1A/5A Current Transformer – ACT-031 by Aim

Product Description

The ACT-031 is a 1A or 5A current transformer (depending on model) with 21mm x 31mm opening and an input rating of 200 – 400 Amps.

This current transformer measures the input amperage and outputs a corresponding 1A or 5A output. It is 1% accurate when used with a burden of 1.5 VA.  This low-cost current transformer provides multiple installation options for a durable installation with consistent output.  The ACT-031 has an opening of 31 mm x 21 mm.

The ACT-031 can operate from -15°C – 60°C and from 50-400 Hz. It is designed to withstand up to 3000 Vac.  The unit weighs 1.8 lbs (0.8 kg).

This current transformer provides a cost-effective way to monitor up to 400A.

Frequent Applications

  • Power meter
  • Switchgear
  • Distributed measurement systems
  • General Sets
  • Control panels

The ACT-031 complies with IEC 60044-1 and is CE approved and RoHS compliant.

Compatible meters accept a 5A input. They will show this symbol as the input:

AC Amperage

You can view all of our current sensors here.


  • Inner window is 31 mm x 21 mm.
  • 1% Accuracy Full Scale
  • Burden: 1.5VA
  • Standard: IEC60044-1
  • Withstand Voltage: 3000 Vac
  • Overload Withstand: 1.2 times rated current continuously
  • Operating Temperature Range: -15°C to 60°C
  • Frequency Range: 50-400 Hz
  • Weight: 0.8 kg / 1.8 lbs

Data Sheet

 Technical Specs


UL Registered


Made in Canada

ISO 9001

rohs compliant

Additional information

Weight1.8 lbs
Dimensions4.1 x 3.5 x 1.5 in
Output Signal

1A, 5A