The Siemens 3RP1576-1NM208K is a star-delta electronic timer from the Siemens 3RP series, designed for industrial motor-control applications where a motor must transition from star starting to delta running after a defined time interval. It provides 1 NO instantaneous contact and 1 NO delayed contact for coordinating the control sequence. Current product listings identify a 3–60 second timing range and 200–240 / 380–440 V AC input voltage for this model.
The 3RP1576-1NM208K is specifically designed for star-delta motor starter circuits. It provides the timing required to coordinate the operation of the star and delta contactors.
A typical sequence is:
Start Command → Star Contactor ON → Time Delay → Star Contactor OFF → Delta Contactor ON
This allows the motor to start in star and transition to delta after the configured timing period.
The timer provides 1 normally open instantaneous contact.
This contact operates immediately according to the control condition and can be incorporated into the starter's control logic.
Typical uses include:
The exact function depends on the wiring of the complete control circuit.
The 3RP1576-1NM208K also provides 1 normally open delayed contact.
The delayed contact changes state after the selected timing interval and is used for the timed control sequence in the star-delta starter.
Typical uses include:
The available product information specifies a 3–60 second time range.
In a star-delta starter, the motor initially starts in star connection and changes to delta connection after the required delay.
A simplified sequence is:
Motor Start → Star Mode → 3–60 sec Timing → Delta Mode
Star-delta starting can help reduce starting-current effects compared with direct-on-line starting for suitable motors and loads.
The complete starter should include correctly selected:
Proper interlocking is essential to prevent the star and delta contactors from being energized at the same time.
The 3RP1576-1NM208K is listed with a 200–240 V AC / 380–440 V AC input-voltage configuration.
This makes the timer suitable for compatible star-delta control systems using the specified supply ranges.
The 3RP1576-1NM208K belongs to the Siemens 3RP electronic timer family, used for timing and sequence-control functions in industrial electrical systems.
The series is suitable for control applications involving:
The Siemens 3RP1576-1NM208K can be used in applications where star-delta motor starting is appropriate.
Typical applications include:
The suitability of star-delta starting depends on the motor design, load characteristics and starting requirements.
The 3RP1576-1NM208K is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.
Its dedicated star-delta function with 1NO instantaneous and 1NO delayed contacts provides a practical timing solution for conventional motor-control panels.
The Siemens 3RP1576-1NM208K provides a dedicated electronic timing solution for star-delta motor starters, combining 1NO instantaneous and 1NO delayed contacts with a 3–60 second timing range.
Its 200–240 / 380–440 V AC input configuration makes it suitable for compatible industrial star-delta control circuits. Siemens-related product listings and current Indian market listings identify this exact model as a star-delta timer.
For OEMs, panel builders and automation integrators, it provides a practical solution for coordinating star and delta contactors in industrial motor-control systems.
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:
It is a Siemens 3RP star-delta electronic timer with 1NO instantaneous and 1NO delayed contacts.
It is designed for star-delta motor-starting circuits, where a time delay is required to control the transition from star to delta operation.
It has 1 NO instantaneous contact.
It has 1 NO delayed contact.
The specified timing range is 3–60 seconds.
The model is specified for 200–240 V AC / 380–440 V AC.
It is a starting method in which the motor initially starts in star connection and then changes to delta connection after a defined time.
The timer coordinates the timing of the transition between the star and delta contactors.
Yes. Proper electrical and/or mechanical interlocking is essential to prevent simultaneous energization of the star and delta contactors.
You can explore the Siemens product range at SB Smart for Siemens electronic timers, contactors, overload relays and other industrial automation products.
| Specification | Details |
|---|---|
| Product Name | Electronic Star Delta Timer Relay |
| Manufacturer | Siemens |
| Series | SIRIUS 3RP |
| Model Number | 3RP1576-1NM208K |
| SKU | 3RP1576-1NM208K |
| Product Type | Star Delta Timer Relay |
| Function | Star-Delta Switching |
| Contact Configuration | 1 NO Instantaneous + 1 NO Delayed |
| Timing Range | 3 – 60 Seconds |
| Changeover Delay | 50 ms Fixed Delay |
| Control Supply Voltage | 200–240V AC / 380–440V AC |
| Frequency | 50/60 Hz |
| Technology | Solid-State Electronic Timer |
| Repeat Accuracy | Better than ±1% |
| Setting Accuracy | Better than ±5% |
| Mounting Type | 35 mm DIN Rail / Panel Mounting |
| Housing Width | 22.5 mm |
| Terminal Type | Screw Terminals |
| Status Indication | LED Indicators |
| Protection Rating | IP20 |
| Application | Star Delta Motor Starter Control |
| Suitable For | Three-Phase Induction Motors |
| Industrial Applications | Pumps, Compressors, HVAC, Conveyors, Mixers |
| Product Family | Siemens SIRIUS Timing Relays |
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