3SB3400-0E SIEMENS

3SB3400-0E Siemens Basis unit

Brand：SIEMENS Model number：3SB3400-0E

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

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Product Details：

Product Dimensions：

The 3SB3400-0E is a contact block engineered for front plate mounting, meaning it clips directly onto the holder attached to the back of a front-panel actuator. It provides a double-contact arrangement featuring 2 Normally Closed (NC) contacts with independent switching paths. This component is part of the legacy 22 mm Signum/3SB3 pushbuttons and indicator lights platform. It features integrated positive opening operation, a crucial mechanical characteristic for safety circuits, ensuring that even if contacts suffer minor welding, the mechanical actuation will physically force the contacts apart to open the circuit.

Product Parameters

Product Brand and Series: Siemens SIRIUS 3SB3 (Signum)
Component Type: Contact block for front-panel actuators
Contact Configuration: 2 Normally Closed (2 NC) contacts
Positive Opening Operation: Yes (complies with safety standards for opening circuits)
Terminal Connection Type: Screw terminals
Thermal Current (Ith): $10 \text{ A}$
Rated Insulation Voltage (Ui): $400 \text{ V}$ (Pollution class 3)
Surge Voltage Resistance: Rated value of $4 \text{ kV}$
Operating Voltage Ratings: Up to $400 \text{ VAC}$ at $50 \text{ Hz}$ , up to $300 \text{ VAC}$ at $60 \text{ Hz}$ , and up to $24 \text{ VDC}$ to $230 \text{ VDC}$ depending on utilization category
Operating Current (AC-15): $6 \text{ A}$ at $24 \text{ V}$ to $230 \text{ V}$ , and $3 \text{ A}$ at $400 \text{ V}$
Operating Current (DC-13): $3 \text{ A}$ at $24 \text{ V}$ , $0.7 \text{ A}$ at $110 \text{ V}$ , and $0.3 \text{ A}$ at $230 \text{ V}$
Contact Reliability: Extremely high, rated at one incorrect switching operation per 100 million operations ( $5 \text{ V}$ , $1 \text{ mA}$ )
Mechanical and Electrical Service Life: Typically 10 million switching cycles
Degree of Protection: IP40 for the overall housing enclosure inside a panel, IP20 for the individual connection terminals
Ambient Operating Temperature: $-25\text{°C}$ to $+70\text{°C}$ (Storage temperature up to $+80\text{°C}$ )
Tightening Torque: Recommended $0.8 \text{ N·m}$ for auxiliary contact screw connections

Product Advantages

A primary advantage of the 3SB3400-0E is its High Operational Safety. The positive opening function makes it fully compliant and reliable for safety-related control functions, such as the emergency stop buttons used to halt heavy equipment. The Exceptional Contact Reliability ensures that it can interface cleanly with low-current solid-state electronic controllers or PLCs without experiencing signal dropouts caused by oxidized surface films.

Its Compact Snap-On Architecture simplifies installation because it requires no tools to clip onto the actuator assembly, saving valuable labor time during panel build-outs. Furthermore, its massive mechanical endurance of 10 million cycles translates to zero maintenance or replacements over decades of normal industrial lifecycle use.

Important Considerations and Precautions

When configuring or working with the 3SB3400-0E, it is critical to realize its Discontinued Status. The entire 3SB3 product series has been phased out by Siemens and replaced by the modern SIRIUS ACT 3SU1 platform. The official preferred successor part number is 3SU1400-1AA10-1EA0. For retrofits or maintenance on existing control panels, stocking up on spare inventory or planning upgrades to the newer 3SU1 lines is heavily recommended.

During initial terminal installation, technicians must adhere strictly to the maximum tightening torque of 0.8 N·m; over-torquing can strip the internal threads of the plastic block housing, while under-torquing can lead to loose wires, localized overheating, or voltage drops.

For short-circuit protection of the auxiliary switches, you must install an appropriate fuse link matching type 1 coordination, specifically a gG / Dz 10 A fuse. Finally, keep in mind that the connection terminal protection rating is IP20, meaning it does not offer water resistance; it must be completely enclosed within a main electrical cabinet or control box that meets the application's overall IP rating requirements.

Product Applications

The 3SB3400-0E serves as the basic contact block for creating user interfaces on industrial controls panels across multiple domains.

Emergency Stop Stations: Paired with red mushroom-head pushbuttons to break the main power coil circuits when the button is hit.
Control Panels and Desks: Interfaced behind standard start/stop or directional pushbuttons on factory floor operator panels.
Material Handling Systems: Used in crane pendant controls or conveyor dispatch buttons to transmit mechanical operator actions to a control PLC.
CNC Machine Tools: Built into auxiliary panels for manual machine configuration, feed-hold commands, or tool cooling management.
Marine Control Applications: Mounted inside environmental control housings on maritime bridge consoles or engine room control arrays.

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