The Siemens 3RT2936-1BC00 is a genuine SIRIUS varistor surge suppressor designed to protect contactor coils and control circuits from switching-induced voltage spikes. Installed directly across the contactor coil, this compact accessory limits transient overvoltages and helps safeguard PLC outputs, timers, relays, sensors, and other sensitive control equipment from electrical stress. Similar Siemens varistor suppressors in this series are designed specifically for contactor coil protection and industrial automation applications.
The 3RT2936-1BC00 is intended for 24–48V AC (50/60 Hz) and 24–70V DC control circuits. By suppressing the back EMF generated when a contactor coil is de-energized, the varistor helps improve system reliability, reduce electrical noise, and extend the service life of switching devices. Equivalent Siemens SIRIUS varistor suppressors for S2 and S3 contactors use the same voltage range and surge protection principle.
Designed for seamless integration with Siemens SIRIUS 3RT2 contactors, the 3RT2936-1BC00 features a compact clip-on mounting design that enables quick installation without additional wiring modifications. Its space-saving construction makes it ideal for motor control centers (MCCs), control panels, automation systems, and OEM machinery. Similar SIRIUS suppressors are designed for direct mounting and compact panel integration.
The varistor suppressor effectively minimizes electromagnetic interference (EMI), prevents nuisance tripping, reduces contact wear, and enhances overall control system stability. These benefits contribute to improved operational reliability and lower maintenance costs in industrial environments where frequent switching operations occur.
Manufactured according to Siemens quality standards, the 3RT2936-1BC00 provides dependable long-term performance and full compatibility with Siemens motor control equipment. It is commonly used in manufacturing facilities, HVAC systems, process industries, water treatment plants, machine-building projects, and industrial automation installations.
| Specification | Details |
|---|---|
| Product Name | Varistor Surge Suppressor |
| Brand | Siemens |
| Series | SIRIUS 3RT29 |
| Model Number | 3RT2936-1BC00 |
| SKU | 3RT2936-1BC00 |
| 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 |
| Compatible Series | Siemens SIRIUS 3RT2 |
| Suitable Contactor Size | S2 |
| Mounting Type | Clip-On |
| Function | Coil Surge Protection |
| Application | Transient Voltage Suppression |
| EMI Reduction | Yes |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -40°C to +80°C |
| Product Family | Siemens SIRIUS Accessories |
| Compliance | CE, UL, CSA, RoHS |
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