Light Stream Relay 3 LITE - Technical datasheet
Features
Three heavy-duty 20 A outputs
Each output switches up to 20 A (4.5 kW), with inrush current up to 80 A. Outlets, motors, heaters, and water heaters connect directly, without contactors.
Independent channels
The outputs have no common groups or shared wiring: each one can be fed from its own line with its own circuit breaker rated up to 16 A.
Works with standard switches
Switches and push-buttons connect to the four inputs. The load can be switched on from the switch even if the controller is unavailable.
Scenario buttons
The module distinguishes short press, long press, double press, and "short then long" press. Each can be assigned its own action.
"Turn everything off"
A single switch can de-energize all outputs at once — for example, one placed at the entrance door.
Curtain drive control
Two outputs are combined to control a curtain drive. The module prevents "Open" and "Close" from being switched on at the same time and automatically enforces a pause when the direction changes.
Timers
For each output: on or off delay, timed on or off, cyclic switching.
Safe mode
If communication with the system is lost, the outputs automatically switch to a preset state, and control can be handed over to the switches. When communication is restored, the module resumes normal operation.
Grid and load protection
After power-up, the outputs turn on one after another so as not to overload the line with inrush currents. A reconnect delay protects compressors and pumps from frequent starts.
Pulse and frequency counting
The inputs count pulses and measure frequency up to 5 kHz.
Dimensions
53 × 90 × 58 mm
Technical specifications
Ergonomics
| Parameter | Value |
|---|---|
| Mounting | 35 mm DIN rail |
| Overall dimensions (W × L × H) | 53 mm • 90 mm • 58 mm |
| Weight (with box) | 175 g |
| Indication | S — Modbus communication; separate output status indicators |
Outputs
| Parameter | Value |
|---|---|
| Number of outputs | 3, mechanical relays, normally open (C and NO), independent |
| Switching voltage | up to 250 V AC, up to 30 V DC |
| Rated current per output (230 V AC) | 20 A |
| Maximum current per output (230 V AC) | 26 A |
| Inrush current (20 ms, 230 V AC) | up to 80 A |
| Contact resistance | less than 100 mΩ |
| Coil-to-contact insulation | 4500 V AC (1 min) |
| Insulation between open contacts | 2500 V AC (1 min) |
| Contact life | 30,000 switching cycles at 20 A / 230 V AC |
| Power-up turn-on delay | 0–999 s, per output |
| Reconnect delay | 0–999 s, per output |
Inputs
| Parameter | Value |
|---|---|
| Number of inputs | 4 (0–3), dry contact, common iGND terminal |
| Input voltage / current | ~12 V DC / ~2 mA when closed |
| Permissible voltage | −20 to +40 V |
| Pulse frequency | up to 10 Hz by default, up to 5 kHz without debounce suppression |
| Press types | short, long, double, "short then long" |
Interfaces
| Parameter | Value |
|---|---|
| Control interface | RS-485, no galvanic isolation |
| Power and RS-485 terminals | V+, GND, A, B; 3.5 mm pitch |
| Wire cross-section with ferrule, inputs | 0.35–1 mm² (two wires in one ferrule — 0.35–0.5 mm²) |
| Wire cross-section with ferrule, power terminals | up to 4 mm², solid-core wire — up to 6 mm² (two wires in one ferrule — up to 2.5 mm²) |
| Ferrule sleeve length | 8 mm (inputs), 10 mm (power terminals) |
| Tightening torque | 0.2 N·m (inputs), 0.5 N·m (power terminals) |
Modbus
| Parameter | Value |
|---|---|
| Protocol | Modbus RTU |
| Address | 1–247, factory address on the label on the side of the enclosure |
| Baud rate | 1200–115,200 bps, default 9600 |
| Default format | 8N2 |
| Firmware update | over RS-485, settings are preserved |
Power supply
| Parameter | Value |
|---|---|
| Supply voltage | 12–28 V DC |
| Power consumption | 0.5 W (relays off), 2 W (all relays on) |
| Peak consumption | up to 5 W for 20 ms |
| Ready after power-up | ~2 s |
Operating conditions
| Parameter | Value |
|---|---|
| Temperature | −40 to +80 °C |
| Humidity | up to 95%, non-condensing |
| Climatic design category (GOST 15150-69) | O2.1* |
| Service life | 5 years |
Wiring
| Terminals | Purpose |
|---|---|
| V+, GND | power supply 12–28 V DC |
| A, B | RS-485 bus |
| COM1, COM2 | common wires for two groups of three outputs |
| K1–K3 (C, NO) | relay outputs, each with its own terminals |
| 0–3 | dry-contact inputs |
| iGND | common input terminal |
The curtain drive connects to two outputs: they are supplied with phase L, and the "Open" and "Close" wires connect to them.
Caution
- The module is not suitable for three-phase loads: its outputs are not mechanically interlocked with each other (GOST 30011.4.1, clause 7.2.1.1.5).
- The relays are certified for AC only. Their load capacity may be lower on DC.
- When the relays switch on, the module briefly draws up to 5 W — choose a power supply with margin and account for voltage drop on long cables.
- Before connecting a curtain drive, enable "Drive control" mode, otherwise both directions may switch on at the same time.
Package contents
- Light Stream Relay 3 LITE
Maintenance
Connecting cables and wires must be in good condition and securely fastened. If the device works properly and no new features are needed, installing updates is not required. Before updating, it is recommended to back up the settings so that you can return to the previous version.
Safety
- Do not expose the device to rain or moisture — this will void the warranty.
- Do not remove the cover: there are no user-serviceable parts inside.
- Never connect the device to a dimmer.
- Never connect 0 V to electrical ground.
Warranty
3-year limited manufacturer's warranty (2 years for products sold before 30.09.2024).
Warranty service is not provided:
- for mechanical and other damage to the product caused by the buyer;
- for lamps, fuses, galvanic isolation and protection components;
- if the product was repaired by the buyer or by third parties;
- if the design of the product was modified;
- for equipment operated in violation of the power quality and capacity requirements of GOST 13109-97, under emergency conditions, or exposed to lightning strikes, fire or other extreme conditions;
- for product accessories (including cables, external power supplies, packaging) and parts not included in the delivery;
- if the wiring diagram or the rules of storage, transportation and operation were violated;
- if the product was exposed to chemicals or abrasive cleaning agents;
- if the product was used for purposes other than those stated in the datasheet;
- for damage caused by natural disasters or fire;
- if the manufacturer's (supplier's) label is missing.