326 X open case

Artificial Resistive Load (326X)

Portable, Light weight Artificial Fixed Current Load Box

The TESCO 326X Artificial Resistive Load (Catalog No. 326X) is a modernized, field-ready load box designed for metering and utility testing environments that require single, fixed load up to  50A. Built on the same design principles as the 326P, the 326X provides the same rugged construction, portability, and reliability—now optimized for applications requiring a consistent, high-current load.

Weighing only 15 lbs., the 326X is one of the lightest artificial resistive load devices available, making it ideal for utility field personnel who need up to a 50A load performance without the bulk  of traditional load boxes. The unit supports multiple voltage inputs and retains the durable field-focused design TESCO is known for. As with all TESCO field instruments, the 326X is   engineered for long-term reliability under real-world operating conditions.

SKU: 326X Category:
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Description

Key Features:

  • Lightweight & Portable: Only 15 lbs., making the 326X extremely easy to transport, carry, and deploy in the field
  • Wide Voltage Compatibility: Supports 120V to 480V, covering common utility voltage scenarios.
  • Durable TESCO Construction: Engineered to withstand harsh field environments with the ruggedness expected of all TESCO equipment.
  • Industry Standard Design: A fixed-load variation of the long-standing TESCO artificial load line—maintaining trusted functionality while optimizing for simplicity.
  • Fixed High-Current Operation: Provides a single, fixed load up to 50A, ensuring repeatable performance for calibration, verification, and diagnostic testing.
  • Modernized Build for Field Conditions: Updated to 21st-century standards with improved portability and durability.
  • Optional Accessories for Expanded Capability: Compatible with TESCO’s ecosystem of field tools including cable sets, click switches, field bags, and test plugs

Applications and Use Cases:

  • Standardized field testing requiring up to a single, fixed load up to 50A
  • Meter performance verification
  • Training and technician qualification
  • Diagnostic load application
  • General purpose utility load scenarios requiring a consistent high-current source.

Specifications

Category Details
Mechanical & Environmental
  • Dimensions: 11” × 7” × 10” (W × D × H)
  • Weight: 15 lbs.
Electrical & Power
  • Input Voltages: 120V / 240V / 277V / 480V
  • Load Output: Up to a 50A resistive load
Safety & Compliance
  • Standard TESCO rugged construction
  • Designed for field use
Included
  • Potential Cable Set: J-35-50C-BPLG (6 FT)
  • Current Cable Set: 921-0212 (50 FT)
Category Field Equipment – Artificial Resistive Load

Ordering Information:

  • Catalog Number: 326X
  • Included: 326X Artificial Resistive Load unit
  • Warranty: 1 Year (Contact your TESCO Sales Representative to inquire about our Diamond Level Support for extended warranty coverage).

Product Documents

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Disclaimer:

TESCO Metering reserves the right to modify product designs, specifications, features, and documentation at any time as part of our continuous improvement process. All information is provided “as is” and may change without prior notice. While TESCO® strives for accuracy, completeness, and technical reliability, customers should verify the latest product details before making purchasing or engineering decisions. For confirmation of current specifications or application suitability, please contact TESCO® directly.