Description

3WIRE SP12CH

SP12CH Single Phase 12 Channels Smart Meter

The 3WIRE SP12CH is a single-phase 12-channel smart energy meter designed to measure 12 different loads from one compact DIN rail meter. It is a practical 12-in-1 metering solution for tenant metering, branch-circuit monitoring, lighting circuits, small power circuits, distribution boards and multi-load energy monitoring applications.

The SP12CH is supplied with 100A split-core clip-on CTs, supports Modbus RTU through RS485, provides infrared reading, active pulse output, event alarms, data freeze records and per-channel electrical measurements including voltage, current, frequency, power factor, active power, reactive power, apparent power and active energy.

Meter Type Single-phase 12-channel smart energy meter

CT Supplied 100A split-core clip-on CTs, 1 CT per channel

Communication RS485 Modbus RTU and infrared port

Installation Standard 35 mm DIN rail mounting

Product Description

The SP12CH is designed to reduce the cost and space required for multi-circuit energy monitoring. Instead of installing 12 separate single-phase meters, one SP12CH can monitor 12 individual loads using independent metering channels and split-core CTs.

Each channel has its own high-precision energy metering chip to improve measurement reliability. The meter supports 4-quadrant energy measurement, allowing each channel to measure both import and export energy with net energy calculation.

Best use case: SP12CH is suitable for retrofit branch-circuit metering where many single-phase loads must be monitored through one compact RS485 Modbus meter.

Product Image

SP12CH Single Phase 12 Channels Smart Meter

Key Features

12-in-1 Energy Meter

Measures 12 different single-phase loads from one compact smart meter.

Independent Metering Chips

Each channel has an independent high-precision energy metering chip for reliable per-channel measurement.

100A Split-Core CTs

Supplied with 100A split-core clip-on CTs, one CT for each of the 12 channels.

4-Quadrant Energy

Measures import energy, export energy and net energy calculation for each channel.

Per-Channel Electrical Values

Measures voltage, current, frequency, power factor, kW, kVAr, kVA and active energy by channel.

RS485 Modbus RTU

Provides one RS485 communication channel for Modbus RTU integration with gateways, SCADA, EMS or IoTWatt 4.0.

Infrared Communication

Data can also be read through the IR port using a handheld unit.

Alarm and Event Monitoring

Records and alarms events such as undervoltage, overvoltage, voltage spike, phase failure and AC input power failure.

Data Freeze Records

Supports timed, hourly and daily data freeze records for energy and related values.

Typical SP12CH System Architecture

SP12CH meters can be installed in distribution boards to monitor up to 12 single-phase circuits. Data is collected through RS485 Modbus RTU and can be connected to a gateway, BMS, EMS, SCADA or IoTWatt 4.0 platform for central dashboards, tenant metering, energy reports and load analysis.

1 12 Single-Phase Loads

2 100A Split-Core CTs

3 SP12CH Meter

4 RS485 Modbus RTU

5 IoTWatt 4.0 / EMS

Measurement Functions

The SP12CH provides telemetry measurements for all 12 channels, enabling per-circuit visibility of electrical and energy values.

Function	Measured Channels	Description
Voltage	L1 to L12	Voltage measurement for each monitored load channel.
Current	L1 to L12	Current measurement for each CT channel.
Active Power	L1 to L12	Active power measurement for each load.
Power Factor	L1 to L12	Power factor measurement for each channel.
Frequency	L1 to L12	Frequency value available across the monitored channels.
Active Energy	L1 to L12	Active energy measurement for each channel, suitable for branch-circuit energy accounting.

Communication, I/O and Alarm Functions

Function Group	Capability	Details
Remote Control	Clock synchronisation	The smart meter can be remotely calibrated / synchronised through the RS485 communication interface.
Voltage Alarm	Low voltage, high voltage, voltage spike, phase failure and AC input power failure alarm	Used to identify abnormal voltage or supply-related events.
Lightning Arrester Alarm	Lightning arrester failure and lightning protection air circuit breaker disconnection alarm	Useful for panels where surge protection status is monitored.
Dry Contact Inputs	6 dry contact inputs	Input 1: mains switch status; input 2: oil engine switch status; input 3: lightning arrester failure; input 4: arrester air circuit breaker status; inputs 5 and 6 reserved.
Relay Output	1 relay output	Supports automatic or manual operation. For mains power failure, relay closes; for mains power normal, relay disconnects.
RS485	1 communication channel	RS485 interface for Modbus RTU data collection.
Active Pulse Output	Active pulse output for 1 to 12 loops	Pulse output can be used for external pulse monitoring or energy pulse interface.
Infrared Communication	IR port	38 kHz modulation, baud rate 1200 bps for handheld meter reading.

Data Freeze and Billing Support

The SP12CH supports reading closing date setup, enabling automatic monthly bill settlement for each month. It also supports freeze functions for periodic records.

