MODEL CODE: TORO-BOX-75X75P-4M-L125

High-Precision Toroidal Current Transformer (50A - 600A)

Manufactured in our 3,500 sq.ft. specialized Pune production facility, the TORO-BOX-75X75P-4M-L125 is a premium encapsulated low-tension current transformer. Specially engineered for electrical measuring instruments and protective relays, this model combines exceptional magnetic core linearity with robust mechanical insulation to withstand demanding industrial electrical environments worldwide.

TORO-BOX-75X75P-4M-L125 Current Transformer Isometric View Isometric Front View
TORO-BOX-75X75P-4M-L125 Encapsulated Side Layout Terminal & Enclosure Layout
TORO-BOX-75X75P-4M-L125 Technical Dimension Drawing Mechanical Dimensions (mm)
Engineering Specifications

Technical Parameter Data Sheet

Parameter Specification Value / Parameter Details
Primary Current Range 50 Amp to 600 Amp
Secondary Current Output 0.1 Amp or 0.2 Amp (Custom ratings on request)
Burden (VA Rating) 1.0 VA
Accuracy Class Class 1.0 High Precision
Rated Frequency 50 Hz / 60 Hz Universal Operation
Secondary Voltage 9.90 V – 10.10 Volt @ 100% rated load
High Voltage (H.V.) Test 2.0 kV AC between Primary and Secondary for 1 minute
Winding Insulation Class Class F Thermal Rating (155°C)
Frame / Case Insulation Class B Thermal Rating (130°C)
Operating Temperature -15°C to +70°C Continuous Ambient Range
Termination Type Fixed Nut-Bolt / U-Type Heavy-Duty Lugs (S1: Start, S2: End)
Mounting Configuration Standard Base Plate / Panel Mounting Slot Compatible
Performance Advantages

Key Applications & Features

The TORO-BOX-75X75P-4M-L125 series is optimized for high-power electrical circuits where current amplitude measurement demands zero core saturation under nominal loads and optimal signal fidelity.

Precision Metering: Designed for digital switchboard meters, power monitoring units, and energy management systems.
Relay Protection Integration: Ensures fast protection response during overcurrent and short-circuit faults in distribution panels.
Low Magnetic Flux Leakage: Seamless toroidal core topology delivers higher efficiency with near-zero acoustic noise and minimal vibration.
Custom OEM Manufacturing: Custom primary/secondary current ratios, special encapsulation materials, and lead lengths tailored for global buyers.

Quality Control & OEM Engineering Notes

  • ERDA Tested Design Integrity: Our current transformers are developed following stringent ERDA type-tested design protocols ensuring electrical breakdown tolerance up to 2kV.
  • Non-Standard Customization: In addition to standard ratios (50A to 600A), Torotrans manufactures custom primary tap ratios and special secondary voltage curves tailored to exact OEM client specifications.
  • Continuous Material Innovation: Figures provided in specification tables represent standard benchmark values. Batch routine test reports (RTR) are supplied with every export shipment upon request.

Request Custom Quotation or Technical Datasheet

Looking for volume pricing, customized secondary current outputs, or engineering samples for international projects? Connect directly with our technical sales team.

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