E50RB Cutler-Hammer

E50RB Cutler-Hammer Motor Circuit Breaker

Brand：Cutler-Hammer Model number：E50RB

Country of origin: United States Product weight：0.55kg

HS code：8517623990

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Product Details：

Product Dimensions：

The E50RB is a modular operating head designed to be mounted on a standard E50 plug-in or non-plug-in limit switch body. It serves as the physical interface that interacts with moving machinery, converting linear or rotational mechanical force into rotational movement to actuate the internal switch contacts. The head features an adjustable side roller lever that can be rotated $360 \text{ degrees}$ around the shaft and extended or shortened to match the specific physical profile of the target cam or actuator. It is built from high-strength zinc die-cast alloy to withstand intense physical impacts and environmental stress common in heavy manufacturing.

Product Parameters

Product Family: E50 Heavy-Duty Plug-In Limit Switch Series
Component Type: Operating Head
Actuator Style: Adjustable Side Roller Lever
Roller Material: Typically steel or high-strength nylon depending on the specific subset code
Operation Direction: Configurable for clockwise, counterclockwise, or bi-directional (both directions) actuation
Torque to Actuate: Approximately $0.34 \text{ N}\cdot\text{m}$ ( $3 \text{ lb}\cdot\text{in}$ ) minimum return torque
Travel Characteristics: Pre-travel of approximately $5 \text{ degrees}$ , total travel of $90 \text{ degrees}$ , and a reset travel of $2 \text{ degrees}$
Enclosure Environmental Rating: NEMA 1, 3, 3S, 4, 4X, 6, 6P, 13 and IP67 when correctly assembled with a matching switch body and receptacle
Temperature Range: Standard operating limits from $-10\text{°C}$ to $93\text{°C}$ ( $14\text{°F}$ to $200\text{°F}$ )

Product Advantages

A primary advantage of the E50RB is its Exceptional Modularity. Because the head is completely separate from the switch body and wiring receptacle, it can be replaced in seconds by loosening a few captive screws, which eliminates the need to disconnect any electrical field wiring during maintenance. The High Adjustability of the side roller lever allows machine builders to fine-tune the physical contact point with the machine cam, accommodating minor mechanical tolerances or misalignments.

The Extreme Environmental Resistance provided by its viton gaskets and rugged sealing allows the head to operate reliably when completely submerged in water, water-soluble cutting oils, or coolants. Additionally, the Heavy-Duty Construction ensures a mechanical lifespan exceeding tens of millions of cycles under proper operating conditions.

Important Considerations and Precautions

When installing the E50RB, it is critical to ensure Cam Design Compatibility. The angle of the approaching machine cam should ideally be between $15 \text{ degrees}$ and $45 \text{ degrees}$ relative to the lever axis; an abrupt $90 \text{ degree}$ impact can snap the lever or shear the internal operating shaft. Over-travel Protection must also be monitored; while the head allows for a large total travel angle, allowing the machine cam to push the lever past its mechanical stop will cause immediate structural failure of the internal spring return mechanism.

During assembly to the switch body, make sure the Sealing O-ring is Correctly Seated and that the mounting screws are tightened uniformly; an unseated gasket will compromise the NEMA 4X/6P rating, allowing fluid ingress to short out the switch body contacts. Finally, avoid using the lever as a step or handle during machinery maintenance, as external human weight will bend the precision-ground shaft.

Product Applications

The Cutler-Hammer E50RB is utilized across heavy industrial sectors where rugged, physical position sensing is required.

Automotive Stamping and Assembly: Detecting the precise position of heavy stamping dies, shuttle conveyors, and overhead carrier frames.
Machine Tooling: Verifying tool turret rotation, slide positioning, and safety door closure on high-speed CNC mills and lathes.
Material Handling: End-of-travel limits and positioning on heavy duty conveyor belts, diverters, and sorting mechanisms in distribution centers.
Foundries and Steel Mills: Tracking ladle cars, rolling mill positioning, and heavy gate operations where extreme heat and dust are present.
Pulp and Paper Processing: Operating on wet-end machinery where continuous exposure to steam, moisture, and chemical washes would destroy standard proximity sensors.

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