The Siemens 3RT2927-2PA01 is a genuine Siemens SIRIUS Pneumatic Time-Delayed Auxiliary Switch designed for mounting on compatible 3RT202 contactors. This pneumatic ON-delay auxiliary contact block provides an adjustable time delay of 1 to 30 seconds, making it suitable for applications where auxiliary contacts need to change state after a defined delay following contactor energization. Siemens identifies the device as an ON-delay pneumatic time-delay auxiliary switch with 1 normally open (NO) and 1 normally closed (NC) contact.
The 3RT2927-2PA01 is designed for S0-size Siemens SIRIUS 3RT2.2 contactors and provides a practical solution for motor control, industrial automation, sequential control, machine control panels, and electrical control systems. Its adjustable pickup delay time from 1–30 seconds allows engineers and panel builders to configure the required switching sequence according to the application.
This Siemens pneumatic timer auxiliary contact block features 1 NO and 1 NC delayed contacts, with both contacts participating in the delayed switching function. The device has an insulation voltage of up to 690 V under the specified conditions and an IP20 front protection rating. It is designed for reliable industrial switching applications and has a typical mechanical service life of up to 3 million operating cycles.
The Siemens 3RT2927-2PA01 is suitable for DOL motor starters, motor control panels, contactor control circuits, industrial automation systems, conveyor systems, pumps, compressors, HVAC control panels, OEM machinery, and sequential control applications where an adjustable ON-delay is required. Siemens also specifies that no additional auxiliary contacts may be fitted alongside this delayed auxiliary switch.
At SB Smart, Faridabad, we supply genuine Siemens SIRIUS auxiliary switches, time-delay modules, contactors, overload relays, motor protection devices, soft starters, MCCBs, MCBs, and industrial automation products with competitive pricing, GST invoices, technical support, bulk-order assistance, secure packaging, and delivery across Faridabad, Delhi NCR, and major cities throughout India.
Genuine Siemens SIRIUS Pneumatic Time-Delayed Auxiliary Switch
Model: 3RT2927-2PA01
Product Type: Pneumatic Time-Delay Auxiliary Switch
Function: ON-Delay
Adjustable Time Setting: 1–30 seconds
Auxiliary Contacts: 1 NO + 1 NC
Both auxiliary contacts are time-delayed
Designed for mounting on Siemens 3RT202 contactors
Contactor Size: S0
Insulation Voltage: 690 V
Front Protection Rating: IP20
Typical Mechanical Service Life: 3,000,000 operating cycles
AC-15 Operational Current: 6 A at 230 V
AC-15 Operational Current: 4 A at 400 V
AC-15 Operational Current: 2.5 A at 500 V
Maximum AC-12 Operational Current: 10 A
DC-13 Operational Current: 4 A at 24 V
Screw terminal connection
CE / UL / CSA / CCC suitability
Suitable for industrial automation and motor control applications
Siemens 3RT202 Contactor Control
Motor Control Panels
DOL Motor Starters
Industrial Automation Panels
Sequential Control Systems
Conveyor Control Systems
Pump Control Panels
Compressor Control Systems
HVAC Control Panels
OEM Machinery
Factory Automation
Machine Control Panels
Industrial Switching Applications
Time-Delayed Contactor Control
Motor Starter Assemblies
Provides adjustable 1–30 second ON-delay
Enables controlled sequencing of auxiliary circuits
Helps coordinate motor control operations
1 NO + 1 NC configuration provides flexible control options
Pneumatic timing mechanism provides dedicated time-delay functionality
Easy mounting on compatible Siemens SIRIUS contactors
Compact S0-size accessory saves panel space
High mechanical service life supports long-term industrial operation
Suitable for industrial automation and motor control applications
Simplifies time-delayed auxiliary switching
Helps improve control-system sequencing and reliability
Genuine Siemens SIRIUS accessory
The Siemens 3RT2927-2PA01 is a pneumatic time-delayed auxiliary switch used with compatible 3RT202 contactors to provide an adjustable ON-delay for auxiliary contact switching.
The adjustable ON-delay range is 1 to 30 seconds.
The 3RT2927-2PA01 has 1 normally open (NO) and 1 normally closed (NC) auxiliary contact. Both contacts are delayed.
The accessory is designed for mounting on Siemens SIRIUS 3RT202 contactors, corresponding to S0 contactor size.
The 3RT2927-2PA01 is an ON-delay auxiliary switch. Siemens lists 3RT2927-2PR01 separately for the OFF-delay function.
The maximum operational current of the auxiliary contacts at AC-12 is 10 A.
The auxiliary contacts are rated 6 A at 230 V AC-15, 4 A at 400 V AC-15, and 2.5 A at 500 V AC-15.
The typical mechanical service life is 3 million operating cycles when used with the specified 3RT2.2 contactor.
Siemens specifies that no additional auxiliary contacts are permitted in addition to this pneumatic time-delay auxiliary switch.
The front of the auxiliary switch has an IP20 protection rating.
SB Smart, Faridabad supplies genuine Siemens SIRIUS time-delay auxiliary switches, contactors, overload relays, motor protection products, and industrial automation components with competitive pricing, GST invoices, technical support, bulk-order assistance, secure packaging, and delivery across Faridabad, Delhi NCR, and India.
| Specification | Details |
|---|---|
| Product Name | Pneumatic Delay Block |
| Brand | Siemens |
| Series | SIRIUS 3RT29 |
| Model Number | 3RT2927-2PA01 |
| SKU | 3RT2927-2PA01 |
| Product Type | Pneumatic Timer Block |
| Timing Function | ON Delay |
| Adjustable Delay Time | 1 – 30 Seconds |
| Contact Configuration | 1NO + 1NC |
| Delayed Contacts | 1 NO Delayed, 1 NC Delayed |
| Operating Principle | Pneumatic |
| Compatible Contactor Series | Siemens SIRIUS 3RT2 |
| Suitable Contactor Size | S0 |
| Compatible Contactors | 3RT202 Series |
| Mounting Method | Clip-On |
| Terminal Type | Screw Terminals |
| Rated Insulation Voltage (Ui) | 690 V |
| Protection Class | IP20 |
| Mechanical Service Life | 3 Million Operations |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -50°C to +80°C |
| Mounting Position | Any |
| Standards & Approvals | CE, UL, CSA, CCC |
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