Freeze Function	Capacity	Typical Use
Timed Data Freeze	30 timed freeze records	Used for scheduled recording of energy and related values.
Hourly Data Freeze	254 hourly freeze records	Used for hourly energy review and load profile reference.
Daily Data Freeze	62 daily freeze records	Used for daily consumption review and monthly settlement support.
Reading Closing Date	Configurable	Used to support monthly automatic bill settlement by channel.

Technical Specification

Item	Specification
Product Name	SP12CH Single Phase 12 Channels Smart Meter.
Metering Channels	12 single-phase load channels.
Current Rating	3 × 10(100)A, supplied with 100A split-core clip-on CTs.
Working Voltage	DC 40V to 273V, AC 40V to 264V.
Specified Operating Voltage	0.3Un to 1.1Un.
Extended Operating Voltage	0.15Un to 1.15Un.
Working Voltage Limit	0.0Un to 1.15Un.
Frequency	50Hz.
Accuracy Class	Active: 0.5S / 1. Reactive: 1 / 2.
Standards	IEC 62053-21 for active energy and IEC 62053-23 for reactive energy.
Clock Accuracy	≤ 0.5s/day at 23°C; variation with temperature change < 0.1s/day.
Voltage Circuit Power Consumption	≤ 1.5W, 6VA per phase under nominal condition.
Current Circuit Power Consumption	≤ 0.2VA for basic current < 10A; ≤ 0.4VA for basic current ≥ 10A.
Communication	RS485 Modbus RTU and infrared communication.
Pulse Constant	400 imp/kWh and 400 imp/kvarh.
I/O	6 dry contact inputs, 1 relay output and active pulse output for 1 12 loops.
Display	LCD digital display with loop display of parameters for each channel.
Installation	Standard 35 mm DIN rail installation.
Dimensions	158 mm × 87 mm × 58 mm.
Weight	350g.
Reference Test Condition	23°C ± 2°C and RH 40% to 60%.

Connection Diagram and Dimensions

The SP12CH supports connection of 12 single-phase CT channels, AC voltage input, DC / AC power input, digital output, digital inputs, RS485 and pulse output port. The compact body is suitable for DIN rail installation inside distribution boards and metering panels.

SP12CH Connection Diagram and Dimension

Typical Applications

Tenant Sub-Metering

Monitor up to 12 tenant or unit circuits from one meter for energy allocation and billing support.

Distribution Board Monitoring

Measure multiple outgoing single-phase feeders in DBs, floor panels and retail panels.

Lighting and Small Power Circuits

Track lighting, socket, small power and auxiliary loads separately by circuit.

Retrofit Energy Monitoring

Split-core CTs make it easier to add monitoring to existing panels with reduced shutdown and rewiring work.

Multi-Load Energy Audit

Collect circuit-level consumption data to identify major users, wastage and abnormal load behaviour.

IoTWatt 4.0 Integration

Use 12-channel data for dashboards, load comparison, tenant metering and digital energy audit workflows.

Integration with IoTWatt 4.0

When connected to IoTWatt 4.0, SP12CH provides high-density single-phase circuit data for dashboards, cost allocation, tenant metering, branch-circuit analytics, energy audit evidence, abnormal consumption detection and EECA reporting support.

Monitor up to 12 single-phase circuits from one compact meter.
Compare kWh, kW, current, power factor and energy use between loads.
Use import, export and net energy values for each channel.
Use freeze records for periodic energy review and settlement support.
Use alarms to detect undervoltage, overvoltage, voltage spike, phase failure and AC input power failure.
Connect through RS485 Modbus RTU using a gateway such as RS2LAN, RS2MQTT or RS2WLAN.

Integration note: SP12CH is a practical high-density metering device for IoTWatt 4.0 projects where many single-phase circuits need to be monitored at low cost from one distribution board.

Recommended Deployment Checklist

Confirm the number of single-phase loads to be monitored, up to 12 channels.
Confirm that 100A split-core CTs are suitable for each circuit.
Confirm conductor size and CT installation space inside the panel.
Confirm AC voltage input, working voltage and power supply connection.
Confirm RS485 Modbus address, baud rate, parity, cable type, shielding and termination.
Confirm if IR handheld reading is required.
Confirm use of dry contact inputs for mains switch status, generator switch status or surge protection alarm status.
Confirm relay output and active pulse output requirements.
Confirm freeze data and monthly closing date configuration.
Confirm integration with BMS, EMS, SCADA, gateway or IoTWatt 4.0.
Test channel mapping, CT direction, displayed values, Modbus register reading, alarms and pulse output during commissioning.

SP12CH Supply, Commissioning and IoTWatt 4.0 Integration

Saturn Pyro supports 3WIRE SP12CH Single Phase 12 Channels Smart Meters for tenant metering, branch-circuit monitoring, distribution board metering, 100A split-core CT installation, RS485 Modbus integration, EMS / BMS / SCADA connectivity and IoTWatt 4.0 digital energy audit projects in Malaysia.

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