7SHT-301

Current Sense Transformers Overview

The Sifam Tinsley Instrumentation Inc. model 7SHT-301 is a single-phase current sense transformer designed for chassis or foot mounting applications. It features a primary-to-secondary current ratio of 300:5 A, supporting a primary current capacity of 300 A with a secondary output of 5 A. The device operates within a frequency range of 50 Hz to 400 Hz and is rated for indoor use. Key electrical specifications include a 10 kV basic insulation level (BIL) and a 60 Hz nominal system frequency compatibility. The unit is constructed for robust industrial environments, providing reliable signal isolation and transformation for metering and protection circuits.

Current Sense Transformers Feature Summary

• Provides precise current transformation with a fixed 300:5 A ratio for accurate measurement
• Supports wide frequency operation from 50 Hz to 400 Hz for versatile system integration
• Features high dielectric strength with a 10 kV basic insulation level for safety
• Designed for secure chassis or foot mounting in industrial control panels

Current Sense Transformers Applications

• Industrial power monitoring systems requiring isolated current sensing
• Electrical protection relay input circuits for motor and feeder protection
• Energy metering installations in commercial and industrial facilities
• Control panel integration for AC current measurement up to 300 A

Current Sense Transformers Procurement Notes

Verify the specific mounting configuration required, as sources indicate both chassis and foot mount variants exist for this series. Confirm that the application environment remains indoors, as outdoor ratings are not specified. Ensure the system frequency falls within the 50 Hz to 400 Hz operational range. Check that the primary current does not exceed 300 A continuous rating. Validate that the 10 kV BIL meets the insulation requirements of the installation voltage class.

Current Sense Transformers Selection Notes

Select this component when a fixed 300:5 A ratio is necessary for standard metering or protection devices. Consider the physical dimensions and mounting style to ensure compatibility with existing panel layouts. Evaluate the frequency range against the source system to avoid saturation or accuracy loss at higher frequencies. Compare the 10 kV BIL against other available options if higher insulation levels are required for specific grid conditions.

Current Sense Transformers Part Context

The 7SHT-301 belongs to the 7SHT series of current transformers manufactured by Sifam Tinsley Instrumentation Inc. This series is part of the company's broader portfolio of instrument transformers and electrical sensing solutions. The brand has a long history in providing analog and digital instrumentation for various sectors, including power, manufacturing, and automotive industries. This specific model represents a traditional electromechanical solution for current isolation.

Current Sense Transformers Replacement Considerations

Direct substitutes may include models from Instrument Transformers Inc. offering identical 300:5 A ratios and similar mounting styles. Verify dimensional compatibility before replacement, as depth and width vary between manufacturers. Ensure the replacement unit supports the same 50-400 Hz frequency range and 10 kV BIL rating. Cross-reference ANSI standards compliance if the original equipment was specified under those guidelines.