Siemens 3RH1921-1CA01 SIRIUS Auxiliary Switch 1NC 690V Screw Terminal

The Siemens 3RH1921-1CA01 is a front-side auxiliary switch from the SIRIUS range, featuring 1 instantaneous NC contact with screw terminals. It snaps directly onto the front of 3RT1 contactors and carries an insulation voltage of 690 V and surge voltage resistance of 6 kV.

Technical specifications:

• MLFB: 3RH1921-1CA01
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type: Auxiliary switch, front-side snap-on
• Contact configuration: 1 NC instantaneous
• Insulation voltage: 690 V
• Surge voltage resistance: 6 kV
• Operational current AC-15 at 690 V: 1 A
• Operational current AC-12 at 24 V / 230 V: 10 A
• IP rating (front): IP20
• Mounting: snap-on to contactor front
• Terminal type: screw-type
• Conductor cross-section: 0.5 to 2.5 mm²
• Dimensions (WxHxD): 10 x 38 x 51 mm
• Operating temperature: -25 to +60°C
• Storage temperature: -55 to +80°C
• Mechanical service life: 10,000,000 operating cycles
• Electrical endurance AC-15 at 230 V: 200,000 operating cycles
• Net weight: 18 g
• Compatible contactors: 3RT10, 3RT12, 3RT145, 3RT146, 3RT147

Features and benefits:

• Snaps onto the front of 3RT1 contactors for fast installation without separate mounting hardware
• Mirror contact function per IEC 60947-4-1 when used with 3RT1, supporting safety monitoring circuits
• Mechanical service life of 10,000,000 operating cycles for long-term reliability
• Contact reliability of 1 faulty switching per 100 million operations at 17 V / 1 mA
• Compact 10 mm width minimises panel space in switchgear assemblies

Applications:

• Motor starter feedback and interlock circuits with 3RT10 and 3RT12 contactors
• Safety monitoring via mirror contact in IEC 60947-4-1 compliant motor starter assemblies
• Status signaling and indication in industrial switchgear panels
• Auxiliary control circuits for 3RT145, 3RT146, and 3RT147 contactor assemblies

Compliant with IEC 60947-4-1 (mirror contact function). Part of the Siemens SIRIUS 3RH19 range.

Also known as: Siemens 3RH1921-1CA01, SIRIUS 3RH19 front auxiliary switch, Siemens contactor auxiliary contact block.