Eaton E50SB Limit Switch

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  • Eaton E50SB — NEMA Heavy-Duty Plug-In Limit Switch Body (DPDT)

    A modular, plug-in limit-switch body from the E50 series (formerly Cutler-Hammer), providing double-pole double-throw (DPDT) snap-action contacts in a die-cast zinc enclosure. Designed to be mated with a separate E50 operating head and receptacle for use in harsh industrial environments.

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    Key Technical Specifications

    表格

    Item	Specification
    Product type	Heavy-duty plug-in limit switch body (modular)
    Manufacturer	Eaton / Cutler-Hammer
    Catalog number	E50SB
    Contact arrangement	DPDT — 2 NO + 2 NC (snap-action leaf contacts)
    Thermal current	10 A
    Contact rating	10 A at 120/240 V AC pilot duty; 1 A at 125 V DC
    Max. system voltage	600 V AC
    Enclosure material	Die-cast zinc
    Gasket / seal	Viton® (standard, chemical-resistant)
    NEMA enclosure rating	Type 1, 3, 3S, 4, 4X, 6, 6P, 13
    Ingress protection	IP67
    Mounting	Universal US and DIN standard mounting holes
    Connection	Plug-in terminals (receptacle sold separately)
    Standards	UL listed, CSA certified, NEMA ICS 2
    Operating temp.	Typical −29 … +85 °C (consult catalog)
    Origin	Mexico

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    Advantages & Features

    • Modular plug-in design — head, body and receptacle are separate; swap heads or bodies on site without rewiring, and stock one body for many actuators.
    • DPDT snap-action contacts — positive, repeatable switching with long mechanical life; 2 NO + 2 NC gives redundancy and flexible control logic.
    • Harsh-environment rating — die-cast zinc housing plus Viton gaskets/boots resists cutting fluids, coolants, oils, washdown and chemical splash; NEMA 4X/6P and IP67 approved.
    • Universal mounting — both US and DIN hole patterns, making retrofit into existing machines straightforward.
    • Captive posi-drive screws and clearly terminal-labeled nameplate simplify wiring and reduce setup errors.
    • Industry-standard platform — E50 is a long-running Eaton/Cutler-Hammer line; widely supported and interchangeable across OEM and retrofit installs.
    • Field-repairable — only the failed module (head, body, receptacle) needs replacement, reducing downtime and spare-parts cost.

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    Typical Applications

    • Machine-tool end-of-travel, home-position and safety-gate limits
    • Conveyors, hoists, cranes and overhead-travel limit detection
    • Automotive assembly lines, stamping and welding cells
    • Food & beverage washdown areas (NEMA 4X / 6P)
    • Wastewater treatment, pulp & paper, and petrochemical areas
    • Material handling, elevators, overhead doors and heavy machinery
    • OEM machinery and replacement of aging Cutler-Hammer E50 / equivalent NEMA heavy-duty switches

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    Notes / Considerations

    • Body only — no operating head, lever, roller or receptacle included. You must order a compatible E50 head (e.g. E50RA, E50SA, E50DA) and a receptacle/connector (e.g. E50RA receptacle series) separately to build a complete switch.
    • The switch must be actuated by a mechanical cam or target on the moving machine; electrical ratings are for pilot-duty control circuits, not direct motor-line switching — use a contactor for motor loads.
    • Maintain the minimum pretravel / overtravel specified for the chosen head to avoid contact damage and ensure correct switching point.
    • For safety-related stop circuits, use the NC contacts and verify positive-opening contact design per ISO 13849; consult Eaton's safety-rated E50 options if needed.
    • Do not mount where vibration can cause false actuation; torque mounting screws to the recommended value.
    • NEMA 4X/6P rating requires the correct head and a properly sealed cable gland/receptacle — an improperly fitted connector will defeat the enclosure rating.
    • For DC switching, derate contacts per the catalog (DC arcs are more destructive than AC); add an RC snubber or diode for inductive loads.
    • Replace worn heads/levers periodically; the snap-action contact life depends on actuation frequency and load.