Intermatic T104M 24-Hour Mechanical Timer Mechanism 208-277V DPST — Dual-Pole, 12-Cycle

The Intermatic T104M is a 24-hour mechanical dial timer mechanism (DPST) designed to control high-voltage loads on a reliable daily schedule.

This compact replacement mechanism fits Intermatic timer housings and works with models referenced by timer numbers G0428382, G2848361, and G2997181; note that the motor is sold separately. Built for commercial, industrial, and residential use, the T104M provides dependable on/off scheduling across a full day, supports dual-pole switching, and is rated for common line voltages between 208 and 277 volts. Its proven mechanical design offers repeatable cycling, a manual override for instant control, and included trippers for immediate setup.

How does the T104M manage daily schedules?

The T104M uses a 24-hour dial with adjustable tripper pins that let you program up to twelve ON and OFF operations each day. Its mechanical timing disk advances steadily to switch contacts at the set positions, giving precise recurring events without digital programming.

• 24-hour dial with one-hour minimum ON/OFF segments for predictable cycles
• Comes with one ON and one OFF tripper; up to 12 operations per day
• Mechanical action requires no software or memory backup
• Ideal for lighting, ventilation, heaters, and other time-based loads

What electrical ratings and contact configuration should I expect?

The mechanism is a double-pole single-throw (DPST) contact form rated for common voltages used in commercial equipment. It handles substantial electrical loads, making it suitable for switching higher-current circuits when paired with the appropriate motor and enclosure.

• Voltage rating compatible with 208–277 V alternating current systems
• Contact arrangement: DPST (double pole, single throw) for simultaneous dual-circuit control
• High load capacity design for heavy-duty switching applications
• Use the recommended Intermatic motor assemblies and housings for safe operation

How easy is installation and daily operation?

Installation is straightforward for electricians and qualified technicians familiar with timer replacements; the mechanism fits specified Intermatic timer numbers and accepts standard mounting and motor connections. Daily operation is simple: set the tripper pins on the dial, start the timer, and use the manual override when you need temporary control.

• Direct-fit replacement for timer numbers G0428382, G2848361, G2997181
• Motor sold separately—install the proper Intermatic motor assembly
• Built-in manual override provides momentary or continuous control without changing programming
• Robust mechanical components minimize maintenance needs

What accessories and parts do I need to complete a working timer?

The T104M is the timer mechanism only; you'll need the correct Intermatic motor and the matching enclosure or clock housing to create a fully functional timer assembly. Trippers are included, but additional trippers and mounting hardware are available if you require more switching events or a different installation layout.

• Purchase compatible Intermatic motor assembly separately (motor specifications must match voltage and shaft fit)
• Use appropriate enclosure or panel mount listed for the timer model
• Extra trippers can be added to expand daily on/off operations up to 12 events
• Follow local electrical codes and hire qualified electricians for installation

Who is this for? The Intermatic T104M is aimed at contractors, facility managers, and DIY-savvy electricians who need a rugged mechanical timer mechanism for 208–277 V systems. It fits situations that demand dependable daily scheduling for lighting, HVAC control, pumps, or industrial equipment where a simple, maintainable mechanical solution is preferred over electronic timers. If you already have a compatible Intermatic housing and plan to pair the unit with a suitable motor, the T104M offers a straightforward, durable way to add time-based control to medium- and high-voltage circuits.