The Siemens 3RP1511-1AP308K is an electronic on-delay timer from the Siemens 3RP series, designed for industrial automation, machine-control panels and electrical control systems. It features 1 C/O changeover contact and a short 0.5–10 second adjustable timing range, making it suitable for delayed switching, contactor sequencing, motor-control circuits and machine automation.
The 3RP1511-1AP308K belongs to the Siemens SIRIUS 3RP15 electronic timer family, used to introduce controlled time delays into industrial control circuits.
Electronic timers can coordinate the operation of:
Contactors
Relays
Motors
Pumps
Fans
Conveyors
Valves
Production machinery
Machine sequences
Process equipment
This makes the timer suitable for conventional electrical control panels and industrial automation systems.
The primary function of the 3RP1511-1AP308K is on-delay timing.
When the control signal is applied, the timer starts its timing cycle. After the selected delay has elapsed, the output contact changes to its operated state.
A simplified sequence is:
Control Signal ON → Preset Time Delay → Output Operates
This is useful when a machine function needs to start only after another electrical or mechanical 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 3RP1511-1AP308K provides an adjustable timing range of 0.5 to 10 seconds, making it suitable for short-duration industrial timing applications.
This range can be useful for:
Contactor sequencing
Motor-control delays
Machine interlocks
Conveyor start delays
Pump-control timing
Short process delays
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.
Typical uses include:
Contactor control
Relay logic
PLC inputs
Electrical interlocking
Status signalling
Sequence control
Auxiliary switching
Control-system feedback
The connected load must remain within the applicable contact ratings.
The corresponding 3RP1511-1AP30 configuration includes LED indication, providing visual feedback of the timer's operating condition.
This can be useful during:
Commissioning
Troubleshooting
Preventive maintenance
Control-panel inspection
Machine servicing
LED indication helps technicians identify timer activity more easily inside an electrical control panel.
The corresponding 3RP1511-1AP30 configuration supports 24 V AC, 200–240 V AC and 24 V DC control-supply options, with AC operation at 50/60 Hz.
The control supply must be matched to the exact product marking and the electrical requirements of the installation before energizing the timer.
The 3RP1511-1AP30 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 timer is installed according to the manufacturer's requirements.
The 3RP1511-1AP308K can be used wherever a short controlled on-delay is required in an industrial sequence.
The timer can introduce a delay before energizing a motor contactor or auxiliary control device.
It can coordinate delayed activation between conveyor sections or machine stages.
It can provide delayed pump activation following another control event.
It can introduce a controlled delay before activating ventilation equipment.
It can coordinate different stages within an automated machine cycle.
It can provide timing between different production or process operations.
The 3RP1511-1AP308K 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 3RP1511-1AP308K
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 option
200–240 V AC control supply option
24 V DC control supply option
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 timer operation during commissioning and maintenance.
AC/DC control options: Supports the specified control-supply configurations.
Screw terminals: Provides a familiar industrial wiring method.
Sequence control: Helps coordinate machine and process operations.
Compact solution: Suitable for industrial control-panel layouts.
The Siemens 3RP1511-1AP308K 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.
For OEMs, panel builders and automation integrators, it can be integrated with Siemens contactors, relays, PLCs and other industrial control components.
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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 3RP1511-1AP30 configuration includes LED indication.
The corresponding configuration supports 24 V AC, 200–240 V AC and 24 V DC control-supply options.
Yes. The corresponding 3RP1511-1AP30 configuration uses screw terminals.
It can be used in motor-control panels, pumps, fans, conveyors, production machinery, packaging equipment and process-control systems.
Yes. Its C/O contact can be incorporated into a suitable contactor-control circuit, provided the electrical ratings are compatible.
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 |
| Brand | Siemens |
| Series | SIRIUS 3RP |
| Model Number | 3RP1511-1AP308K |
| SKU | 3RP1511-1AP308K |
| Product Type | Electronic Timing Relay |
| Timing Function | On-Delay |
| Contact Configuration | 1 Changeover Contact (1 C/O) |
| Time Range | 0.5 – 10 Seconds |
| Control Supply Voltage | 24V DC / 24–200-240V AC |
| Voltage Type | AC/DC |
| Frequency | 50/60 Hz |
| LED Status Indicator | Yes |
| Mounting Type | 35 mm DIN Rail Mounting |
| Housing Width | 22.5 mm |
| Terminal Type | Screw Terminals |
| Repeat Accuracy | ±1% |
| Setting Accuracy | ±5% |
| Protection Rating | IP20 |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Contact Type | Electromechanical Relay Output |
| Application | Delayed Switching & Automation Control |
| Product Family | Siemens SIRIUS Timing Relays |
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