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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3SB3500-4LD21 |
| Alternative Part Number | 3SB35004LD21 |
| Manufacturer | Siemens |
| Design | Key-operated switch with 2 switch positions |
| Material of Activation Element | Metal |
| Colour of Activation Element | Silver |
| Outer Diameter | 28.5 mm |
| Switch Positions | 2 (O-I) |
| Switch Position for Key Removal | Position I |
| Actuating Angle | 50° clockwise |
| Front Ring Material | Metal |
| Front Ring Colour | Silver |
| Protection Class | IP67 |
| Operating Frequency Maximum | 1,000 operations/hour |
| Mechanical Service Life | Typically 300,000 switching cycles |
| Ambient Operating Temperature | -25°C to +70°C |
| Storage Temperature | -40°C to +80°C |
| Mounting Type | Front mounting |
| Installation Hole Shape | Round |
| Mounting Diameter | 22 mm |
| Environmental Category | 3K6 according to IEC 60721 during operation |
| Tightening Torque | 1.4 to 1.6 N·m for screws in the bracket |
| B10 Value | 50,000 with high demand rate according to SN 31920 |
| Proportion of Dangerous Failures | 20% at both low and high demand rates according to SN 31920 |
| Failure Rate | 100 FIT with low demand rate according to SN 31920 |
| T1 Value for Proof Test Interval | 20 years according to IEC 61508 |
The Siemens 3SB3500-4LD21 is a robust and reliable key-operated switch designed for a variety of industrial applications. This high-quality actuator is part of Siemens' commanding and signalling devices, offering precise control with its two switch positions. The actuator features a durable metal front ring in a sleek silver colour, ensuring it can withstand the rigours of industrial environments.
With an IP67 protection rating, the 3SB3500-4LD21 is dust-tight and can handle temporary immersion in water, making it suitable for use in challenging conditions. The actuator operates within an ambient temperature range of -25 to +70°C, ensuring consistent performance even in extreme temperatures.
Installation is straightforward, thanks to its front mounting design and standard 22mm round mounting diameter, which is a common size for industrial control panels. The mechanical service life of the switch is impressive, with up to 300,000 switching cycles, indicating a long-lasting and dependable performance.
The 3SB3500-4LD21 does not feature an emergency stop function, which allows for specialised use in applications where this functionality is not required or is provided by other means. The key-operated mechanism provides an additional layer of security and control, as it requires a physical key for operation, which can help prevent unauthorised access or tampering.
Overall, the Siemens 3SB3500-4LD21 is a high-quality, secure, and durable choice for industrial control applications where reliable and controlled access is essential.
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Frequently Asked Questions
What type of actuator does this key-operated switch have?
The key-operated switch comes with a round metal actuator and is designed for latching operation with two switch positions.
Can this switch be used in emergency stop functions?
No, the 3SB3500-4LD21 is not designed with an emergency stop function.
What is the protection class of this key-operated switch?
This key-operated switch is rated with a protection class of IP67, making it dust tight and protected against the effects of temporary immersion in water.
What are the ambient temperature limits for operating this switch?
The switch can operate within an ambient temperature range of -25 to +70 degrees Celsius.
What is the mechanical service life of this switch?
The mechanical service life of the switch is typically around 300,000 switching cycles.
What is the mounting type for this switch?
The switch is designed for front mounting with a round installation hole.
What is the mounting diameter required for this switch?
The required mounting diameter for the switch is 22 mm.
What is the vibration resistance of this key-operated switch?
The switch can resist vibrations according to IEC 60068-2-6 standards, with a frequency range of 20 to 200 Hz at 5g.
What is the maximum operating frequency of this switch?
The maximum operating frequency of the switch is 1,000 operations per hour.
What materials are used in the construction of the actuator and front ring?
Both the actuator and the front ring of the 3SB3500-4LD21 are made of metal, providing durability and a robust design.
