Product Details

1 Product Overview

SC-LP-3CTLoRa is a passive wireless current sensor integrating high-precision current measurement and temperature monitoring. It transmits data to a receiving device via wireless communication, enabling real-time remote monitoring of the measured circuit’s data and early detection of potential safety hazards to ensure electrical safety.

The sensor adopts a dual power supply mode: it can operate by connecting to a CT current signal or via an internal battery, switching adaptively and flexibly. No external power supply is required, reducing maintenance. Its compact shape makes installation convenient and adaptable to various application scenarios.

3 Technical Parameters

Function	Technical parameter
Current measurement	Measuring circuits: three; measurement range: secondary input signal 100mA (1.2× overload continuous); measurement accuracy: ≤1% FS; current ratio: settable 1~9999 (set at factory per note)
Temperature measurement	One built-in ambient temperature channel; measurement range: -20~85℃; measurement accuracy: ±2℃; resolution: 0.1℃
Wireless transmission	Antenna: external (default angled rod antenna, optional suction-cup antenna); frequency band: 433MHz; transmission distance: 150m (open area); sending period: CT current 20s, battery 5min
Power supply	CT current, built-in lithium battery (life 3~5 years)
Operating environment	Temperature: -20~85℃; humidity: 5%~95% RH non-condensing
Protection rating	IP42
Insulation	Insulation resistance: terminal to housing >500MΩ
Installation	Strong magnetic attachment, screw fixing

4 Wiring Terminals

Note: the terminals marked ”*” are the CT secondary current inputs, with input 100mA.

5 Structure & Outline Dimensions

5.1 Current Sensor

Item	Detail
Sensor structure	See diagram
Installation	Bottom strong magnetic attachment or screw fixing

Item	Detail
Sensor main unit outline dimensions, tolerance ±0.5mm	See diagram

5.2 Current Transformer (optional)

Performance parameter	CTK-16	CTK-22	CTK-36
Style	Open/close type	Open/close type	Open/close type
Rated input current	100A / 100mA	200A / 100mA	600A / 100mA
Accuracy	0.5%	0.5%	0.5%
In-hole accuracy variation	≤0.2% (accuracy difference of a 10mm-diameter input current wire at different positions in the through-hole)	≤0.2%	≤0.2%
Aperture	Φ16±1mm, suitable for cables 5mm-14mm in diameter	Φ22±1mm, suitable for cables 5mm-20mm in diameter	Φ36±1mm, suitable for cables 15mm-35mm in diameter
Transformer cable length	0.5m	0.5m	0.5m

6 Wireless Receiving Devices

It is compatible with multiple series of wireless receiving devices supporting various communication protocols, adapting to various on-site application needs and flexibly integrating into various systems to acquire data.

Item	Model 1	Model 2	Model 3	Model 4
Outline dimensions	885937mm	906525mm	15013060mm	18812238mm
Display	None	None	4.3-inch color screen	7-inch touch screen
Number of sensors connected	64	64	128	128
Power supply	AC/DC220V; DC9-36V	DC9-36V	AC/DC220V	DC9-36V
RS485 interface	1 channel	2 channels	2 channels	2 channels
RJ45	/	Yes	Yes	Yes
4G	/	Yes	Yes	Yes
Communication protocol	Modbus-RTU	Modbus-RTU	Modbus-RTU	Modbus-RTU

Note: for detailed information on the wireless receiving devices, refer to the manual of the corresponding model.

7 Common Troubleshooting

Fault symptom	Analysis	Solution
Indicator light does not flash	Insufficient battery power	Check whether the built-in battery has power; if not, replace it. When powered by battery only, it takes about 5 minutes for the indicator to flash.
Inaccurate current measurement	Signal input terminal not tightened	Re-tighten the wiring terminal
	Transformer failure	Check whether the input signal is consistent with the actual value and whether the transformer cable is open-circuited or damaged; replace the transformer if necessary
	Sensor failure	Replace the sensor
No data from the receiving device	Incorrect setting	Check whether the sensor ID and other information set on the receiving device are correct
	Antenna not properly installed	Check whether the antenna is correctly installed and intact
	Distance too far	Verify whether the distance between the sensor and the receiving device is within the nominal range