Siemens 3RT2946-1CF00 RC Element Surge Suppressor, 400-600V AC, for SIRIUS 3RT2.4 Contactors Original Brand New

Overview: Premium Contactor Coil Protection

The Siemens 3RT2946-1CF00 surge suppressor is a critical electrical accessory from the SIRIUS industrial controls portfolio, specifically designed to protect your 3RT2.4 power contactors from damaging voltage spikes. This high-quality component utilizes an RC element (Resistor-Capacitor) circuit, providing superior damping of inductive kickback when the contactor coil is de-energized.

Rated for a wide control supply voltage range of 400-600 V AC at both 50 Hz and 60 Hz, the 3RT2946-1CF00 ensures enhanced system reliability and a significantly extended service life for your valuable industrial equipment. This RC suppressor is an essential component for any control circuit operating within this high AC voltage range.

Key Benefit

• Extended Contactor Lifespan: Effectively dampens high-energy voltage transients (surge voltage) that occur during switch-off, which are the primary cause of premature wear and failure in contactor coils and contacts.
• Maximum Equipment Protection: Shields sensitive electronic devices, such as PLCs and control relays, connected in parallel from the destructive effects of coil-induced voltage peaks.
• Reliable Operation: Ensures consistent and fault-free switching performance in industrial control applications across a broad 400V to 600V AC voltage spectrum.
• Simple Integration: Designed for easy, reliable plug-in or clip-on mounting directly onto compatible Siemens SIRIUS 3RT2.4 contactors, simplifying installation and maintenance.
• Industrial Grade Quality: Manufactured by Siemens, guaranteeing a robust design and high-quality construction suitable for demanding industrial environments.

Technical Function

The RC element surge suppressor functions as a snubber circuit. When the contactor’s magnetic coil is rapidly switched off, the sudden collapse of the magnetic field induces a substantial reverse voltage spike (inductive kickback). The series combination of the resistor (R) and capacitor (C) in the 3RT2946-1CF00 works to absorb and dissipate this transient energy.

The capacitor momentarily stores the energy, while the resistor limits the discharge current, effectively “snubbing” the surge and preventing the transient overvoltage from reaching damaging levels across the coil terminals and the wider control circuit. This crucial function minimizes contact wear and coil insulation stress.

Specifications & Compatibility

• Product Number: 3RT2946-1CF00
• Manufacturer: Siemens
• Device Type: Surge Suppressor / Damping Element
• Suppressor Type: RC Element (Resistor-Capacitor)
• Operating Voltage: 400 V AC to 600 V AC (Alternating Current)
• Frequency: 50/60 Hz
• Compatibility: Specifically for Siemens SIRIUS 3RT2 contactors of size 3RT2.4 (check for specific series and size requirements).
• Installation: Direct connection/clip-in accessory for the contactor.
• Country of Origin: Czech Republic (CZ)
• Commodity Code: 85363010

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