Overview
The Siemens 3TY7 561-1A auxiliary switch block is a left-mount contact module designed for use with Siemens power contactors and electromagnetic starters. This proven industrial-grade component provides dependable auxiliary contact switching for control logic, status indication, and interlocking in automation systems. Compatible with contactor sizes 2–14, the 3TY7 561-1A integrates seamlessly into existing panel layouts and delivers millions of reliable switching operations.
Key Features
- Contact configuration: 1 NO (normally open) + 1 NC (normally closed) instantaneous contacts
- Mechanical durability: 10 million operating cycles rated service life
- Rated voltage: 690 V insulation (AC); 6 kV surge voltage resistance
- Contact specification: 24 V AC rated voltage; 10 A contact current
- Protection rating: IP20 front protection; suitable for control enclosures
- Mounting style: Snap-on left-mount for quick installation and removal
Technical Specifications
- Product Type: Auxiliary switch block
- Series: 3TY7
- Contact Configuration: 1NO + 1NC instantaneous
- Compatible Contactor Sizes: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
- Insulation Voltage (degree of pollution 3): 690 V AC
- Surge Voltage Resistance: 6 kV
- Contact Voltage Rating: 24 V AC
- Contact Current: 10 A
- Mechanical Life: 10,000,000 cycles
- Protection Class: IP20
- Weight: 0.048 kg (48 g)
- Mounting Method: Snap-on left or right orientation
- Standard Compliance: EN 60947-4-1; IEC 60947-5-1
Typical Applications
- Motor control and interlocking circuits
- Status indication and feedback monitoring
- PLC input signaling and contactor state reporting
- Soft starter and variable frequency drive auxiliaries
- Multi-zone industrial automation and machine control
Compatibility & Replacements
The 3TY7 561-1A is designed for Siemens 3RT, 3TF, and related industrial contactor families. It also serves as a direct replacement for the earlier 3TY7 561-1AA00 variant and compatible with 3TY7 561-1B series equipment. Always verify contactor size designation (2–14) and mounting orientation (left/right) before ordering. This switch block pairs with a wide range of automation voltage supplies and PLC input modules rated for 24 V AC control logic.
