Overview
The datasheet introduces the 270 Series of high wattage fixed resistors suitable for soldering or bolt connection. These resistors are designed for rugged applications, including high wattage requirements, with power ratings ranging from 12 to 1000 watts. The non-inductive versions are also available.
Features
Key features of the 270 Series include a rugged lead free vitreous enamel coating, all-welded construction, and core made of tubular ceramic. The resistors are RoHS compliant and feature terminals coated for soldering, with a flame resistant coating option available.
Specifications
Electrical characteristics include a linear derating from 100% at +25°C to 0% at +350°C, tolerances of ±10% under 1 ohm and ±5% for 1 ohm and over, and a temperature coefficient of +400 ppm/°C for resistances of 1 to 20 ohms and +260 ppm/°C for resistances above 20 ohms. The resistors also support an overload of 10 times the rated wattage for 5 seconds.
Mounting and Connection Options
Mounting is facilitated through the hollow core of the resistors, which can accommodate fastening with spring-type brackets, thru-bolts, or slotted-steel brackets. The lug terminals are suitable for soldering or sturdy bolt connections, with an optional “FFast on” connector, ensuring secure applications.
Durability and Compliance
In terms of durability, the power derating for high resistance values should be considered to enhance reliability. Furthermore, the resistors can withstand dielectric voltages between 1000 VAC for the 12 to 100-watt ratings and 3000 VAC for the 175 to 225-watt ratings.
Ordering Information
The ordering information section specifies that customers can select the power, resistance, wattage, and coating options when ordering, allowing for customization as per application needs.
Available Models
The datasheet lists models with resistance ranges from 0.1 ohms to 51K ohms for 1.75-inch models, up to 1.69-392K ohms for 20-inch models, accommodating various applications and power requirements.
Standard Part Numbers and Availability
A list of standard part numbers for 270 Series is provided for resistors with wattage ratings of 12 watts, specifying their resistance values. It mentions checking availability via the worldwide inventory search on the manufacturer’s website, with some values indicated to have a silicone-ceramic coating instead of vitreous enamel.
Contact Information
Contact details for Ohmite Manufacturing Company include a toll-free number, international number, fax number, website, and email address for further inquiries or support.
References:
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