Circuit Breaker Trip Unit
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This page explains how Current Transformer is classified within Electrical Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.
A device that transforms high primary current into a lower, proportional secondary current for measurement and protection purposes.
Technical details and manufacturing context for Current Transformer
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Rated Primary Current | 5–5000 A | Select based on max load currentIEC 61869-2 |
| Rated Secondary Current | 1–5 A | Standard output for meters and relaysIEC 61869-2 |
| Accuracy Class | 0.2–5P20 | Metering vs protection classIEC 61869-2 |
| Rated Burden | 2.5–30 VA | Must match connected loadIEC 61869-2 |
| Rated Voltage | 0.66–35 kV | System insulation levelIEC 61869-2 |
| Frequency | 50–60 Hz | Matching grid frequencyIEC 61869-2 |
| Thermal Short-Circuit Current | 10–50 kA | Withstands fault current for 1sIEC 61869-2 |
| Dynamic Short-Circuit Current | 25–125 kA | Peak withstand capabilityIEC 61869-2 |
| Insulation Class | E–H | Thermal endurance of insulationIEC 60085 |
| Operating Temperature | -40–85 °C | Ambient range for continuous operationIEC 61869-2 |
| Degree of Protection | IP54–IP65 | Dust and water ingress protectionIEC 60529 |
| Weight | 5–200 kg | Depends on voltage and current rating |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is essential for the following industrial systems and equipment:
| pressure: | Atmospheric to 1.5 bar (typical), up to 3 bar (special) |
| other spec: | Frequency: 50/60 Hz (standard), 16-400 Hz (special); Accuracy: Class 0.1 to Class 3; Insulation: 0.66 kV to 36 kV |
| temperature: | -40°C to +85°C (standard), up to +120°C (special) |
Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.
Quoted from the published standard.
12 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.
Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.
A practical evidence checklist for RFQ preparation and supplier evaluation.
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The current transformer senses the high current flowing through the main circuit and transforms it into a lower, proportional secondary current. This secondary current is used by the trip unit's electronic circuits to monitor the current level and initiate protective actions, such as tripping the breaker, in case of overcurrent or fault conditions.
Typical accuracy classes include 0.2, 0.5, 1, 3, and 5P20, as per IEC 61869-2. Class 0.2 is used for metering applications where high accuracy is required, while 5P20 is a protection class that ensures the transformer maintains accuracy up to 20 times the rated current. The specific class depends on the application.
The rated primary current should be selected based on the maximum load current expected in the circuit. It is recommended to choose a rating that is slightly higher than the maximum continuous load to avoid saturation, but also consider the short-circuit current withstand capability. Refer to the manufacturer's guidelines and the system design.
The primary standard is IEC 61869-2 for current transformers. Additionally, IEC 60085 defines insulation classes, and IEC 60529 specifies degrees of protection (IP ratings). These standards provide requirements for performance, safety, and environmental protection. Always verify compliance with the specific model.
Editorial classification, named public sources where available, and source-reviewed manufacturer records.
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