2CSM222491R1000 ABB DWTL1 Digital Weekly Astronomical Twilight Time Switch with DWS Sensor

Why Choose the ABB DWTL1 Digital Time Switch?

The ABB DWTL1 is a digital weekly astronomical and twilight time switch designed for intelligent automatic control of lighting systems, illuminated signs and other loads that need to respond to both programmed schedules and ambient light. It combines weekly time programming, astronomical switching and an external luminosity sensor in one compact DIN-rail device.

The DWTL1 provides 1 channel with a changeover contact and supports up to 120 programmes. It can operate as an astronomical switch with probe input or as a programmable twilight switch, enabling loads to respond to sunrise, sunset, measured ambient brightness and programmed operating periods.

Operating from a 230 V AC, 50/60 Hz supply, the DWTL1 provides up to 16 A switching current and includes the ABB DWS external light sensor. Bluetooth connectivity enables configuration from a compatible smartphone or tablet, while a replaceable backup battery preserves settings and timekeeping during mains interruptions.

Key Advantages

• Combines weekly, astronomical and twilight control in one device.
• Includes the ABB DWS external luminosity sensor.
• 1-channel changeover output for flexible load control.
• Supports up to 120 programmes for detailed scheduling.
• Bluetooth connectivity enables convenient programming from compatible mobile devices.
• Replaceable backup battery helps retain settings and timekeeping during power failures.
• Automatic sunrise and sunset calculation supports seasonal lighting control.
• Compact 2-module DIN-rail format integrates neatly into distribution boards and control panels.

Key Features

• ABB DWTL1 digital weekly astronomical twilight time switch.
• Weekly time, astronomical and twilight functions.
• 1 switching channel.
• 1 changeover (NO/NC) contact.
• 230 V AC, 50/60 Hz supply.
• Maximum switching current of 16 A.
• Up to 120 programmable events.
• 1-minute programming resolution with 1-second pulse programming.
• Bluetooth interface for mobile-device programming.
• Automatic summer/winter time changeover.
• Holiday, impulse, cycle and random programme functions.
• Manual switching and switching preselection.
• External push-button input.
• Replaceable backup battery.
• ABB DWS external light sensor included.
• IP20 protection rating.

Intelligent Astronomical and Twilight Control

The ABB DWTL1 can be configured for astronomical operation with the DWS sensor, allowing loads to operate from sunset to sunrise while also responding to unusually low daytime light levels. Alternatively, programmable twilight operation allows switching when measured brightness falls below the configured threshold and the weekly programme permits operation.

Bluetooth connectivity simplifies commissioning by allowing schedules and settings to be prepared on a compatible smartphone or tablet and transferred to the time switch. Combined with its replaceable backup battery, external DWS sensor and multiple programme functions, the DWTL1 provides a versatile solution for lighting systems that require both calendar-based and daylight-responsive control.

Typical Applications

• Street, pathway and external-area lighting.
• Shop-window and retail display lighting.
• Illuminated signs and advertising displays.
• Commercial and public-building exterior lighting.
• Architectural, façade and monument illumination.
• Car-park and security lighting systems.
• Lighting systems requiring combined weekly and daylight-dependent control.