The Siemens 3RP1525-1AP308K is an on-delay electronic 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 broad adjustable timing range, making it suitable for delayed switching, machine sequencing and process-control applications.
Siemens product information identifies the 3RP1525-1AP30 as an electronic on-delay timing relay with 1 changeover contact, 15 time ranges covering 0.05 seconds to 100 hours, LED indication and screw terminals. The listed control supply configuration for this variant includes 24 V AC, 200–240 V AC and 24 V DC at 50/60 Hz.
The 3RP1525-1AP308K belongs to the Siemens 3RP electronic timer family, used to introduce controlled time delays into industrial control circuits.
It can be incorporated into systems controlling:
Contactors
Relays
Motors
Pumps
Fans
Conveyors
Valves
Production machinery
Machine sequences
Process equipment
This makes it suitable for conventional electrical control panels as well as industrial automation applications.
The primary function of the 3RP1525-1AP308K is on-delay timing.
When the control signal is applied, the timer begins counting the selected time period. The output contact changes to its operated state after the configured delay has elapsed.
A simple sequence is:
Control Signal ON → Preset Time Delay → Output Operates
This is useful when a machine function needs to start only after another condition has been active for a specific period.
Typical applications include:
Delayed motor starting
Delayed contactor energization
Conveyor sequencing
Pump-control sequences
Fan-control applications
Machine sequencing
Process timing
Auxiliary control circuits
The 3RP1525-1AP308K provides a broad adjustable timing range of 0.05 seconds to 100 hours across 15 selectable time ranges.
This allows the timer to be used for both short switching delays and longer industrial process sequences.
The selected timing range should be configured according to the actual machine sequence and process requirements.
The product is specified with 1 C/O contact, also called a changeover contact.
A changeover contact provides a common connection with normally open and normally closed contact paths, giving flexibility when integrating the timer 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 should always remain within the applicable contact ratings.
The 3RP1525-1AP308K configuration includes LED indication, providing a visual reference for the timer's operating state.
This can be useful during:
Commissioning
Troubleshooting
Maintenance
Control-panel inspection
Sequence verification
Visual indication can help technicians quickly identify timer activity within a control cabinet.
The corresponding 3RP1525-1AP30 configuration is specified for 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 always be matched to the exact product marking and electrical installation requirements before energizing the timer.
The Siemens 3RP1525-1AP30 family uses screw terminals, providing a familiar connection method for industrial control panels and electrical cabinets.
This supports practical wiring, commissioning and maintenance when installed according to the manufacturer's requirements.
The 3RP1525-1AP308K can be used wherever a controlled delay is required in an industrial sequence.
Typical applications include:
The timer can introduce a delay before energizing a motor contactor or auxiliary control device.
It can coordinate the startup or sequencing of conveyor sections and machine stages.
It can provide delayed activation where pump operation must follow another control event.
The timer can introduce a controlled delay before equipment activation.
It can coordinate different stages of an automated machine cycle.
It can provide timing between different production or process steps.
The 3RP1525-1AP308K 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, 15 selectable time ranges, LED indication and screw terminals makes it suitable for a broad range of industrial control applications.
Siemens 3RP electronic timer
Article number 3RP1525-1AP308K
On-delay timing function
1 C/O changeover contact
0.05 second to 100 hour timing range
15 selectable time ranges
LED indication
Screw terminals
24 V AC control supply option
200–240 V AC control supply option
24 V DC control supply option
Suitable for industrial automation
Suitable for machine-control panels
Suitable for relay and contactor control
Suitable for OEM machinery
Wide timing range: Supports short delays through long process intervals.
15 time ranges: Provides flexibility for different automation requirements.
On-delay operation: Delays output switching until the selected time has elapsed.
1 C/O contact: Provides flexible switching options.
LED indication: Makes timer status easier to observe during operation and maintenance.
Screw terminals: Provides a familiar industrial connection method.
Flexible control supply: Supports the specified AC and DC supply options.
OEM-friendly: Suitable for standardized industrial control-panel designs.
The Siemens 3RP1525-1AP308K provides a flexible on-delay timing solution for industrial automation and machine-control applications.
Its combination of a 0.05-second to 100-hour timing range, 15 selectable ranges, 1 C/O changeover contact and LED indication makes it suitable for applications ranging from delayed motor starting to longer process-control sequences.
For OEMs, panel builders and automation integrators, it can be integrated with Siemens contactors, relays, PLCs and other industrial control components.
SB Smart supplies Siemens industrial electrical and automation products across Faridabad, Gurgaon/Gurugram, Delhi NCR, Haryana, Noida, Punjab, Mumbai and all major cities across India.
Major delivery locations include:
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Hyderabad
Chennai
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Indore
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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 0.05 seconds to 100 hours across 15 time ranges.
On-delay means the timer waits for the selected period after the control signal is applied before switching the output to its operated state.
It has 1 C/O changeover contact.
Yes. The corresponding Siemens configuration includes LED indication.
The corresponding configuration supports 24 V AC, 200–240 V AC and 24 V DC control supplies.
Yes. The 3RP1525-1AP30 family uses screw terminals.
It can be used in motor-control panels, pumps, fans, conveyors, production machinery, packaging systems and process-control applications.
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 |
| Series | SIRIUS 3RP |
| Model Number | 3RP1525-1AP308K |
| SKU | 3RP1525-1AP308K |
| Product Type | On-Delay Timer |
| Timing Function | On-Delay |
| Contact Configuration | 1 Changeover Contact (1 C/O) |
| Time Range | 0.05 Seconds to 100 Hours |
| Number of Time Ranges | 15 Selectable Ranges |
| Control Supply Voltage | 24V DC / 24–200-240V AC |
| Frequency | 50/60 Hz |
| Voltage Type | AC/DC |
| Repeat Accuracy | ±1% |
| Setting Accuracy | ±5% |
| Thermal Current | 5 A |
| Contact Material | AgSnO₂ (Silver Tin Oxide) |
| Mounting Type | 35 mm DIN Rail Mounting |
| Housing Width | 22.5 mm |
| Terminal Type | Screw Terminals |
| Protection Rating | IP20 |
| LED Status Indication | Yes |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Mechanical Endurance | Up to 10 Million Operations |
| Application | Industrial Timing & Automation Control |
| Product Family | Siemens SIRIUS Timing Relays |
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