Siemens 3RT29161CC00 Surge Suppressor, Varistor, 48-127V AC / 70-150V DC, for SIRIUS 3RT2 S0 Contactors

Unlike generic RC snubbers, the Siemens 3RT29161CC00 is a varistor-based surge suppressor engineered specifically for the SIRIUS 3RT2 contactor series, size S0. It plugs directly onto the contactor front, damping opening surges and protecting the coil circuit from voltage spikes in industrial control applications.

Highlights

• Varistor technology for effective overvoltage damping
• Wide operating range: 48–127 V AC and 70–150 V DC
• Plug-in front mounting for quick installation on S0 contactors
• Ambient operating temperature from -25 to +60 °C

In daily use

When a contactor coil is de-energised, it can generate high-voltage transients that stress nearby electronics. This suppressor absorbs those spikes, reducing interference and extending the life of the control system. Its compact, plug-in design requires no additional wiring, making it ideal for retrofits and new installations alike.

Full specifications

• Product type: Surge suppressor
• Suppressor technology: Varistor
• Operating voltage AC: 48–127 V
• Operating voltage DC: 70–150 V
• Compatible contactor series: Siemens SIRIUS 3RT2
• Compatible contactor size: S0
• Mounting type: Front plug-in
• Function: Damping of opening surges
• Application area: Industrial control, motor control
• Ambient operating temperature: -25 to +60 °C
• Storage temperature: -40 to +80 °C
• Protection against: Overvoltage, voltage spikes
• Electrical connection: Plug-in

Final note

The 3RT29161CC00 is a purpose-built accessory that ensures reliable switching and protects your automation investment from harmful transients.