Siemens SIRIUS 3RH2911-1FC30 Front Auxiliary Switch Block, 3 NO, Screw Terminal Original Brand New

Overview

The Siemens SIRIUS 3RH2911-1FC30 is an essential front-mounted auxiliary switch block designed for seamless integration with Siemens 3RT2 contactors and 3RH2 contactor relays. As part of the reliable SIRIUS modular system, this component ensures enhanced control and signaling capabilities within your electrical circuits. Featuring three leading normally open (3 NO) contacts and secure screw terminals, it offers reliable switching performance and easy, tool-free installation.

Key Features & Specifications

• Product Brand: Siemens SIRIUS
• Product Type: Front Auxiliary Switch Block (Contactor Accessory)
• Model Number: 3RH2911-1FC30
• Contact Configuration: 3 NO (Normally Open) Contacts
• Switching Operation: Leading contacts (30 U)
  • Leading contacts close before the main contacts of the contactor.
• Terminal Design: Screw Terminals (Connections 57/58, 67/68, 77/78, -/-)
• Mounting: Front snap-on mounting for Contactor sizes 3RT2 and Contactor Relays 3RH2.
• IP Protection: IP20 on the front.
• Compatibility: Specifically designed for SIRIUS 3RT2 Power Contactors and 3RH2 Contactor Relays.

Benefits

• Enhanced Control Circuitry: Provides three independent, leading NO contacts to expand the control and signaling functions of your base contactor or contactor relay.
• Reliable Early Signaling (Leading): The “leading” contact functionality (30 U) ensures these auxiliary contacts close slightly before the main contactor poles, ideal for pre-signaling, interlocks, or circuit sequence control.
• Quick and Easy Installation: Simple, snap-on front mounting allows for tool-free assembly, saving time and labor costs.
• High Reliability: Designed for a long mechanical service life (typically 10 million operating cycles) and high electrical endurance, ensuring minimal downtime.
• Secure Connection: Robust screw terminals ensure a reliable and durable electrical connection for your control wiring.

Function and Application

The 3RH2911-1FC30 auxiliary switch is used to expand the number of auxiliary contacts on a standard contactor (3RT2) or control relay (3RH2). In control systems, these contacts are crucial for:

• Status Indication: Signaling the contactor’s energized state to PLCs or indicator lights.
• Control Logic: Implementing complex interlocking and sequential control operations.
• Safety Circuits: Serving as feedback contacts within monitoring or safety systems.

By providing three leading NO contacts, it is particularly valuable in applications requiring an early signal before the main power circuit is established.