The Siemens 3RP1576-1NQ308K is an electronic timer from the Siemens 3RP series, specifically designed for star-delta motor starting applications. It provides 1 normally open (1NO) instantaneous contact and 1 normally open (1NO) delayed contact, allowing the timer to coordinate the transition between the star and delta contactors in a motor-control circuit.
This makes it suitable for industrial motor starters where a controlled star-delta sequence is required to reduce the starting current and mechanical stress associated with direct-on-line starting.
The 3RP1576-1NQ308K is part of the Siemens 3RP electronic timing relay family, used for timing and sequence-control functions in industrial electrical systems.
Electronic timers can provide accurate switching delays for contactors, relays and other control devices.
For star-delta motor starting, the timer provides the required timing sequence between the star contactor and delta contactor.
A star-delta starter initially connects the motor windings in a star configuration and then changes over to a delta configuration after the preset timing period.
This starting method can help reduce the motor's starting current compared with direct-on-line starting.
A typical sequence is:
Start Command → Star Contactor ON → Time Delay → Star Contactor OFF → Delta Contactor ON
The 3RP1576-1NQ308K is designed to provide timing contacts required for this type of sequence.
The complete star-delta starter must be designed with appropriate contactors, overload protection, interlocking and motor ratings.
The product is specified with 1NO instantaneous contact.
An instantaneous contact changes state immediately according to the timer's control condition, without applying the timing delay.
This contact can be used for:
The exact function depends on how the timer is wired into the star-delta control circuit.
The timer also provides 1NO delayed contact.
This contact changes state after the configured timing interval, making it suitable for controlling the timed transition within a star-delta motor starter.
The delayed contact can be used for:
The exact timing behaviour depends on the selected timer configuration and control circuit.
The timer helps coordinate the switching between the star and delta contactors.
A typical control sequence can be represented as:
Motor Start → Star Connection → Preset Delay → Delta Transition
Proper electrical and mechanical interlocking between the star and delta contactors is essential to prevent both contactors from being energized simultaneously.
The 3RP1576-1NQ308K can be used in motor-control applications where star-delta starting is appropriate.
Typical applications include:
The motor, starter and timer must be selected according to the required power, current, starting characteristics and operating duty.
The 3RP1576-1NQ308K is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.
Its dedicated star-delta timing function and combination of instantaneous and delayed NO contacts provide a practical solution for conventional star-delta motor-control panels.
The Siemens 3RP1576-1NQ308K provides a dedicated timing solution for star-delta motor starters, combining 1NO instantaneous and 1NO delayed contacts in one electronic timer.
It is suitable for applications where the motor needs to start in star and transition to delta after a defined delay. The timer can work alongside appropriate star and delta contactors, overload protection and control components.
For OEMs, panel builders and automation integrators, it provides a practical solution for conventional star-delta motor-control panels.
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 electronic star-delta timer with 1NO instantaneous and 1NO delayed contacts.
It is designed for star-delta motor-starting circuits, where timing is required to control the transition from star to delta operation.
It has 1 NO instantaneous contact.
It has 1 NO delayed contact.
It is a motor-starting method in which the motor initially starts in star connection and then transitions to delta connection after a timed interval.
The timer coordinates the timed transition between the star and delta contactors, helping establish the intended starting sequence.
It can be used in industrial motor-control panels, pumps, fans, compressors, conveyors, production machinery and OEM equipment where star-delta starting is appropriate.
Yes. Its 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 | 3RP1576-1NQ308K |
| SKU | 3RP1576-1NQ308K |
| Product Type | Star Delta Timer Relay |
| Timing Function | Star-Delta Transition Control |
| Contact Configuration | 1 NO Instantaneous + 1 NO Delayed |
| Contact Type | Normally Open (NO) |
| Operating Principle | Electronic Timer Relay |
| Control Application | Star Delta Motor Starting |
| Mounting Type | DIN Rail / Panel Mounting |
| Timing Adjustment | Adjustable Timing Range |
| Output Function | Automatic Star-to-Delta Changeover |
| Switching Accuracy | High Precision Electronic Timing |
| Installation Environment | Control Panels & Motor Starter Panels |
| Suitable Motors | Three-Phase Induction Motors |
| Industrial Applications | Pumps, Compressors, HVAC, Conveyors, Mixers |
| Product Family | Siemens SIRIUS Timing Relays |
| Brand | Siemens |
| Usage Category | Motor Control & Industrial Automation |
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