The Siemens 3RP1511-1AQ308K is an electronic on-delay timer from the Siemens SIRIUS 3RP15 series, designed for industrial automation, machine-control panels and electrical control systems. It features 1 C/O changeover contact, a 0.5–10 second adjustable timing range, LED indication and screw terminals. The AC control supply configuration includes 24 V AC and 100–127 V AC, with 24 V DC also supported.
The 3RP1511-1AQ308K is designed to introduce a controlled time delay into industrial control circuits. Electronic timers of the Siemens 3RP15 family are used for control, starting and protective circuits where delayed switching is required.
Typical applications include:
Industrial automation
Machine-control panels
Motor-control systems
Conveyor systems
Pump-control circuits
Production machinery
Packaging equipment
Process automation
Relay and contactor control
OEM machinery
The primary function of the 3RP1511-1AQ308K is on-delay timing.
When the control voltage is applied, the timer starts its timing cycle. After the selected delay has elapsed, the output contact changes to its operated state.
A simple sequence is:
Control Signal ON → Preset Time Delay → Output Operates
This makes the timer useful when a machine function needs to start only after another condition has remained active for a defined period.
Typical applications include:
Delayed motor starting
Delayed contactor energization
Conveyor sequencing
Pump-start delay
Fan activation delay
Machine sequence control
Process timing
Auxiliary switching
The 3RP1511-1AQ308K provides an adjustable timing range of 0.5 to 10 seconds. Siemens product data confirms this timing range for the 3RP1511-1AQ30 configuration.
This range is suitable for short-duration industrial timing functions such as contactor sequencing, delayed machine operations and motor-control commands.
The required time setting should be selected according to the actual machine sequence and application requirements.
The timer is specified with 1 C/O changeover contact.
A C/O contact provides a common connection with normally open and normally closed contact paths, allowing flexible integration into different control circuits.
It can be used for:
Contactor control
Relay logic
PLC inputs
Electrical interlocking
Status signalling
Sequence control
Auxiliary switching
Control-system feedback
The connected load should remain within the applicable contact rating.
The 3RP1511-1AQ308K configuration includes LED indication, providing visual information about the timer's operating condition. Siemens identifies LED indication for the 3RP1511-1AQ30 configuration.
This can be useful during:
Commissioning
Troubleshooting
Preventive maintenance
Control-panel inspection
Machine servicing
The visual indication can help technicians identify timer activity during panel maintenance.
The 3RP1511-1AQ308K is specified for the following control-supply options:
24 V AC
100–127 V AC
24 V DC
The AC supply operates at 50/60 Hz.
The control supply must be matched to the actual product marking and electrical installation requirements before energizing the timer.
The 3RP1511-1AQ30 configuration uses screw terminals, providing a familiar connection method for industrial control panels and electrical cabinets.
This supports practical wiring, commissioning and maintenance when the device is installed according to the manufacturer's requirements.
The 3RP1511-1AQ308K can be used wherever a short, controlled on-delay is required in an industrial sequence.
It can introduce a short delay before energizing a motor contactor or auxiliary control device.
It can coordinate the delayed activation of conveyor sections or machine stages.
It can provide delayed pump activation following another control event.
It can introduce a short delay before activating ventilation equipment.
It can coordinate different steps within an automated machine sequence.
It can provide controlled timing between production or process operations.
The 3RP1511-1AQ308K is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.
Its combination of on-delay operation, 1 C/O contact, 0.5–10 second timing range, LED indication and screw terminals makes it a practical solution for conventional industrial control circuits.
Siemens SIRIUS 3RP electronic timer
Article number 3RP1511-1AQ308K
On-delay timing function
1 C/O changeover contact
0.5–10 second adjustable timing range
LED indication
Screw terminals
24 V AC control supply
100–127 V AC control supply
24 V DC control supply
50/60 Hz AC operation
Suitable for industrial automation
Suitable for machine-control panels
Suitable for relay and contactor control
Suitable for OEM machinery
On-delay operation: Delays output switching until the selected time has elapsed.
0.5–10 second range: Suitable for short industrial timing requirements.
1 C/O contact: Provides flexible switching options.
LED indication: Helps technicians identify the timer's operating status.
AC/DC control options: Supports the specified AC and DC control supplies.
Screw terminals: Provides a familiar industrial wiring method.
Sequence control: Helps coordinate machine and process operations.
Compact industrial solution: Suitable for electrical control panels and automation systems.
The Siemens 3RP1511-1AQ308K provides a practical on-delay timing solution for industrial automation and machine-control applications.
Its 0.5–10 second timing range, 1 C/O changeover contact, LED indication and screw-terminal design make it suitable for delayed motor starting, contactor sequencing, conveyor control, pump activation and auxiliary switching applications.
Important for procurement: Siemens currently marks the 3RP1511-1AQ30 configuration as phased out, with 3RP2511-1AW30 identified as the preferred successor. This is important when sourcing the product for a new installation or replacement.
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Major delivery locations include:
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And other major cities across India
It is a Siemens 3RP on-delay electronic timer with 1 C/O changeover contact.
The timer provides an adjustable range of 0.5–10 seconds.
On-delay means the timer waits for the selected period after the control signal is applied before changing the output to its operated state.
It has 1 C/O changeover contact.
Yes. The corresponding 3RP1511-1AQ30 configuration includes LED indication.
It supports 24 V AC, 100–127 V AC and 24 V DC control supply options.
Yes. The product configuration uses screw terminals.
It can be used in motor-control panels, pumps, fans, conveyors, production machinery, packaging equipment and process-control systems.
No. Siemens currently lists the 3RP1511-1AQ30 as a phased-out product and identifies 3RP2511-1AW30 as the preferred successor.
You can explore the Siemens product range at SB Smart for Siemens electronic timers, contactors, relays and other industrial automation products.
| Specification | Details |
|---|---|
| Product Name | Electronic On-Delay Timer Relay |
| Manufacturer | Siemens |
| Series | SIRIUS 3RP |
| Model Number | 3RP1511-1AQ308K |
| SKU | 3RP1511-1AQ308K |
| Product Type | On-Delay Timer |
| Timing Function | On-Delay |
| Contact Configuration | 1 Changeover Contact (1 C/O) |
| Time Range | 0.5 – 10 Seconds |
| Control Supply Voltage | 24V AC / 100–127V AC / 24V DC |
| Voltage Type | AC/DC |
| Frequency | 50/60 Hz |
| Repeat Accuracy | < ±1% |
| Setting Accuracy | < ±5% |
| Thermal Current | 5 A |
| Mounting Type | 35 mm DIN Rail Mounting |
| Housing Width | 22.5 mm |
| Terminal Type | Screw Terminals |
| Status Indication | LED Indicators |
| Protection Rating | IP20 |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -40°C to +80°C |
| Mechanical Endurance | Up to 30 Million Operations |
| Contact Material | AgSnO₂ (Silver Tin Oxide) |
| Application | Delayed Switching & Automation Control |
| Product Family | Siemens SIRIUS Timing Relays |
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