Analogue Timer Switch IH 24H with 1 Module SRM 1C-16A

The Schneider Electric Acti9 IH 15335 analog time switch is a daily electromechanical timer designed to automatically switch electrical circuits on and off according to a user-defined schedule. It features a 24-hour programming cycle, 1 output channel, switching capacity of up to 16 A at 250 V AC with resistive load, and a minimum programming resolution of 15 minutes. Its compact format of just 1 module, 18 mm wide, makes it easy to install on DIN rail in residential, commercial, and small tertiary electrical panels.

Reference 15335 belongs to Schneider Electric’s Acti9 IH range and corresponds to the SRM version, without power reserve. This means the device does not have a battery or internal system to keep the clock running during a power outage. When a mains interruption occurs, it may be necessary to reset the current time once power is restored.

24-hour daily programming

The Schneider Electric 15335 operates with a 24-hour daily cycle. The configured program repeats automatically every day while the time switch remains powered and in automatic mode.

The user sets the on and off periods directly on the front time dial using mechanical segments, without the need for software, digital displays, or external devices.

This solution is especially practical for simple installations where a load needs to be activated at the same times every day.

Minimum intervals of 15 minutes

The programming dial is divided into 15-minute segments. Each segment allows you to define whether the output should remain on or off during that interval.

• Full cycle: 24 hours.
• Programming resolution: 15 minutes.
• Minimum interval between two operations: 15 minutes.
• Number of available segments: up to 48 ON periods and 48 OFF periods depending on the dial configuration.

This resolution is suitable for lighting, heating, pumps, ventilation, and other loads that do not require minute-by-minute programming.

Simple analog programming

Programming the Acti9 IH 15335 is done mechanically using the front dial. To define operating periods, the segments corresponding to each time slot are moved.

The system provides a direct visual indication of the configured daily program, making adjustment easy even for users who are not familiar with digital timers.

Manual override with three positions

In addition to automatic operation, the switch includes a front selector with 3 positions:

• 0: permanent off.
• Auto: operation according to the set time program.
• I: permanent on.

This function allows the program to be temporarily overridden without changing the configured segments, for example to keep an installation on or off during maintenance work or specific situations.

1 output channel up to 16 A

The Schneider Electric 15335 has 1 output channel. Schneider Electric specifies a switching capacity of:

• 16 A at 250 V AC with cos φ = 1.
• 4 A at 250 V AC with cos φ = 0.6.

The permissible current therefore depends on the type of load. The 16 A rating applies to a practically resistive load; for inductive loads, the switching capacity is lower.

Permissible power according to load type

The official Schneider Electric documentation provides indicative maximum load values for different lighting technologies:

• 230 V incandescent lamps: up to 1,000 W.
• 230 V halogen lamps: up to 1,000 W.
• Fluorescent tubes: up to 700 VA.
• CFL compact fluorescent lamps: up to 150 W.
• LEDs over 2 W: up to 300 W.
• LEDs under 2 W: up to 30 W.

When the load exceeds the permissible contact rating, the time switch should be used to control the coil of a properly sized contactor or power relay.

SRM version without power reserve

The abbreviation SRM identifies this variant as a model without power reserve.

This means that:

• It does not include a backup battery.
• It does not keep the clock running during a mains interruption.
• After a power cut, it may be necessary to set the clock again.
• The physical program segments remain in position and do not need to be reprogrammed.

Schneider Electric offers other variants called ARM that do include power reserve; reference 15335 corresponds specifically to the SRM version.

Approximate accuracy of ±1 second per day

Schneider Electric specifies for this time switch an approximate accuracy of ±1 second per day, non-cumulative according to the manufacturer’s stated conditions.

This accuracy is sufficient for daily scheduling applications where small shifts of a few seconds do not affect the intended operation.

230 V AC power supply

The specific official guide for references 15331, 15335, and 15336 indicates for model 15335:

• Supply voltage: 230 V AC.
• Frequency: 50 Hz.
• Power consumption: approximately 0.5 W.

