Overview
The Siemens 3RT1017-1BB42 is a compact IEC-rated power contactor from the SIRIUS family, purpose-built for switching and controlling AC-3 motor circuits. This 3-pole unit features a 12A rated current, a 24VDC coil, and 1 normally closed auxiliary contact, making it ideal for applications requiring flexible motor control, protection, and monitoring. Engineered in Germany by Siemens, this contactor delivers reliable performance in industrial and commercial control systems.
Key Features
- 3-pole configuration with 1 NC (normally closed) auxiliary contact for versatile circuit control
- AC-3 rated at 12A, 5.5 kW / 400V for motor switching and load handling
- 24VDC coil for remote control and automation integration
- Screw terminal connections for secure, reliable wiring (conductor size 20–16 AWG / 18–14 AWG / 12 AWG)
- DIN EN 50022 standard 35 mm rail mounting (screw and snap-on compatible)
- IP20 protection class and wide operating temperature range (−25 to +60°C)
- Modular SIRIUS design for fast, space-saving cabinet construction
Technical Specifications
- Coil Voltage: 24 VDC
- Rated Current (AC-3): 12 A @ 5.5 kW / 400V
- Motor Rating: 3 HP @ 230V; 7.5 HP @ 460V
- Main Contacts: 3-pole (NO)
- Auxiliary Contacts: 1 NC
- Terminal Type: Screw terminal
- Size: S00
- Mounting: 35 mm standard DIN rail (DIN EN 50022)
- Protection Class: IP20
- Operating Temperature: −25 to +60°C
- Weight: 0.26 kg
- Conductor Size Range: 20–16 AWG / 18–14 AWG / 12 AWG
Typical Applications
- Three-phase AC motor starting and control in manufacturing and process automation
- Pump and fan motor switching in HVAC and water treatment systems
- Machine tool control circuits and production line automation
- Auxiliary switching and remote control circuits in control cabinets
- OEM equipment and panel-mounted automation systems
Compatibility & Replacements
Compatible With
- 24VDC control systems and PLC auxiliary outputs
- DIN EN 50022 standard 35 mm mounting rails
- Industrial control cabinets and panel assemblies
- AC-3 motor circuits rated 3–7.5 HP (230–460V)
- Siemens SIRIUS thermal overload relays and auxiliary contact modules
- Standard three-phase AC power distribution systems
Replaces / Drop-In Replacement For
The 3RT1017-1BB42 is a direct replacement for earlier SIRIUS contactor models in the 3RT10 family with identical coil voltage and contact configurations. Verify compatibility with your system integrator before ordering to ensure matching auxiliary contacts and terminal types.
Works With
- Siemens SIRIUS modular system components (thermal relays, auxiliary contacts, surge suppressors)
- Standard industrial control relay logic and PLC-based automation
- DIN rail mounting assemblies and control enclosures
- AC motor protection and monitoring systems
