0857 OHMITE Linear Rheostat

Review OHMITE .0857 Spec. No. Model 12.5-ohm Max 30 Amps Current Linear Rheostat

The Ohmite Model R 12.5-ohm 30 Linear Rheostat is a versatile and precise electrical load adjusting device, designed for various applications where controlling current flow is essential. This rheostat, specifically the 12.5-ohm 30-watt variant, is manufactured by Ohmite, a renowned name in the electrical components industry.

This 30-watt rheostat boasts a resistance value of 12.5 ohms, making it suitable for applications requiring a specific resistance value. The 30-watt rating indicates the maximum power it can handle without causing damage to the component. The linear design of this rheostat ensures that the resistance value changes proportionally with the rotation of the shaft, providing a smooth and consistent current flow adjustment.

The housing of the Ohmite Model R 12.5-ohm 30 Linear Rheostat is made of high-quality, insulating material, designed to withstand the rigors of industrial environments. The device features a rotary shaft with a knob on its end, allowing for easy and intuitive resistance value adjustments. The knob is often baked enamel coated for added durability and a professional appearance.

The internal construction of the rheostat consists of a resistance wire wound on a ceramic drum. As the shaft is rotated, the resistance wire makes contact with the drum, adjusting the resistance value. The high-quality materials used in its construction ensure long-lasting performance and reliability.

The Ohmite Model R 12.5-ohm 30 Linear Rheostat is designed to operate within a specific temperature range to ensure optimal performance. It can typically handle temperatures between -20 C and 70 C. The device is also RoHS compliant, meaning it does not contain hazardous substances such as lead, mercury, cadmium, and others.

In summary, the Ohmite Model R 12.5-ohm 30 Linear Rheostat is a robust and reliable electrical load adjusting component, ideal for applications requiring precise current flow control. Its 12.5-ohm resistance value and 30-watt power handling capacity make it a versatile choice for various industries. With its linear design, high-quality construction, and temperature resistance capability, this rheostat offers smooth, consistent, and accurate current flow adjustments.

The Ohmite 0857 Model-R 12.5-ohm 30 linear rheostat is a variable resistor designed for use in various applications such as power control, current limiting, and voltage regulation. Let's discuss some of its pros and cons to help you make an informed decision.

1. Linear Resistance: The 30 watt, 12.5-ohm rheostat provides a linear resistance characteristic, which is ideal for applications requiring precise voltage regulation or current control.

2. Rugged Construction: The rheostat features a robust design with an epoxy-coated, laminated core, ensuring long-term reliability and durability.

3. Wide Operating Temperature Range: The device can operate effectively in a temperature range from -40 C to 125 C (-40 F to 257 F), making it suitable for use in various industrial environments.

4. Compact Size: With a compact size of 2.9 x 1.5 x 1 inches, the Ohmite 0857 Model-R is easy to install and integrates well into most applications.

5. RoHS Compliant: This rheostat is RoHS compliant, meaning it contains only minimal levels of restricted substances, making it environmentally friendly.

1. Limited Power Handling: With a maximum power rating of 30 watts, this rheostat may not be suitable for high-power applications.

2. Manual Control: As a linear rheostat, the resistance value can only be adjusted manually, which might not be ideal for applications requiring automatic resistance control.

3. Limited Resistance Values: The resistance value can only be adjusted within the range of 0-12.5 ohms, which might be limiting for specific applications.

The Ohmite 0857 Model-R 12.5-ohm 30 linear rheostat is a reliable and durable option for applications requiring precise voltage or current control in a compact size. Its rugged construction, wide temperature range, and RoHS compliance make it an excellent choice for various industrial applications. However, its limited power handling capacity and manual resistance control might make it unsuitable for high-power or automated applications.

If you're looking for a reliable and precise resistance control solution for your industrial application, the Ohmite 0857 Model-R 12.5-ohm 30 linear rheostat is a great choice. However, if you require higher power handling or automatic resistance control, you might want to consider other types of variable resistors or regulators.

Details:

Big Ohmite 12.5 ohm panel mount potentiometer, used in good condition.

specifications passivecompos:

• brand: Ohmite
• mpn: 0857
• mounting style: Panel Mount
• type: Potentiometer
• tolerance rating: 10
• termination style: Screw Terminals
• resistance rating: 12.5-ohms
• country/region of manufacture: United States

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• policy: no returns

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• category: Business & Industrial > Passive Components > Variable Resistors > Potentiometers

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• prices: $45.00–$125.99
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• sold #: 13
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• started: september 5, 2025
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