Overview
The Siemens 3RH2131-1BB40 is a SIRIUS auxiliary contactor relay designed for switching control signals within industrial control circuits. This contactor relay features 3 NO + 1 NC contact configuration, operates at 24 V DC, with Size S00 screw terminal design. Through the multiplication of outputs, simultaneous switching of several auxiliary circuits is possible, providing flexible control logic implementation in programmable logic controllers and soft starter applications.
Key Features
- Standard-compliant terminal designations and reliable, time-saving connection technology
- Can be outfitted with additional 4-pole auxiliary contact blocks in all contact arrangements for a total of 8 operating poles
- 30,000,000 mechanical service life operating cycles
- Climate-resistant design with high contact reliability and worldwide approvals including IEC and UL/CSA
- RC elements, varistors, diodes, or diode assemblies can be plugged onto the relay for damping opening surges in the coil
- Finger-safe according to EN 50274; units with ring lug terminal connection comply with IP20 protection degree when fitted with terminal cover
Technical Specifications
- Contact Configuration: 3 NO + 1 NC (3 normally open, 1 normally closed)
- Coil Voltage: 24 V DC
- Contact Rating: 10 AMP AC
- Frame Size: S00
- Terminal Type: Screw terminal
- Power Loss: 4 W (typical, at rated value of current without load current)
- Insulation Voltage: 690 V (IEC, degree of pollution 3)
- Surge Voltage Resistance: 6 kV
- Mechanical Service Life: 30,000,000 operating cycles (typical)
- Product Series: SIRIUS 3RH2
Typical Applications
The 3RH2131-1BB40 is widely used in:
- PLC control circuit logic implementation for motor starters and soft starters
- Auxiliary signal switching in automation control cabinets
- Secondary interlocking circuits requiring multiple contact outputs
- Electronic control systems requiring reliable contact multiplication
- Industrial machinery control panels operating on 24 V DC control power
Compatibility & Replacements
Compatible With
- Siemens SIRIUS modular control system components
- 3RT2 contactors (Size S00 to S3 accessories compatible)
- 24 V DC control power systems in industrial automation
- Soft starters and variable frequency drives requiring auxiliary control logic
- PLC control circuits with 24 V DC coil operating voltage
Replaces / Drop-In Replacement For
- Direct replacement for obsolete 3RH1131-1BB40 (Note: existing 3RH1911 auxiliaries, varistors, RC elements, or diodes require replacement)
Works With
- All Siemens SIRIUS control system architectures
- TIA Portal engineering platform (for programmed automation systems)
- 24 V DC control signal networks in plant-wide automation
- Standard IEC/EN terminal designation systems (EN 50011)
- Snap-on auxiliary switch block expansion modules
