Gic L&T 67DDT0 Digital Time Switch Crono , Daily Weekly Programmable Electronic Timer Switch

Specifications

• Supply Voltage: 110V - 240V AC (50/60 Hz).

• Contact Rating: 16A @ 250V AC (Resistive), 5A (Inductive).

• Output Type: 1 C/O (Changeover) SPDT Relay.

• Programs: 25 ON / 25 OFF steps per day or week.

• Min Switching Time: 1 Second.

• Battery Reserve: 6 Years (Internal Li-ion).

• Modes: Auto / Manual Override / Holiday Mode.

• Display: LCD with 12/24 Hour format.

• Mounting: DIN Rail (35mm) or Wall Mount.

Compatibility & Platform Support

• Direct Load (Resistive): Can directly switch heaters or lights up to ~2000W.

• Inductive Load (Motors/Pumps): ⚠️ Caution. For motors > 0.5HP, you MUST use a Contactor. The internal relay is rated for 16A resistive but only 5A inductive. The high starting current of the pumps will weld the timer contacts if connected directly.

Key Applications & Projects

• Street Light Automation: Set lights to turn ON at 6:30 PM and OFF at 6:00 AM automatically.

• Water Pump Controller: Schedule the overhead tank pump to run for exactly 30 minutes every morning.

• Digital School Bell: Program up to 25 distinct ring times for class periods.

• Advertising Signage: Ensure costly neon billboards only run during peak evening hours.

Project Evolution

• Prerequisites: Basic understanding of AC mains wiring (Live/Neutral).

• The Upgrade: Pair this timer with a Magnetic Contactor.

• The Logic: The Timer acts as the "Manager" (Low Power), signalling the Contactor "Worker" (High Power) to switch massive loads like 3-Phase motors or entire building lighting circuits.

Virtual Technician: Wiring & Safety 

• Terminals 1 & 2 (Supply): Connect 220V AC Live and Neutral here to power the timer.

• Terminals 15 (Common) & 18 (NO): This is the switch. Connect your Live wire entering 15 and leaving 18 to your load (Light/Contactor coil).

• Terminal 16 (NC): Normally Closed contact (rarely used for standard ON/OFF).

• Safety Warning: Always turn off the MCB before wiring. This device handles high-voltage mains.

Accessories

• Included in the Box:

  • 1 x GIC 67DDT0 Crono Time Switch

  • 1 x User Manual

Frequently Asked Questions (FAQ)

• Does the time reset if electricity goes off? No. The internal battery keeps the time running for 6 years. The screen might turn off (to save power), but the clock keeps ticking.
• Can I use this for a 1.5HP motor directly? No. You must use a Contactor. Connecting a 1.5HP motor directly will burn the timer relay.
• How many programs can I set? You can set 25 ON and 25 OFF events.
• Can I set different times for weekends? Yes, it has weekly programming capability (e.g., Mon-Fri different, Sat-Sun different).
• What is the minimum time setting? 1 Second.
• Is this the "Mini" version or standard? This is the standard Crono series (Base/DIN mount).
• Can I mount it on the wall without a rail? Yes, it has screw slots for surface mounting, but DIN rail is neater.
• How do I reset the device? Press the "R" (Reset) button with a small pin/pen for 3 seconds.
• What does "1 C/O" mean? 1 Changeover Contact. It has a Common, Normally Open (NO), and Normally Closed (NC) point.
• Is the battery replaceable? Not user-replaceable easily (soldered inside). But 6 years is a long service life.
• Can I use it for DC loads? Yes, the relay is "Potential Free". You can switch 12V or 24V DC through contacts 15-18, provided the Timer Supply (1-2) is AC.
• Does it have a backlight? No, the standard 67DDT0 LCD is non-backlit.
• How do I manually turn on the load? There is a "Manual" button to toggle ON/OFF/AUTO.
• Is it waterproof? No (IP20). It must be installed inside a panel or weatherproof box.
• Can I use it for school bells? Yes, specifically because it supports "Pulse" mode (Bell mode) in some firmware versions, or simply set 1-minute durations.
• Why is the screen blank out of the box? The battery is in sleep mode. Connect AC power to wake it up.
• What is the difference between 67DDT0 and 67DDT9? DDT9 is often the "Astro" version (Solar based). DDT0 is the standard Time based. Check the label carefully.
• Can I lock the keypad? Yes, to prevent tampering by unauthorized staff.
• Does it support Daylight Saving Time (DST)? Yes, configurable in settings.
• Is it made in India? Yes, GIC/L&T products are manufactured in India.