8 CH 20A Relay Switch Module(With Current Detection)
Model No:RL.08.20B
The 8 CH 20A Relay Switch Module(Witch Current Detection) (see Figure 1) serves as a system switch execution unit, typically installed in a distribution box, rail-mounted, occupying 8P module units. It provides 8 channels of 20A relay switching, using magnetic latching relays. The module features a built-in mechanical forced cut-off switch, enabling relay operation even during system crashes or power outages. Each circuit can independently control the switching of 4400W lighting fixtures and includes load current detection per channel, with a detection accuracy of 10mA. The module triggers an alarm when a relay is closed but the load current remains at 0.
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Wiring Diagram
Product Features
Rail-mounted installation
8-channel 20A relay switching
Circuit initial state setting
Delay control
Configurable interlock mode
Status feedback
Local control
Remote control
Scene control
Simple wiring
Control various types of lights
Fire-resistant material
Fire alarmlinkage
External current transformer
Data detection
Mechanical strong cut off function
Online program update
YC-BUS protocol
RS485 protocol
Product Specifications
Operating Voltage
24VDC±10%
Maximum Power Consumption
≤4.8W
Rated Voltage
250/400VAC
Output Circuit
8-channel relay (external mutual inductance coil, accuracy 10mA)
Relay
Hongfa single contact magnetic latching relay
Rated Current
20A (single channel),Surge current capability: 500A/2ms (single channel)
Switching Cycles
no-load: 1,000,000times， load: 30,000times
Protection
circuit breaker for each circuit
Operating Temperature
-5˚C~45˚C
Operating Relative Humidity
≤90%
Storage Temperature
-20˚C~60˚C
Storage Relative Humidity
≤93%
Dimensions（L*W*H）
144mm*98 mm*68 mm
Net Weight
≤540 g/pcs
Enclosure Material
flame retardant PP
Installation Methodg Current of Relay
standard 35mm DIN rail mounting
Dimension
The module uses a compact 8P DIN rail mounting structure
Software Presentation
ET-R0820AT1280
configuration software1280720
controlinterface1280
classroom
hotel
HA
Product Structure Description
By integrating with an intelligent lighting gateway, local switch control and remote switch control can be achieved. It can also be connected to HOMEASSISTANT.
Application Scenarios
Shenzhen Huayi Design Office Smart Lighting Control System 
