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Allen Bradley 1321 Power Products 1321-3TH275-BB

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1321-3TH275-BB

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The Allen Bradley 1321-3TH275-BB is a robust three-phase isolation transformer designed for industrial applications. Featuring a power rating of 275 kVA, it operates consistently at a primary and secondary voltage of 460V AC across a frequency of 60 Hz.

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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 1321-3TH275-BB

ManufacturerAllen Bradley
Product TypeIsolation Transformer, Three-Phase
Product Line1321 Power Products
Part Number1321-3TH275-BB
Weight32.00 lbs (14.51 kg)
UPC662453986357
Power Rating275 kVA
Primary Voltage460V AC
Secondary Voltage460V AC
Number of Phases3-phases
Frequency60 Hz
Winding TypeDelta Primary / Wye Secondary
Enclosure RatingNEMA 3R (IP32)
Impedance4% to 6%
Efficiency98%
Conductor MaterialAluminum
Voltage TapsTwo 2.5% FCAN and Two 2.5% FCBN
Overload Rating150% for 60 seconds or 200% for 30 seconds
Duty CycleOne start per 2 hours
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The Allen Bradley 1321-3TH275-BB isolation transformer is engineered for three-phase power distribution, rated at 275 kVA. Both the primary and secondary voltage level is set at 460V AC, and the device functions effectively within a frequency range of 60 Hz. It utilizes a delta configuration for the primary winding while employing a wye configuration for the secondary winding.

Constructed to meet NEMA 3R standards (IP32), this unit is protected against harsh conditions, making it suitable for outdoor applications. Its impedance specification ranges from 4% to 6%, allowing for effective load handling through the transformer. Additionally, it boasts a high-efficiency rating of 98%, ensuring minimal energy loss during operation.

The 1321-3TH275-BB uses aluminum as the conductor material, which is a lightweight and effective option for electrical transmission. It includes two voltage taps for adjustments, specifically two at 2.5% FCAN and another two at 2.5% FCBN, allowing for flexibility in different setups. The overload capabilities allow for operation at 150% for up to 60 seconds or 200% for brief intervals of 30 seconds, accommodating transient conditions in power demand. The operating duty cycle permits one start every two hours, making it suitable for varied operational profiles while maintaining reliability throughout its usage.