Overview
Siemens 3RH1911-1FA11 is a front-mounted auxiliary contact block designed for use with SIRIUS Size S00 motor contactors (3RT1015, 3RT1016, 3RT1017 series). This auxiliary switch provides dependable auxiliary contacts for interlocking, signaling, and control circuit logic in industrial automation systems. The block is removable and easily integrated into existing contactor assemblies.
Key Features
- 1 normally open (NO) and 1 normally closed (NC) contact configuration
- Snap-on front mount design for Size S00 SIRIUS contactors
- Screw terminals for reliable wire connections (20–16 AWG / 18–14 AWG)
- Contact rating: 6 A at 230 VAC; 10 A maximum amperage
- IP20 enclosure rating; 2-pole design
- Voltage: 24 VDC coil compatible; 600 VAC auxiliary contact rated
Technical Specifications
The 3RH1911-1FA11 meets industry standards for auxiliary switching in motor control circuits. Ideal for low-current control logic where voltages ≤ 110 V and currents ≤ 100 mA ensure stable contact operation. For sensitive electronic circuits, minimum operating current is 1 mA at 17 V.
Typical Applications
- Motor starter interlocking and signal circuits
- Pilot device control logic and feedback signaling
- Contactor auxiliary contact expansion on compact S00 contactors
- Industrial control panels requiring 1NO/1NC auxiliary switching
Compatibility & Replacements
The 3RH1911-1FA11 mounts directly on SIRIUS Size S00 contactors. Replacement part: 3RH2911-1HA11 (newer generation). This unit is widely distributed by authorized Siemens partners and industrial suppliers. When ordering, confirm Size S00 contactor compatibility and verify auxiliary contact requirements match your control circuit specifications.
