24-Hour Mechanical Timer Switch AC 100–250V 20A Programmable

Take Full Control of Your Power Schedule

The TB388 Mechanical Timer Switch is a robust, waterproof 24-hour programmable switch designed to automate and optimize power usage across a wide range of residential and commercial applications. With a high load capacity, precise 15-minute interval settings, and broad voltage compatibility, this timer puts smart scheduling at your fingertips — no complex programming required.

Key Features

• Waterproof Design: Built to operate safely in diverse and demanding environments, including outdoor and damp locations.
• Precise 15-Minute Intervals: Set on/off cycles as short as 15 minutes for accurate scheduling and efficient energy use throughout the day.
• Wide Voltage Compatibility: Operates across AC 100–250V, making it suitable for use in various regions and with a broad range of electrical devices.
• High Load Capacity: Handles resistive loads up to 20A and incandescent lamp loads up to 10A — ideal for both residential and light industrial applications.
• Low Power Consumption: Draws only 1W at 110VAC and 2W at 220VAC, so the timer itself contributes minimal overhead to your energy bill.
• Wide Application Range: Perfect for water heaters, water dispensers, street lamps, staircase lighting, advertising light boxes, aquatic systems, irrigation controllers, and office power management.
• Batteries Included: Ready to use right out of the box.

Technical Specifications

What's in the Box

• 1 × TB388 Mechanical Timer Switch (batteries included)

Helpful Resources

For guidance on safe electrical installations and energy-saving strategies, visit the U.S. Department of Energy – Home Energy Automation Tips.

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Note: Monitor brightness and ambient lighting may cause slight color variation from product images. Please allow ±2–5mm measurement deviation for stated dimensions.

Learn more: Timer

Frequently Asked Questions

Q: What types of devices can I control with this 24-hour mechanical timer switch?

A: The TB388 mechanical timer switch is highly versatile. It can be used to automate water heaters, water dispensers, street lamps, staircase lights, advertising light boxes, aquatic/breeding systems, irrigation controllers, and general office power management — anywhere you need scheduled on/off control of an electrical load up to 20A.

Q: Is this timer switch safe for outdoor use?

A: Yes. The TB388 features a waterproof construction that allows for safe operation in outdoor and damp environments, such as garden irrigation systems, outdoor lighting, and street lamp control panels.

Q: How fine can I set the on/off schedule?

A: The minimum programmable interval is 15 minutes. You can set multiple on/off cycles within a 24-hour period, giving you precise and flexible scheduling to match your exact power management needs.

Q: Does this timer work with both 110V and 220V electrical systems?

A: Yes. The TB388 is compatible with AC 100–250V, making it suitable for both North American (110V) and international (220–240V) electrical systems without any modifications.