3RH2911-2FB11
The Siemens SIRIUS 3RH2911-2FB11 is a pre-positioned auxiliary switch with identification code 11 U. It has one normally open and one normally closed (1 NO + 1 NC) contact. The normally open contact is the pilot contact, and the normally closed contact is the delay contact. It is connected with spring terminals and is suitable for 3RT2 contactors and 3RH2 contact relays to meet the timing interlocking requirements.
Product Positioning
The 3RH2911-2FB11 is a pilot/delay contact type of the SIRIUS 3RH29 front-mounted auxiliary switch. The contact action sequence is staggered from that of the main contacts, making it suitable for star-delta starting, forward/reverse switching, or interlocking circuits where the order of actions needs to be confirmed.
Core Product Advantages and Features
Leader/Delay Contact
Normally open is the pilot contact and normally closed is the delay contact, which can provide clear timing signals before and after the main contact operates.
Identification code 11 U
The contact configuration is indicated by the identification code 11 U, which facilitates comparison with the drawings and confirmation of the wiring on site.
Front-mounted snap-fit installation
It snaps directly onto the front of the 3RT2 contactor or 3RH2 contact relay, allowing for quick installation and replacement.
Spring terminal connection
Spring terminals eliminate the need for screws, are vibration-resistant, save time on wiring, and are suitable for large-scale wiring and equipment vibration environments.