Description
The Siemens 3RB2056-1FW2 is a heavy-duty solid state overload relay engineered for reliable motor protection in demanding commercial and industrial HVAC and electrical applications. Rated for 50 to 200 amps, this Size S6 relay delivers precise, electronic overload detection with Class 10 trip characteristics — making it well-suited for protecting motors that require fast-response overcurrent protection.
Designed for maximum installation flexibility, the 3RB2056-1FW2 supports both direct mounting to a compatible Siemens contactor and stand-alone panel installation, allowing integrators and technicians to configure the relay to suit the application. Pass-through current transformers (CTs) eliminate the need for direct line-current routing through the relay body, simplifying wiring in high-amperage circuits. Screw terminals provide secure, vibration-resistant connections for dependable long-term performance.
Key Features
- Current range: 50–200 amps
- Size S6 frame for compatibility with Siemens S6 contactors
- Class 10 trip class for fast motor overload response
- Solid state design for accurate, drift-free overload detection
- Pass-through CT configuration simplifies high-current wiring
- Screw terminal connections for secure, reliable wiring
- Dual installation modes: direct contactor mount or stand-alone panel installation
- Siemens 3RB20 series platform for broad system compatibility
Applications
- Commercial HVAC motor protection (air handlers, chillers, cooling towers)
- Industrial motor control centers (MCCs)
- Pump and compressor motor protection
- Fan and blower motor circuits
- Stand-alone or contactor-integrated motor starter assemblies
Product Specifications
- SKU / Part Number: 3RB2056-1FW2
- Brand: Siemens
- Relay Type: Solid State Overload Relay
- Current Rating: 50–200 A
- Frame Size: S6
- Trip Class: Class 10
- Terminal Type: Screw Terminals
- CT Type: Pass-Through
- Mounting: Direct to Contactor or Stand-Alone
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