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Clamp-on AC Current Transducer - 500 Amps 50/60Hz - (CT-353)
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Clamp-on AC Current Transducer - 500 Amps 50/60Hz - (CT-353)

The CT-353 is a rugged, self-powered 500A clamp-on AC current probe designed specifically for use with the ACR SRX3 Current Logger. Built for fast, non-intrusive installation in electrical panels, switchgear, and equipment disconnects, it enables safe current measurement without disconnecting conductors. Its hook-style jaw design allows technicians to easily clamp onto insulated conductors or suitably sized bus bars, making load studies and current profiling straightforward and efficient.

Key Features

  • 2-500 Amp measurement range
  • Self-powered from the measured conductor — no batteries, no external power
  • 33 mm (1.3") jaw opening
  • Accepts conductors up to 30 mm (1.18") diameter
  • Compatible with bus bars up to 63 × 5 mm (2.48 × 0.20 in)
  • Frequency range: 48–1000 Hz
  • CAT III 600V safety rating

Designed for use with the ACR SRX3 AC Current Logger.

SKU: 35-0049
$339.00 USD

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Description Specifications Documentation Q&A

The CT-353 is a 500 A clamp-on AC current transducer that provides a 0–5 VDC output for direct connection to the ACR SRX3 AC Current Data Logger.

This split-core probe enables non-intrusive measurement of AC current without disconnecting conductors. Completely self-powered from the magnetic field of the conductor it measures, the CT-353 requires no batteries or external supply—simplifying installation and increasing reliability in load study applications. Its hook-style jaw design allows technicians to clamp easily onto insulated conductors or suitably sized bus bars inside electrical panels, equipment disconnects, and distribution systems, even in confined spaces.

With a 10 mV DC per amp AC output (5 VDC at 500A), the CT-353 is matched to the SRX3’s 0–5 V input, providing accurate and stable current logging for load studies, energy analysis, and troubleshooting applications.

The probe accommodates insulated conductors up to 30 mm (1.18") in diameter and bus bars up to 63 × 5 mm (2.48 × 0.20 in), making it suitable for a wide range of commercial and industrial installations.

Rated 600V CAT III and built with rugged polycarbonate housing, the CT-353 is intended for reliable field use alongside the SRX3 in demanding environments.

Note:

  • A $40 USD shipping fee will be applied to this product.

Specifications

Electrical Specifications

  • Current Range: 5 A to 500 A AC
  • Operating Range: 2 A to 500 A AC
  • Output Signal: 0–5 VDC proportional output
  • Frequency Range: 48 Hz to 1000 Hz
  • Working Voltage: 600 Vrms
  • Common Mode Voltage: 600 Vrms
  • Overload Capacity: 700 A for 10 minutes ON, 30 minutes OFF
  • Output Accuracy: ±1% to ±5% of reading depending on current range

Mechanical Specifications

  • Clamp Opening: 1.3 in (33 mm)
  • Maximum Cable Diameter: 1.18 in (30 mm)
  • Maximum Bus Bar Size: 2.48 × 0.20 in (63 × 5 mm)
  • Cable Length: 5 ft insulated output cable
  • Dimensions: 7.68 × 2.6 × 1.34 in (195 × 66 × 34 mm)
  • Weight: 420 g (14.82 oz)
  • Housing Material: Polycarbonate UL94 V0 with fiberglass reinforcement

Environmental Specifications

  • Operating Temperature: -5°F to 122°F (-15°C to +50°C)
  • Storage Temperature: -40°F to 185°F (-40°C to +85°C)

Safety & Compliance

  • EN 61010-2-32 compliant
  • 600 V CAT III / 300 V CAT IV
  • Double insulated design
  • Electromagnetic compatibility compliant to EN 50081-1 Class B

Compatibility

The CT-353 is compatible with monitoring devices that accept a 0–5 VDC analog input, including the ACR SRX3 AC Current Logger.

Installation Notes

  • Large hook-shaped split-core jaw simplifies installation on larger conductors and bus bars
  • Suitable for commercial and industrial load monitoring applications
  • Self-powered from the monitored conductor
  • Designed for long-term AC current load profiling and energy monitoring

Documentation

For a product sheet, please click below for a pdf version.

Product Sheet

Q&A

How do I know if the 500 A range is right for my application?

With a range of 0-500 Amps, the CT-353 is well suited for many commercial and industrial circuits, feeder monitoring applications, and equipment load studies where operating currents may approach 500 A.

For best measurement resolution, the selected probe should generally be rated approximately 1.25× to 1.5× higher than the expected maximum operating current. If your application normally operates far below 500 A, a lower-range probe may provide improved measurement resolution. If currents may exceed 500 A, higher-range probes are also available.

ACR offers compatible current probes in multiple ranges, including:

If you are unsure which probe range is most appropriate, contact ACR for assistance selecting a suitable current transducer for your application.

Does the CT-353 require an external power supply?

No. The CT-353 is self-powered from the magnetic field generated by the conductor being monitored and does not require a separate external power source.

Is this probe compatible with my SRX3 AC Current Logger?

Yes it is. The CT-353 outputs a 0-5 Vdc signal which is compatible with the 0-5 Vdc input channels on the SRX3.

How does the CT-353 connect to the SRX3?

The probe connects directly to one of the SRX3’s 0–5 VDC input channels using its analog output leads.

Do I need to disconnect high voltage wiring to install the probe?

No. The split-core clamp-on design allows installation around an existing conductor without disconnecting wiring.

Can multiple probes be used together?

Yes. Multiple CT-353 probes can be connected to multi-channel loggers such as the SRX3 for monitoring multiple circuits or three-phase systems.

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Completely self-powered from the magnetic field of the conductor it measures, the CT-353 requires no batteries or external supply—simplifying installation and increasing reliability in load study applications. Its hook-style jaw design allows technicians to clamp easily onto insulated conductors or suitably sized bus bars inside electrical panels, equipment disconnects, and distribution systems, even in confined spaces.\u003c\/p\u003e\n\u003cp\u003eWith a 10 mV DC per amp AC output (5 VDC at 500A), the CT-353 is matched to the SRX3’s 0–5 V input, providing accurate and stable current logging for load studies, energy analysis, and troubleshooting applications.\u003c\/p\u003e\n\u003cp\u003eThe probe accommodates insulated conductors up to 30 mm (1.18\") in diameter and bus bars up to 63 × 5 mm (2.48 × 0.20 in), making it suitable for a wide range of commercial and industrial installations.\u003c\/p\u003e\n\u003cp\u003eRated 600V CAT III and built with rugged polycarbonate housing, the CT-353 is intended for reliable field use alongside the SRX3 in demanding environments.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eNote:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA $40 USD shipping fee will be applied to this product.\u003c\/li\u003e\n\u003c\/ul\u003e"}