GWL Power BMS123 User Manual

User manual

BMS123 Smart Relay

Introduction

123 Smart Relay is a dual relay module with extremely low self-power consumption. It can be used to
switch high currents or even small signals. The design ensures long operation, even on very small
batteries. It is a perfect companion with the BMS123 Smart if you need to switch inverters and/or
chargers.

Smart

An integrated microcontroller ensures reliable operation in harsh environments, combined with very low
power consumption. Two LEDs display the current state of each relay. One flash means the relay is off,
two flashes indicate the relay is on. It’s as simple as that.

Mounting

The module contains two long bolts and nuts to keep the module’s relays in place. It is possible to mount
the module by removing the nuts, drilling the respective two holes in the plate where the modules needs
to be mounted and adding the nuts again behind the plate. Another option is to remove one bolt and
then insert the desired mounting bolt/screw. When done, remove the other bolt and replace this with
the other desired mounting bolt/screw.

Note: always make sure there is one bolt in the relay when changing the other. Otherwise the module
will lose its strength.

Description

Value / range

Operating supply voltage range

9.0V to 70.0V

Operating temperature range

-40 to 70°C

Maximum current consumption average

@12V

<0.3mA

@24V

<0.4mA

@48V

<0.5mA

Minimum signal input voltage to turn on

5V

Maximum switching current

@12V

120A @24V

120A @48V

60A @230VAC

120A

Maximum switching time

0.3s