Intermatic T7801B Timer

The Intermatic T7801B is a professional-grade 7-day mechanical time switch designed for complex scheduling in commercial and industrial HVACR environments. As the official direct replacement for AE-174, this unit features a robust 120V clock motor and a 40 Amp resistive rating per pole, making it ideal for heavy-duty applications like lighting control, motor loads, and heating systems. Its 2 NO / 2 NC (DPDT) contact configuration allows for the simultaneous management of up to four separate circuits or the creation of sophisticated bypass and interlocking logic. The Intermatic T7000B series is preferred by contractors for its "set it and forget it" reliability, offering minimum 3.5-hour intervals and independent schedules for each day of the week. Housed in a durable NEMA 1 indoor metal enclosure, the T7801B ensures permanent schedule retention through mechanical trippers, eliminating the risk of digital memory loss during minor power fluctuations in demanding job sites.

Key Benefits

• Versatile Load Handling: Rated for 40A resistive and up to 10 HP at 240V, providing reliable switching for inductive, tungsten, and pilot duty loads.
• True 7-Day Scheduling: Allows for distinct ON/OFF cycles every day of the week, perfect for facilities with varying weekend or holiday operating hours.
• DPDT Contact Form: Features 2 Normally Open and 2 Normally Closed poles, offering maximum flexibility for multi-circuit or changeover applications.
• Simplified Replacement: Serves as the high-compatibility direct replacement for AE-174, fitting into existing footprints for faster service calls.
• Separate Clock Motor Terminals: Enables the clock motor to be powered independently, allowing the switching of auxiliary or low-voltage circuits.

Common Questions

Can I set multiple ON/OFF cycles per day?
Yes. The Intermatic T7801B comes with 7 ON/OFF tripper pairs, allowing at least one unique cycle per day. Additional trippers can be added for more frequent switching, provided you maintain the minimum 3.5-hour interval between operations.

Does this timer save settings during a power outage?
As a mechanical timer switch, the program remains physically set via the trippers on the dial. While the clock motor will stop during an outage (delaying the time of day), the schedule itself cannot be "wiped" like a digital unit. For critical timing, the T7801B includes a 16-hour carry-over system to keep the dial moving when power is lost.

Is the T7801B compatible with 240V loads?
Yes. While the clock motor requires a 120V AC supply, the heavy-duty 40 amp switch contacts are rated to handle up to 480V VAC for resistive loads and up to 10 HP for three-phase motor applications.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.