-load current ranges Mounting: Panel or starter-mounted molded case breaker Terminal arrangement: Line and load breaker terminals, non-aluminum terminal material per distributor data Standards: UL 489, CSA C22.2 No. 5.1, IEC 157-1UL recognized component: UL File E7819Marking: CE on nameplate Interrupting rating: Dependent on matched motor starter combination Product status: Eaton Cutler-Hammer Series C motor protector, replacement breaker spare for existing motor control installations

Principle

CUTLER-HAMMER HMCPS030H1C operates as a magnetic-only motor branch protection breaker. Under normal motor starting and running current, the breaker permits the motor current to pass without tripping. The magnetic instantaneous trip element monitors circuit current and responds to short-circuit or high overcurrent conditions by releasing the breaker mechanism to open all three poles rapidly. The cam setting selects the instantaneous trip threshold to match the motor full-load current and starter application, so the breaker can carry normal starting current while tripping promptly on fault current.

Because the HMCP protector provides instantaneous short-circuit protection but not overload protection, it is normally paired with a separate motor overload relay or thermal starter unit that handles sustained overload and stalled motor conditions. The breaker contacts interrupt the motor branch circuit during a fault, and the breaker must be reset after the fault is cleared. Interrupting capacity is determined by the coordinated motor starter combination, so replacement should use the same breaker frame, pole count, current rating, trip setting and starter compatibility as the original Cutler-Hammer or Eaton installation.

Applications

CUTLER-HAMMER HMCPS030H1C is used in three-phase motor branch circuits for pumps, fans, compressors, conveyors, machine tools, mixers, crushers, material handling equipment, packaging machinery, production lines, motors in control centers, and industrial process panels. It fits motor starter combinations in MCCs, motor control panels, OEM machinery panels, utilities, water and wastewater, chemical and process plants, manufacturing facilities, and commercial electrical equipment. In existing Cutler-Hammer or Eaton HMCP breaker installations originally equipped with this protector, the unit serves as a direct replacement motor circuit breaker spare, compatible with the original panel mounting, starter combination, terminal wiring and trip setting arrangement.