Description

Technical

Wiring

Description

Multi channel power meter provides a compact and robust measurement solution; It can achieve reliable monitoring of commercial building electrical or industrial loads at a lower single point installation cost through sub metering. Single phase circuits can support up to 18 channels, while three-phase circuits can support up to 6 channels.

This device can perform real-time metering, measure energy consumption and power generation, support multi rate time of use (TOU) billing, and monitor power quality. It offers multiple advanced communication options, including Modbus via RS485, Ethernet interface, and various input/output communication combination options, enabling extensive and reliable data exchange.

Working conditions

-Power supply

AC/DC: 90–240 V, 50/60 Hz;

Maximum power consumption <5 W

- Work environment:
Temperature: -20 ° C~+60 ° C
Humidity: 20%~95% RH (without condensation)

- Storage environment
Temperature: -25 ° C to+70 ° C
Humidity: 20% to 95% RH (non condensing)

Input

Current	Range: 0–5 A (Optional: 1 A, 5 A, 100 mA)
voltage	Range: 0–480 V L-L (CATIII-300 V)
frequency	50/60Hz
current overload	Can operate continuously at 1.2 times the rated value; can operate for 5 seconds at 10 times the rated value.
Voltage overload	Operate at twice the rated value for 30 seconds

Accuracy

Parameter

Accuracy

Total

voltage

Current

active power

reactive power

apparent output

power factor

Active power energy

Reactive power

frequency

0.2

0.5s

1.0

0.1

var1

VA1

PF1

var2

VA2

PF2

var3

VA3

PF3

var

varh

Technical

Function		Parameter
Real-time parameters	voltage	Ua, Ub, Uc / Uab, Ubc, Uca	●
	Current	Each channel/phase	●
	power	Each channel/phase	●
	reactive power	Each channel/phase	●
	apparent output	Each channel/phase	●
	power factor	Each channel/phase	●
	frequency	Each channel/phase	●
electric energy	Active power +	Each channel	●
	Reactive power +	Each channel	●
	Active power-	Each channel	●
	Reactive power-	Each channel	●
	Time-of-Use Electricity Pricing	4 pricing plans, 12 sub-sessions	○
Power Quality	total harmonic distortion	UTHD, UTOHD, UTEHD, UTHFF, UCF ITHD, ITOHD, ITEHD, IKF	○
	Single harmonic	2nd-31st	○
	Voltage imbalance	/	○
	Current imbalance	/	○
	Demand recording	Demand record for the past three months	○
	voltage deviation	/	○
report to the police	Virtual Alarm	5 alarm triggers	○
I/Omodule	1-channel pulse output	Default value: 5000 pulses/kWh VCC<48V，Iz<50mA	○
I/Omodule	6-channel discrete input	Open-circuit resistance <500 Ω; closed-circuit resistance> 100 kΩ	●
communication	RS485 interface	RS485，Modbus-RTU	●

Note: "●" indicates standard functionality; "○" indicates optional functionality;

Wiring

Terminal	Explaination
L/ N	Auxiliary Input: 85–265 Vac/DC
Ua/ Ub/ Uc/ Un	A, B, C phase and neutral line voltage input
Metering 1-6	6-channel current input
C	Public terminal
D1-D6	6 Relay Input Ports
A B	RS485 communication interface

SEM8MT

Note: When using the 3P3W wiring configuration, Ub and Un must be externally short-circuited as shown in the diagram; otherwise, the displayed voltage will be incorrect.