The Siemens 3RH1921-1HA22 is an auxiliary switch block designed for side-mounting onto Siemens SIRIUS 3RT10 series contactors (Sizes S00 and S0) using screw-type mounting. It provides 1 Normally Open (NO) and 1 Normally Closed (NC) mirror contact for control circuit feedback, interlocking, and status signaling. Rated for up to 690 V AC insulation voltage and 10 A operational current (AC-15), this block complies with IEC 60947-5-1 and features screw terminals with IP20 finger-safe protection. The screw-type side mounting provides a more secure mechanical attachment compared to clip-on variants, making it suitable for applications subject to high vibration. Typical applications include motor control panels, PLC feedback circuits, and industrial automation systems requiring reliable contactor status signaling.
FAQ
Q: What is the difference between 3RH1921-1HA22 and 3RH1921-1EA20?
A: Both provide 1 NO + 1 NC contacts. The key difference is the mounting method: 3RH1921-1EA20 uses clip-on side mounting, while 3RH1921-1HA22 uses screw-type side mounting for more secure attachment in high-vibration environments.
Q: Which Siemens contactors are compatible with 3RH1921-1HA22?
A: It is compatible with Siemens 3RT10 series contactors in Sizes S00 and S0. It mounts to the side of the contactor using screws.
Q: What are the contact ratings for AC-15 duty?
A: The contacts are rated for 10 A at 24 V AC and 110 V AC, 6 A at 230 V AC, and 3 A at 400 V AC under AC-15 utilization category.
Q: Is the screw mounting more reliable than clip-on mounting?
A: Screw-type mounting provides a more secure mechanical attachment, making it preferable for applications subject to high vibration or mechanical shock. Clip-on mounting is faster for installation but may be less secure in harsh environments.
Q: What is the insulation voltage rating of this auxiliary switch?
A: The rated insulation voltage (Ui) is 690 V AC, with a rated impulse withstand voltage of 6 kV per IEC 60947-5-1.
Q: Are the contacts suitable for safety circuits?
A: Yes, the contacts are mirror contacts compliant with IEC 60947-5-1, making them suitable for safety feedback and interlocking circuits.
Q: What is the operating temperature range for this device?
A: The 3RH1921-1HA22 operates reliably in ambient temperatures from -25°C to +60°C.
Q: Does this auxiliary block require a separate accessory for mounting?
A: No, the 3RH1921-1HA22 is designed to mount directly to the side of compatible 3RT10 contactors using the provided screw mounting points. No additional adapter is required for Sizes S00 and S0.
