JKLESA T104M Mechanical Time Switch – 208-277 VAC, 40A DPST, Manual Override

Overview

Meet the JKLESA T104M mechanical time switch, a rugged scheduling solution designed for both indoor and outdoor use. Built to operate at 208-277 VAC with 60 Hz timing, it can switch up to 40 A per pole in a DPST configuration. This is a dependable, analog control option that helps you manage electrical loads with consistent, scheduled reliability.

Designed for real-world environments, the T104M delivers practical scheduling without the complexity of digital controls. It supports a 24‑hour cycle with up to 12 ON/OFF operations per day, and a minimum ON/OFF duration of one hour. Time intervals are available in 15-minute increments for more precise management, while a dedicated manual override lets you bypass the programmed schedule without interrupting ongoing cycles.

Durable by design, this timer accepts a wide operating range and features clearly marked terminals for straightforward installation. The included hardware and wiring diagram simplify setup, so you can implement reliable automation quickly and with confidence. Whether you’re aligning pool equipment, lighting, or ventilation, the T104M is built to perform with solid, mechanical reliability.

Key specifications

• Voltage and timing: 208-277 VAC, 60 Hz
• Load capacity: up to 40 A per pole, DPST
• Time interval: 15 minutes; operating temperature: -40 to 130 °F
• 24-hour control: up to 12 ON/OFF cycles per day
• Manual override to bypass programming
• Included trippers: 2 ON, 2 OFF; clear, marked terminals

Practical applications

The T104M is suited for a range of loads where reliable, scheduled operation matters. It enables straightforward control of pool pumps and heaters, blowers, indoor or outdoor lighting, signs, and filtration systems, all without the need for digital programming.

• Pool and spa equipment: maintain a consistent daily routine for pumps and heaters
• Lighting and signage: automate exterior or storefront illumination
• Ventilation and fans: regulate airflow during specific hours
• Filters and auxiliary devices: support regular maintenance cycles

What’s in the box and installation notes

Package includes the T104M timer, 2 ON trippers, 2 OFF trippers, and an instruction sheet. Terminals are clearly marked for easy wiring, and the accompanying diagram helps guide installation. A manual override provides immediate local control when needed, without disrupting ongoing cycles.