Multifunctional Astronomical Timer REV-303

(1 customer review)


Display: Graphical OLED display, Voltage: 24-240V AC 50/60 Hz & 12-24V DC, Output: 16A (3.5 kW) @ 240V AC SPDT (1NO+1NC), Events: 500 events spread over 2 selectable preset programs, Application: Astronomical Time Switch, Daily-Weekly Timer, Lighting System Smart Control, Street Light Automation, Indoor and Outdoor Lighting Automation, Machine/Equipment On/Off operation. Country of Origin: India

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Timer REV-303 is a microprocessor-based programmable device designed to control the loads in real time without permanent maintenance with minimum expenses and maximum electricity saving. Timer REV-303 can be used to switch on the heating system, pumps, fans, school signals, street illumination, highlighting of buildings fronts (around territories, car parking and other objects). Timer REV-303 can automatically define the time of sunrise and sunset on the basis of entered coordinates and current time which enables to control the illumination (street light) without using the external sensors.

Timer REV-303 features:

  • Two programs of control with quick switching over between them;
  • Four operational modes of timer (astronomic, weekly, daily and simple modes);
  • Calendar with operational life for 6 years period without external power supply;
  • Accuracy of planned events 1 second and 0.1 second in simple mode of timer;
  • Total internal memory for 500 independent events, divided between the programs;
  • Automatic shift for summer time and winter time;
  • Light-emitting graphic display (OLED);
  • Indication of current state of relays contacts;
  • Control of timer with 4 buttons, located on the front panel;
  • Possibility to set an access password for setup menu;
  • Power supply from the electric line 24 – 265 V 50/60 Hz or from DC source of 8-24 V battery;
  • 16A relay output 250V AC

Every day the timer calculates the real time of sunrise and sunset, sums this time with the time of event, and then the resulted time is referenced with the clock of real time and if the resulted time is more or equal to real time – the time will switch the load relay in state which is assigned by the event.

The above described algorithm is performed for each event planned by the user. In case when there are more than 1 event planned, only the event which corresponds to the real time clock will be activated, other events will not be performed. At the latitudes where there is a polar day, the events concerning the sunset will not be performed and the time of the sunrise is taken as equal to 00:00. At the latitudes where there is a polar night the events concerning the sunrise will not be performed, and the time of the sunset is taken as equal to 00:00.

Additional Information:

Additional information

Weight 0.200 kg
Dimensions 10 × 3.6 × 6.7 cm




Country of Origin


1 review for Multifunctional Astronomical Timer REV-303

  1. debasish

    Awesome very useful for lighting and real time based applications.

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