855-405/250-501

Current Sense Transformers Overview

The WAGO 855-405/250-501 is a plug-in current transformer designed for measuring alternating current in electrical systems. It features a primary rated current of 250 A and a secondary rated current of 5 A, with a rated power of 5 VA. The device operates within a frequency range of 50 Hz to 60 Hz and maintains an accuracy class of 1. It supports a highest voltage for equipment of 1.2 kVrms AC and functions within an operating temperature range of -5 °C to 50 °C.

Current Sense Transformers Feature Summary

• Plug-in design allows for easy installation on busbars without disconnecting the circuit
• Split-core construction facilitates measurement of existing conductors
• High insulation voltage rating ensures safety in medium-voltage applications

Current Sense Transformers Applications

• Electrical energy metering systems
• Industrial control panels
• Power distribution monitoring

Current Sense Transformers Procurement Notes

Verify that the specific part number matches the required primary current rating of 250 A and secondary output of 5 A. Confirm that the split-core aperture accommodates the diameter of the conductor being monitored. Ensure the accuracy class 1 specification meets the precision requirements of the connected measurement or protection devices before finalizing procurement.

Current Sense Transformers Selection Notes

Select this component when non-intrusive current measurement is required for conductors up to 250 A. The 5 VA burden capacity must be sufficient for the connected load impedance. Consider the physical dimensions of the split core to ensure it fits the available space around the busbar or cable. Verify that the operating temperature range aligns with the environmental conditions of the installation site.

Current Sense Transformers Part Context

This model belongs to WAGO's series of plug-in current transformers, which are engineered for straightforward integration into electrical infrastructure. These devices provide reliable signal conversion from high primary currents to standardized low secondary currents suitable for meters and relays. The series emphasizes ease of use through its snap-on mechanism, reducing installation time compared to traditional wound transformers.

Current Sense Transformers Replacement Considerations

When substituting this unit, ensure the replacement has identical primary and secondary current ratings (250 A / 5 A) and matching accuracy class. Verify that the new component's physical aperture size can accommodate the existing conductor. Check that the burden capacity and frequency response are compatible with the downstream instrumentation to maintain system accuracy.