Overview
The Siemens 3TH4244-0AK6 is a SIRIUS auxiliary contactor relay designed for demanding industrial switching applications. This 8-pole contactor features 4 normally open (NO) and 4 normally closed (NC) auxiliary contacts, enabling precise control of multiple circuit states simultaneously. Rated for 120V AC 60 Hz operation (or 110V AC 50 Hz), it combines compact Size 0 construction with robust DIN EN 50011 compliance, making it a drop-in solution for machine builders, system integrators, and maintenance professionals.
Key Features
- 8 total auxiliary contacts: 4 NO + 4 NC for flexible circuit logic
- 120V AC 60 Hz coil rating (alternative 110V AC 50 Hz)
- Screw terminal connections for secure, tool-friendly wiring
- Size 0 compact footprint minimizes panel space
- DIN EN 50011 and IEC 60050 compliance ensures global industrial standards
- IP20 front protection class suitable for indoor control cabinets
- Operating temperature range -25°C to +55°C supports varied environments
Technical Specifications
- Contact Configuration: 4 NO + 4 NC auxiliary contacts
- Coil Voltage: 120V AC @ 60 Hz (rated)
- Coil Voltage (Alternate): 110V AC @ 50 Hz
- Product Type: Auxiliary contactor (Size 0)
- Terminal Type: Screw terminals
- Operating Temperature: -25°C to +55°C
- Protection Class (IP): IP20
- Compliance Standards: DIN EN 50011, EN 61095, IEC 60050
- Weight: 0.438 kg
Typical Applications
- Machine control and interlocking circuits
- Motor starter auxiliary switching
- PLC-to-contactor interface logic
- Dual-state feedback monitoring in manufacturing automation
- Industrial HVAC and pump control systems
- Process equipment synchronization requiring simultaneous NO and NC actions
Compatibility & Replacements
Compatible With
- Siemens SIRIUS modular switching equipment
- IEC-standard control relays and contactor banks
- Industrial control cabinets rated IP20 or higher
- 24V, 48V, 120V, 230V auxiliary relay circuits
- Proportional and on-off machine control systems
Replaces / Drop-In Replacement For
- Previous Siemens 3TH42 series contactors with identical terminal pinout and coil rating
- Other Size 0 IEC auxiliary contactors with 4NO+4NC contact configuration
- Note: Always verify coil voltage, terminal type, and contact arrangement before substitution
Works With
- Siemens SIRIUS modular control systems and contactors
- TIA Portal (STEP 7) programming and documentation
- Industrial Ethernet networks via compatible control relay modules
- Standard 24V-230V PLC I/O modules and safety relays
