The SCT-013-050 is a mid-range, split-core current transformer (CT) designed for non-invasive measurement of AC currents up to 50A. Like other voltage-output models in the SCT-013 series, this sensor includes an internal burden resistor. It converts the sensed current into a safe 0–1V AC output, allowing for easy integration with microcontrollers without requiring high-precision external resistors.

Specifications

• Rated Input: 0A – 50A AC
• Rated Output: 0V – 1V AC
• Internal Burden Resistor: Yes (Voltage output)
• Opening Size: 13mm x 13mm
• Accuracy: +/- 1%
• Dielectric Strength: 6000V AC / 1 min
• Operating Temperature: -25C to +70C
• Cable Length: 1 meter
• Connector: 3.5mm Mono Audio Jack

Features

• Direct Voltage Output: The pre-installed internal burden resistor scales the current signal into a 0–1V range. This protects the sensor from high-voltage spikes that can occur in current-output models if they are accidentally disconnected under load.
• Tool-Free Installation: The clip-on (split-core) design allows the sensor to be snapped around a wire without disconnecting the electrical circuit, making it ideal for retrofitting into existing electrical panels.
• Galvanic Isolation: Provides a high level of safety by ensuring there is no direct electrical connection between the high-voltage AC line and your low-voltage monitoring circuit.
• Compact and Lightweight: At approximately 45g, it is easy to mount in tight spaces such as distribution boards or behind appliance panels.
• Industry Standard Compatibility: Its 1V output and 3.5mm jack are standard for many open-source energy monitoring platforms.

Pin & Wiring Configuration

• Output Signal: AC voltage (Sine wave).
• 3.5mm Jack: The Tip and Sleeve carry the AC signal.
• Wiring Note: Do not pass a multi-core cable (containing both Live and Neutral) through the sensor. It must be clipped around only one of the conductors.

Common Applications

• Home Energy Auditing: Monitoring the consumption of high-power appliances like air conditioners, electric ovens, or laundry dryers.
• Renewable Energy Systems: Measuring the output of string inverters in medium-sized solar PV installations.
• Industrial Maintenance: Detecting current irregularities in AC motors or pumps to identify mechanical failure or blockages.
• Smart Grid Research: Providing real-time load data for demand-side management projects.

Usage Tips

• ADC Biasing Required: Because the 1V output is an AC signal (swinging from -1V to +1V), you must use a DC bias circuit (two resistors and a capacitor) to offset the signal to the centre of your microcontroller's ADC range (e.g., 2.5V for an Arduino).
• Avoid External Resistors: Using an additional external burden resistor with this specific model will reduce the output voltage and lead to inaccurate readings.
• Scaling Factor: In your software, 1V AC represents exactly 50A of primary current.