The Siemens 3RT2936-1BD00 is a genuine SIRIUS varistor surge suppressor designed to protect contactor coils and control circuits from damaging voltage spikes generated during switching operations. This compact accessory helps improve the reliability and service life of contactors by limiting transient overvoltages and reducing electrical stress on connected control devices. It is specifically designed for use with Siemens SIRIUS 3RT2.3 and 3RT2.4 contactors (Sizes S2 and S3).
The 3RT2936-1BD00 is suitable for 127–240V AC (50/60 Hz) and 150–250V DC control circuits. When installed directly across the contactor coil, the varistor absorbs switching surges and suppresses transient voltage peaks that could otherwise affect PLC outputs, relays, timers, sensors, and other sensitive automation equipment.
Designed for seamless integration with Siemens SIRIUS contactors, the suppressor features a compact plug-on / clip-on mounting design that enables quick installation without additional wiring modifications. Its space-saving construction allows easy integration into motor control centers (MCCs), switchboards, control panels, and industrial automation systems.
By suppressing coil-generated transients, the 3RT2936-1BD00 Varistor Suppressor helps prevent nuisance tripping, reduces electromagnetic interference (EMI), minimizes contact wear, and enhances overall system stability. These benefits contribute to longer equipment life, lower maintenance costs, and improved process reliability in demanding industrial environments.
The suppressor is engineered specifically for Siemens SIRIUS switching devices and provides dependable protection for contactor coils operating in manufacturing plants, process industries, HVAC systems, water treatment facilities, machine-building projects, and industrial automation installations.
As part of the Siemens SIRIUS 3RT29 accessories range, the 3RT2936-1BD00 delivers reliable long-term performance, full compatibility with Siemens contactors, and effective protection against switching-induced voltage surges, making it an essential accessory for modern motor control applications.
| Specification | Details |
|---|---|
| Product Name | Varistor Surge Suppressor |
| Brand | Siemens |
| Series | SIRIUS 3RT29 |
| Model Number | 3RT2936-1BD00 |
| SKU | 3RT2936-1BD00 |
| Product Type | Surge Suppressor |
| Suppressor Design | Varistor |
| Rated AC Voltage | 127–240V AC |
| Frequency | 50/60 Hz |
| Rated DC Voltage | 150–250V DC |
| Voltage Type | AC/DC |
| Compatible Contactor Series | Siemens SIRIUS 3RT2 |
| Suitable Contactor Sizes | S2, S3 |
| Compatible Contactors | 3RT2.3 and 3RT2.4 |
| Mounting Type | Clip-On / Plug-On |
| Function | Coil Surge Protection |
| Application | Transient Voltage Suppression |
| EMI Reduction | Yes |
| Product Family | Siemens SIRIUS Accessories |
| Compliance | CE, UL, CSA, RoHS |
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