Greenbrook 7 Day Electronic Wall Timer Switch – T40S

The Greenbrook T40S 7 Day Electronic Wall Switch Timer is a programmable digital timer designed to replace an existing 1-way or 2-way light switch, providing automatic control of lighting while retaining the convenience of manual switching.

Offering flexible daily, weekly, weekday and weekend programming, the T40S provides up to 6 ON/OFF programmes per day with a minimum switching time of just 1 minute. A manual override allows the timer to operate as a conventional wall switch whenever required.

The timer features a digital display and 100-hour battery backup, helping retain programmed settings in the event of an interruption to the power supply. Importantly, no neutral connection is required, making it particularly useful when replacing existing wall switches where a neutral may not be available.

Designed for flush-mounted indoor installation, the T40S has a compact white polycarbonate housing measuring 86 × 88 × 38.5mm.

Key Features

• 7 day electronic wall switch timer
• Replaces an existing 1-way or 2-way light switch
• No neutral required
• Daily programming
• Weekly programming
• Weekday programming
• Weekend programming
• Up to 6 ON/OFF programmes per day
• 1-minute minimum switching time
• Digital display
• Manual override facility
• Can operate as a conventional manual switch
• 100-hour battery backup
• Flush-mounted installation
• Suitable for indoor use
• IP20 rated
• Class II
• Easy to set
• UKCA compliant
• 1-year Greenbrook guarantee

Technical Specification