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Percentage Timer
Percentage Timers for Repeat-Cycle and Duty-Cycle Control
ATC Diversified Electronics offers a range of percentage timers designed to control the ratio of ON time to OFF time within a repeating fixed-time cycle. By adjusting the percentage setting, operators can control how long a connected electrical load remains energized during each cycle without continuously switching the equipment manually.
Available configurations include traditional electromechanical percentage timers, solid-state percentage timers, models with cycle-progress memory, and compact repeat-cycle timers. These controls are well suited for applications involving heaters, industrial ovens, pumps, blowers, filters, process equipment, and other systems requiring repetitive ON/OFF control.
Depending on the model, ATC percentage timers offer multiple fixed cycle lengths, continuous percentage adjustment, high-capacity switching, solid-state timing, cycle-progress indication, or memory that preserves timing progress when power is interrupted.
Why Choose ATC Percentage Timers?
Adjustable Duty-Cycle Control: Percentage timers allow the ON portion of a repeating cycle to be adjusted as a percentage of the total cycle time, providing straightforward control of repetitive electrical loads.
Electromechanical and Solid-State Options: The ATC percentage timer family includes traditional 304C and 304E designs as well as solid-state 304G and 304GX models for applications requiring electronic timing control.
Multiple Cycle-Time Options: Selected 304 Series models offer 15-, 30-, and 60-second cycles, while the 304G platform also supports a 120-second range and configurable minute-based timing.
High-Capacity Switching: Selected electromechanical 304 Series percentage timers use heavy-duty contacts that can switch substantial electrical loads directly, reducing the need for additional control components in compatible applications.
Cycle-Progress Memory: The 304GX stores the progress of an active timing cycle when power is removed and resumes timing when power returns.
Continuous Repeat-Cycle Control: The CP Series provides continuous ON/OFF cycling with the circuit-closure time adjusted as a percentage of the fixed total cycle.
Percentage Timer Applications
Percentage timers are commonly used where an electrical load must cycle repeatedly rather than remain continuously energized. Applications include electrically heated equipment, industrial ovens, pumps, blowers, filters, laboratory equipment, process systems, and other machinery requiring adjustable repetitive ON/OFF operation.
They can also be used to regulate average energy input to compatible electrical heating equipment by changing how much of each fixed cycle the load remains energized.
Find the Right Percentage Timer
Selecting the right percentage timer or repeat-cycle timer depends on the required cycle length, percentage adjustment, supply voltage, electrical load, contact rating, panel space, timing technology, and whether the application requires cycle-progress indication or memory following a power interruption.
Explore the ATC percentage timers above to compare electromechanical, solid-state, memory, and compact repeat-cycle configurations. ATC Diversified Electronics can also assist with selecting a timer for heating equipment, industrial machinery, OEM systems, and other repetitive timing applications.
Percentage Timer FAQs
What is a percentage timer?
A percentage timer repeatedly switches an electrical output ON and OFF within a fixed total cycle. The percentage setting determines how much of each cycle the output remains energized.
How does a percentage timer work?
The timer divides a fixed repeating cycle into ON and OFF periods. If the timer is set to a higher percentage, the load remains energized for more of each cycle. A lower percentage reduces the ON portion while increasing the OFF portion.
What is duty-cycle control?
Duty-cycle control describes the percentage of a repeating cycle during which a load is energized. For example, increasing the percentage setting increases the ON time relative to the total cycle while the cycle itself continues to repeat.
What is the difference between a percentage timer and an interval timer?
A percentage timer continuously repeats an ON/OFF cycle and adjusts the relationship between the ON and OFF portions of that cycle. An interval timer typically energizes a load for one selected period and then switches it off when that interval ends.
What cycle times are available for ATC 304 Series Percentage Timers?
The 304C and 304E are available with 15-, 30-, and 60-second cycle options. The solid-state 304G platform provides configurable 15-, 30-, 60-, and 120-second ranges, with second-based ranges capable of being converted to minute-based ranges through configuration.
What is the difference between the 304C and 304E Percentage Timers?
Both are traditional ATC percentage timers with continuous adjustment and 15-, 30-, and 60-second cycle options. They differ in electrical switching capacity and available configurations, so the specific load and voltage requirements should be compared before selecting a model.
What is the ATC 304G Solid-State Percentage Timer?
The 304G is a solid-state percentage timer that uses integrated-circuit timing technology. It provides configurable cycle ranges, convenient percentage adjustment, cycle-progress indication, and a relay output for switching compatible electrical loads.
What does memory do on the 304GX Percentage Timer?
The 304GX stores cycle progress if electrical power is removed. When power is restored, the timer resumes the cycle from the stored position rather than beginning the timing cycle again from the start.
What is the ATC CP Series Percentage Timer?
The CP Series is a single-circuit repeat-cycle timer designed for continuous ON/OFF control. The circuit-closure time is adjusted as a percentage of the fixed total cycle, allowing repetitive load operation with minimal panel space.
Can percentage timers be used for electric heaters?
Yes. Percentage timers are commonly used to control wattage input to compatible electrically heated equipment by changing the proportion of each repeating cycle during which the heater is energized. The timer contact and electrical ratings must be suitable for the connected load.
What applications use percentage timers?
Applications include electrically heated equipment, industrial ovens, pumps, blowers, filters, laboratory equipment, process machinery, and other electrical systems requiring repetitive ON/OFF control within a fixed cycle.
How do I choose the right percentage timer?
Consider the required cycle time, supply voltage, load type, contact rating, desired percentage adjustment, available panel space, and whether the application requires solid-state timing, cycle-progress indication, or memory after a power interruption.