The low consumption allows the time mechanism to remain permanently powered with very low energy impact.

Impulse withstand voltage of 4 kV

The time switch has a rated impulse withstand voltage of 4 kV, according to Schneider Electric’s stated characteristics.

This feature is part of the device’s insulation and electrical strength characteristics within its intended installation in low-voltage panels.

DIN rail mounting

The Acti9 IH 15335 is designed for installation on DIN rail inside modular electrical panels.

• Width: 18 mm.
• Space occupied: 1 standard 18 mm module.
• 9 mm steps: 2.
• Height: approximately 90 mm.
• Depth: approximately 66 mm.

Its single-module width makes it possible to add time control without taking up too much space in the panel.

IP20 protection

The time switch has an IP20 protection rating under the specified installation conditions.

As a modular device, it must be installed inside an enclosure or cabinet that provides the required degree of protection against the environment and prevents accidental access to live parts.

Applications of the Schneider Electric 15335

The 24-hour daily cycle and 15-minute interval programming make this time switch suitable for many simple automation applications:

• Shop window lighting.
• Illuminated signs.
• Outdoor lighting.
• Electric heating via contactor.
• Water heaters and storage heaters with proper switching.
• Circulation pumps.
• Fans and extractors.
• Compatible HVAC equipment.
• Irrigation systems.
• Small business automation.
• Residential installations.
• Loads that need to be switched on daily at repeating times.

Use with contactors for higher-power loads

Although the contact can switch up to 16 A with resistive load, in installations with motors, high-power heating elements, lighting with high inrush current, or other demanding loads, it may be advisable to use the 15335 only as a control element for a contactor.

In this way, the time switch controls the contactor coil, and the contactor performs the switching of the power load.

Technical characteristics of the Schneider Electric 15335

• Brand: Schneider Electric.
• Reference: 15335.
• Range: Acti9.
• Family: IH.
• Type: analog / mechanical time switch.
• Program: daily.
• Cycle: 24 hours.
• Number of channels: 1.
• Minimum resolution: 15 minutes.
• Minimum switching interval: 15 minutes.
• Weekly programming: no.
• Annual programming: no.
• Automatic summer/winter changeover: no.
• Manual operation: yes.
• Manual selector: 0 / Auto / I.
• Power reserve: no, SRM version.
• Supply voltage: 230 V AC.
• Frequency: 50 Hz according to the manufacturer’s specific guide.
• Consumption: approximately 0.5 W.
• Contact current with cos φ = 1: 16 A at 250 V AC.
• Contact current with cos φ = 0.6: 4 A at 250 V AC.
• Accuracy: ±1 s/day.
• Impulse withstand voltage: 4 kV.
• Maximum incandescent power: 1,000 W.
• Maximum halogen power: 1,000 W.
• Fluorescent tubes: up to 700 VA.
• CFL: up to 150 W.
• LED >2 W: up to 300 W.
• LED <2 W: up to 30 W.
• Mounting: DIN rail.
• Width: 18 mm.
• Height: approximately 90 mm.
• Depth: approximately 66 mm.
• Module width: 1 module of 18 mm.
• Protection rating: IP20.
• Color: white RAL 9003.
• Operating standard: EN 60730-1, type 1 BRTU for the SRM version.
• EAN: 3303430153351.

Simple daily programming in just one module

The Schneider Electric Acti9 IH 15335 offers a simple solution for automating loads that need to be switched on and off every day according to the same schedule. The mechanical dial allows the programmed periods to be viewed directly and modified without tools or digital menus.

Its 16 A resistive load capacity, 15-minute resolution, manual selector, and compact 18 mm DIN format make it a compact solution for home panels and small commercial panels.

Important: this reference is the SRM version without power reserve. In the event of a power outage, the clock does not continue running, so it must be checked and reset when power is restored. For inductive or high-power loads, the actual contact rating must be respected and a power contactor used when necessary.