ID: 
2024
Maker's Name: 
Zellweger (Aust) Pty Ltd
Where made: 
Australia
Dimensions: 
18.5 × 11.7 × 7.5 cm

This unit is used to control turn-on times for domestic hot water systems. It contains a frequency-sensitive relay. A 1050 Hz signal is sent down the AC mains to this unit to toggle the relay on and off.