Siemens 3SB3400-0E Contact block

Description

Siemens 3SB3400-0E Contact block

Product Dimensions：

The Siemens 3SB3400-0E is a modular Contact Block from the legacy SIRIUS 3SB3 command and signaling devices series. It is designed to be clipped onto the rear of pushbuttons, selector switches, and indicator lights to translate mechanical actuation into electrical signals.

Product Detailed Description

The 3SB3400-0E is a standard contact block equipped with 1 NO (Normally Open) contact. It features a reliable snap-on design for quick assembly behind control panel components. It uses high-efficiency screw terminals for secure wire connections.

Product Status Note: The 3SB33/3SB3 series has been phased out by Siemens and replaced by the modern SIRIUS ACT (3SU1) series. However, the 3SB3400-0E remains widely utilized for maintenance, repair, and operational (MRO) replacements in existing control cabinets.

Technical Parameters

Product Advantages

• High Mechanical Life: Designed for heavy-duty industrial use with a lifespan reaching up to 10 million operations.
• Positive Contact Reliability: Equipped with self-cleaning contacts that ensure excellent signal transmission even under low-voltage and low-current conditions.
• Easy Toolless Installation: The modular snap-on design allows operators to quickly mount or replace the block onto the command holder without using special tools.
• Compact Footprint: Maximizes space inside the control console, allowing for multi-tier stacking of contact blocks behind a single actuator.

Important Considerations (Precautions)

• Lifecycle Management: Because this series is officially discontinued, ensure your inventory is secured for critical spares, or plan a migration path to the Siemens 3SU1400-1AA10-1BA0 (the equivalent SIRIUS ACT replacement module).
• Torque Specifications: Tighten screw terminals to the manufacturer-specified torque (0.8 to 1.2 Nm) to avoid loose connections, which can lead to localized heating or intermittent signaling.
• Environmental Exposure: The module itself is IP20-rated at the terminals. It must be installed inside an appropriately rated enclosure (IP54/IP65) if exposed to splashing liquids, heavy dust, or oil mists.

Product Applications

The 3SB3400-0E is found universally in industrial control interfaces:

• Control Panels & Consoles: Behind start buttons, stop buttons, and selector switches on manufacturing machinery.
• Material Handling: Used in crane pendant controls and conveyor control stations.
• Automotive Production: Integrated into worker station signaling and emergency stop sub-assemblies.
• Panel Building: General integration into power distribution boards for auxiliary signal tracking.

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