The AST/C Digital Astronomical Time Switch, developed by Borna Electronics, is an advanced microprocessor-based solution designed to replace conventional photocells. By accurately calculating local sunrise and sunset times based on geographical location, the device can automatically switch loads ON and OFF within a programmable range of ±180 minutes relative to sunrise and sunset. In addition, switching operations can be performed at predefined times according to user requirements.

Unlike traditional photocells, the AST/C can be installed inside electrical panels and covered environments, eliminating operational errors caused by cloudy weather, dust, or environmental conditions. The product is available in single-relay and dual-relay versions, providing flexible control options for a wide range of lighting and automation applications. Type-Test Certified by Niroo Research Institute (NRI)

Features

• Microprocessor-based system for accurate sunrise and sunset calculations according to geographical location
• Predefined geographical codes for 40 cities across Iran
• Replaceable lithium backup battery with a service life exceeding 5 years
• Retains date, time, and all programmed settings during power outages
• Optional daylight-saving time (DST) adjustment for the first and second halves of the year
• Adjustable ON/OFF switching relative to sunrise and sunset within a range of ±180 minutes
• Selectable switch-off modes: Sunrise Mode, Time Mode (1–12 hours after sunset), and Clock Mode

Technical Specifications

Output Relay Options

Model Output Rating
AST1/C: Single Relay, 6 A
AST1/C: Single Relay, 20 A
AST2/C: Dual Relay, 10 A per Relay