Current Transformer CT-300

Name: Current Transformer CT-300
Brand: Load Controls LLC
SKU: CT-300
Price: 140.00 USD
Availability: InStock

$140.00

30% restocking fee applies to all returns | 12 Month Warranty

Current Transformer-300
Current Transformers accurately reduce high AC current levels to a safe, measurable output, enabling precise motor load monitoring, overcurrent detection, and seamless integration with Load Controls' power sensing solutions.

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A Current Transformer (CT) is an instrument transformer designed to produce a secondary current directly proportional to the current flowing through its primary, safely stepping down high AC currents from thousands of amperes to a standard output of 1A or 5A for accurate measurement and monitoring. Unlike voltage transformers, the CT's primary winding is connected in series with the current-carrying conductor, making it a non-invasive and reliable solution for measuring motor load without interrupting the circuit. Available in three configurations - wound, toroidal, and bar-type, Load Controls' current transformers work in conjunction with our full range of power sensors and load controls, providing the accurate current input signal needed for true power measurement across all industrial motor applications.

Three CT Types Available

Wound CT - primary winding connected directly in series with the conductor; magnitude of secondary current determined by turns ratio
Toroidal CT - no primary winding; current-carrying conductor threaded through the core window; split-core options available for easy installation without disconnecting the circuit
Bar-type CT - uses the actual cable or bus bar as the primary winding; fully insulated from high operating voltage and bolted directly to the current-carrying device

Key Specifications

Standard secondary output: 1A or 5A
Reduces high primary currents to safe, measurable secondary levels
Primary winding connected in series - non-invasive, no process interruption
Compatible with Load Controls' full range of power sensors and load controls
Split-core toroidal options available for retrofit installations without circuit disconnection

Important Safety Note - The secondary winding of a current transformer must never be left open-circuited while the primary is energised. Always short-circuit the secondary terminals before removing any connected instrument or load control.

Lead Time: 5 - 7 days
Product Weight: 54.4 Oz

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FAQs

Q: What is the difference between a wound, toroidal, and bar-type current transformer?

A wound CT has its primary winding physically connected in series with the conductor. A toroidal CT has no primary winding, the conductor is simply passed through its core window. A bar-type CT uses the main cable or bus bar itself as the primary winding, bolted directly to the current-carrying device.

Q: What is the standard secondary current output of a current transformer?

Current transformers are standardised to output either 1A or 5A on the secondary, regardless of the primary current level - allowing safe, accurate measurement with standard instruments and load controls.

Q: Can a current transformer be installed without disconnecting the circuit?

Yes. Split-core toroidal current transformers can be opened and installed around an existing conductor without disconnecting the circuit, making them ideal for retrofit installations on live systems.

Q: Why should the secondary of a CT never be left open-circuited?

When the secondary is open-circuited with primary current flowing, the transformer acts as a step-up transformer, generating dangerously high voltages on the secondary that can damage insulation or cause electric shock. Always short-circuit the secondary terminals before removing any connected load or instrument.

Q: How does a current transformer work with Load Controls' power sensors?

Load Controls' power sensors use the secondary current output of the CT as an input signal to calculate true motor power draw - providing accurate, real-time motor load monitoring without any direct contact with the high-voltage primary circuit.