The Siemens 3RT2926-1BB00 is a genuine SIRIUS varistor surge suppressor designed to protect contactor coils and control circuits from switching-induced voltage spikes. This compact accessory helps improve system reliability, reduce electrical stress on control components, and extend the service life of industrial automation equipment. It is specifically designed for Siemens SIRIUS 3RT2.2 contactors (Size S0) and provides effective protection against transient overvoltages generated during contactor operation.
Designed for 24–48V AC (50/60 Hz) and 24–70V DC control circuits, the 3RT2926-1BB00 absorbs and limits voltage surges that occur when contactor coils are energized or de-energized. This helps protect PLC outputs, timers, relays, sensors, and other sensitive control devices from electrical damage caused by switching transients.
The suppressor utilizes varistor technology, which provides fast and reliable transient voltage suppression while minimizing electromagnetic interference (EMI) within industrial control systems. By reducing electrical noise and voltage spikes, it helps improve switching performance, prevent nuisance tripping, and enhance overall system stability.
Featuring a compact clip-on mounting design, the 3RT2926-1BB00 can be installed quickly and easily onto compatible Siemens SIRIUS contactors without requiring additional wiring modifications. Its compact dimensions of 30 × 19 × 12 mm make it suitable for motor control centers (MCCs), control panels, OEM machinery, HVAC systems, and industrial automation applications where space optimization is important.
The unit supports installation in any mounting position and operates reliably in temperatures ranging from -25°C to +60°C, making it suitable for demanding industrial environments. It carries major international approvals including CE, UL, and CSA, ensuring compliance with global industrial standards.
As part of the trusted Siemens SIRIUS 3RT29 accessories range, the 3RT2926-1BB00 Varistor Surge Suppressor provides dependable coil protection, reduced maintenance requirements, and improved operational reliability for industrial motor control and automation systems.
| Specification | Details |
|---|---|
| Product Name | Varistor Surge Suppressor |
| Brand | Siemens |
| Series | SIRIUS 3RT29 |
| Model Number | 3RT2926-1BB00 |
| SKU | 3RT2926-1BB00 |
| Product Type | Surge Suppressor |
| Suppressor Design | Varistor |
| Rated AC Voltage | 24–48V AC |
| Rated DC Voltage | 24–70V DC |
| Frequency | 50/60 Hz |
| Voltage Type | AC/DC |
| Suitable For | Siemens SIRIUS 3RT2.2 Contactors |
| Contactor Size | S0 |
| Mounting Method | Clip-On |
| Function | Coil Surge Protection |
| Application | Transient Voltage Suppression & EMI Reduction |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -40°C to +80°C |
| Dimensions (W × H × D) | 30 × 19 × 12 mm |
| Net Weight | 4 g |
| Mounting Position | Any |
| Approvals | CE, UL, CSA |
| Product Family | Siemens SIRIUS Accessories |
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