37023

Overview

The Simpson Electric 37023 is a three-phase donut-type current transformer designed for electrical measurement applications. It features a primary-to-secondary turns ratio of 300:5, enabling the conversion of high primary currents into standardized low-level secondary signals suitable for panel meters and protective relays. The unit operates within a frequency range of 50Hz to 400Hz and provides an accuracy class of 1 with a burden rating of 12.5 VA at 60Hz. Constructed with robust insulation capabilities, it supports a primary voltage rating of 300V and withstands 10kV full-wave impulse voltages. The physical design includes a 40mm window diameter for conductor passage and utilizes stud terminals for secure secondary connections.

Feature Summary

• Three-phase donut configuration for centralized current sensing
• High insulation strength with 10kV full-wave impulse rating
• Wide frequency operational range from 50Hz to 400Hz
• Standardized 300:5 output ratio for metering compatibility

Applications

• Integration with digital and analog panel ammeters
• Electrical protection relay circuits
• Industrial power distribution monitoring systems
• Energy management and billing metering infrastructure

Procurement Notes

Verify that the required accuracy class (Class 1) aligns with your specific metering or protection requirements. Confirm that the system frequency falls within the 50Hz to 400Hz operational range. Ensure the connected burden does not exceed the 12.5 VA limit at 60Hz to maintain specified performance. Check that the 40mm window diameter accommodates the maximum conductor size in your installation.

Selection Notes

Select this component when a three-phase donut transformer is required for 300A primary current measurement. The 300:5 ratio is standard for connecting to 5A input devices. Consider the 10kV impulse rating for environments with potential voltage transients. The stud terminal configuration dictates the wiring method for secondary connections. Verify mechanical fitment against the 96.01mm x 89.66mm footprint dimensions.

Part Context

Simpson Electric manufactures precision test equipment and panel instruments. The 37023 belongs to their line of current transformers, which are passive components used to step down high currents for safe measurement. These devices are integral to industrial instrumentation, providing isolation between high-voltage circuits and low-voltage monitoring equipment while maintaining signal integrity across varying load conditions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.