Evolution Aqua Dual Time Delay A230 (Time and duration) - 4 dials

The Evolution Aqua GRT8-S2 is a DIN-rail mounted asymmetric cycle timer relay designed for automatic cyclic switching of electrical equipment. It allows separate adjustment of ON and OFF times, making it suitable for applications where operating and resting periods need to differ.

Key Features

• Wide supply voltage range: AC/DC 12V–240V (50/60Hz)
• Asymmetric timing: Independently adjustable ON and OFF periods
• Time range: Adjustable from 0.1 seconds up to 100 days
• Two operating modes:
  • Cycle starting with pulse (ON first)
  • Cycle starting with pause (OFF first)
• LED status indicators for power and relay operation
• Compact DIN-rail mounting (1-module width)
• Suitable for AC and DC loads
• 16A relay output rating with dual changeover contacts (2 × SPDT on the S2 version)

Typical Applications

• Pond and aquarium equipment control
• Cyclic aeration systems
• Ventilation and extraction fans
• Dehumidification systems
• Lighting control
• Circulating pumps
• Heating systems
• Industrial process automation requiring repeating ON/OFF cycles

Technical Summary

Example Use

You could set:

• ON time: 30 seconds
• OFF time: 5 minutes

The relay would continuously energize the connected device for 30 seconds, then switch it off for 5 minutes, repeating the cycle indefinitely.

This type of timer is particularly useful where equipment must run intermittently to reduce energy consumption, prevent overheating, or maintain controlled environmental conditions.