Overview
The Select 270 Series from Ohmite Manufacturing Co. includes RoHS-compliant, high-wattage power resistors designed for a variety of applications that need power ratings ranging from 12 to 1000 watts. Ideal for high wattage requirements, the 270 Type resistors are equipped with features that enhance their durability and performance, such as lead-free vitreous enamel coating and all-welded construction. Additionally, they possess a non-inductive design, ensuring minimal inductance.
Features
These resistors have terminals that are suitable for both soldering or bolt connection, making them versatile for different types of connections. The rugged coating is flame resistant, supporting safety in usage. Each resistor’s core is hollow, which allows for secure mounting using various methods such as spring-type brackets, thru bolts, or slotted-steel brackets.
Specifications
The datasheet details specifications such as wattage, ohmic values, dimensions including length, diameter, and core voltage. Available wattages span from 12W to 1000W with resistance values ranging from 0.1 ohms to 392K ohms, and the resistors come in several lengths and diameters. Electrical specifications include a temperature coefficient of +400 ppm/°C for 1 to 20 ohms and +260 ppm/°C for values above 20 ohms. Resistors also withstand overload conditions of 10 times the rated wattage for 5 seconds. Derating is linear from 100% at +25°C to 0% at +350°C. The dielectric withstanding voltage ranges from 1000 VAC for 12 to 100-watt resistors, up to 3000 VAC for 175 to 1000-watt resistors.
Ordering Information
The series includes standard part numbers for different standard resistance values, where the part number designation reflects the series, wattage, tolerance, and ohmic values. Tolerances are indicated as ±5% for parts over 19 ohms and ±10% for parts under 19 ohms. Furthermore, the 270 Type series offers made-to-order parts for specific requirements, and there’s a possibility to consult the factory for other sizes, non-inductive versions, and low-cost Centohm coating options.
Availability
RohS-compliant versions were available from January 2006 with an “E” suffix added to the part number to specify this feature. The datasheet advises reading further sections for complete details, such as “Resistor Terminals,” “Tubular Cores,” and proper selection of terminals and cores for custom configurations.
Contact Information
Ohmite Manufacturing Co. is located at 1600 Golf Road, Suite 850, Rolling Meadows, IL 60008. Contact options include a toll-free number, fax, official website, and an email address for further inquiries or support.
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