The Siemens 3RP1576-1NP208K is a star-delta electronic timer from the Siemens 3RP series, designed for motor-control applications where a controlled transition from star starting to delta running is required. It provides 1 NO instantaneous contact and 1 NO delayed contact, supporting the sequential operation of the star and delta contactors. Siemens India currently lists the corresponding 3RP1576-1NP20-8K as an active Star delta timer AC 2 product.
The 3RP1576-1NP208K is designed specifically for star-delta motor starting circuits. A star-delta starter initially connects the motor in star and then changes over to delta after the required time interval.
A typical sequence is:
Start Command → Star Contactor ON → Time Delay → Star Contactor OFF → Delta Contactor ON
The timer provides the timing functions required to coordinate this sequence.
The timer provides 1 normally open instantaneous contact.
This contact operates immediately according to the timer's control condition and can be used for immediate control-circuit functions.
Typical uses include:
The exact function depends on the wiring of the complete star-delta control circuit.
The 3RP1576-1NP208K also provides 1 normally open delayed contact.
The delayed contact changes state after the selected timing interval and can be used to control the required transition within the star-delta starter.
Typical uses include:
Available product information for this model identifies a 3–60 second time range and a 230–400 V AC input-voltage configuration.
The timer is useful for motors where star-delta starting is appropriate.
During starting, the motor is initially connected in star. After the configured delay, the control circuit changes the motor to delta operation.
This approach can help reduce starting-current effects compared with direct-on-line starting for suitable motor and load conditions.
The complete starter should include correctly rated:
Proper interlocking is essential to prevent simultaneous energization of star and delta contactors.
The 3RP1576-1NP208K belongs to the Siemens 3RP electronic timer family, used for timing and sequence-control functions in industrial electrical systems.
The 3RP range is suitable for applications involving contactors, relays, motors and automated machine sequences.
Typical applications include:
The 3RP1576-1NP208K can be integrated into conventional star-delta motor-control panels where timed changeover is required.
Typical applications include:
The suitability of star-delta starting depends on the motor design, load characteristics and starting requirements.
The 3RP1576-1NP208K is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.
Its combination of star-delta timing, 1NO instantaneous contact and 1NO delayed contact provides a practical solution for conventional motor-control panels.
The Siemens 3RP1576-1NP208K provides a dedicated electronic timing solution for star-delta motor starters. Its 1NO instantaneous and 1NO delayed contacts allow the control circuit to coordinate the initial star connection and subsequent delta transition.
The model is listed with a 3–60 second timing range, while Siemens India lists the corresponding 3RP1576-1NP20-8K as an active Star delta timer AC 2 product.
For OEMs, panel builders and automation integrators, it provides a practical solution for conventional star-delta 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 used 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.
Available product information specifies a 3–60 second time range.
It is a starting method where the motor initially starts in star connection and then transitions to delta connection after a defined time.
The timer coordinates the timing of the star-to-delta transition so that the motor-control sequence operates in the intended order.
Yes. The instantaneous and delayed contacts can be incorporated into a suitable star-delta contactor-control circuit.
Yes. Proper electrical and/or mechanical interlocking is essential to prevent the star and delta contactors from being energized simultaneously.
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 | 3RP1576-1NP208K |
| SKU | 3RP1576-1NP208K |
| Product Type | Star Delta Timer Relay |
| Function | Star-Delta Switching |
| Contact Configuration | 1 NO Instantaneous + 1 NO Delayed |
| Number of Outputs | 2 NO Contacts |
| Time Setting Range | 3 – 60 Seconds |
| Control Supply Voltage | 200 – 240V AC |
| Frequency | 50 / 60 Hz |
| Voltage Type | AC |
| Repeat Accuracy | ±1% |
| Setting Accuracy | ±5% |
| Mounting Type | Screw Mounting & 35 mm DIN Rail |
| Housing Width | 22.5 mm |
| Terminal Type | Screw Terminals |
| Contact Material | AgSnO2 (Silver Tin Oxide) |
| Protection Rating | IP20 |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Electrical Connection | Screw-Type Terminals |
| 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 |
No reviews yet.