Siemens 5ST3 Connector Rail - 5ST3704
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Product Information
Full details
The Siemens 5ST3704 Connector Rail is designed for electricians and electrical installers working with Siemens 5SJ6 and 5SY series line protective switches. It simplifies the connection of these switches in 1 or 3-phase systems by providing a pre-fabricated busbar, eliminating the need for separate connection terminals for up to 35mm² stranded conductors. A key benefit is its excellent accessibility for feeder cables, streamlining installations. However, users should note its specific compatibility with Siemens distribution boards and accessories.
All features
| Model Part Number | 5ST3704 |
|---|---|
| Brand | Siemens |
Extended Product Information
FAQs
What is the maximum current rating of the 5ST3704 connector rail?
The current rating varies based on the connected conductor size. It is 50-90A for 10mm² conductors and 65-120A for 16mm² conductors at the infeed.
Can I use this rail with circuit breakers from other brands?
No, this connector rail is specifically designed for Siemens 5SJ6 and 5SY series circuit breakers and compatible Siemens distribution boards.
What conductor sizes can be connected without additional terminals?
Stranded conductors up to 35mm² can be connected without requiring separate connection terminals.
Is the 5ST3704 suitable for DC applications?
The product specifications indicate it is designed for 400V AC applications only.
How do I determine the correct length for the connector rail?
Measure the space available in your Siemens distribution board where the circuit breakers will be installed and the number of poles required. The rail can be cut to length.
What standards does the Siemens 5ST3704 comply with?
It complies with Din 57606 and Din 57659 standards.
Can I connect both single-sided and center-fed feeders?
Yes, the current ratings provided are applicable for both single-sided and center-fed connections.
Troubleshooting
Circuit breaker not engaging with the rail
Verify that the correct Siemens 5SJ6 or 5SY series breaker is being used and that the rail is properly seated in the distribution board. Ensure the pin connections on both the breaker and the rail are clean.
Overheating at the connection point
Check that the conductor size is within the specified range for the current load (10mm² for 50-90A, 16mm² for 65-120A). Ensure the conductor is fully inserted and secured. Verify the rail is rated for the total current being drawn.
Rail does not fit the distribution board
Confirm that the distribution board is a compatible Siemens model designed for this series of connector rail. Ensure the rail is oriented correctly for installation.
Pros and Cons
Pros
- Streamlines circuit breaker connections in Siemens systems.
- Reduces installation time and complexity.
- Accommodates a good range of conductor sizes without extra terminals.
- Offers good accessibility for maintenance.
- Meets relevant industry standards.
Cons
- Primarily designed for specific Siemens breaker series (5SJ6, 5SY).
- Limited to 400V AC applications.
- Requires compatible Siemens distribution boards.
- Multicolour product designation might not fit all aesthetic requirements.
Setup, Compatibility & Care
Setup:
- Ensure the power is completely disconnected before installation.
- Measure and cut the 5ST3704 rail to the required length.
- Mount the rail securely within the compatible Siemens distribution board.
- Connect the feeder cable to the appropriate end of the rail.
- Slide the Siemens 5SJ6 or 5SY series circuit breakers onto the pin connections of the rail.
Compatibility:
- This connector rail is specifically designed for Siemens 5SJ6 and 5SY series line protective switches.
- It is intended for use with Siemens distribution boards and accessories.
- Suitable for 2-pole (2P) Miniature Circuit Breakers.
- Maximum operating voltage is 400V AC.
- Compatible with stranded conductors up to 35mm² without additional terminals.
Care:
- Regularly inspect the rail and connections for any signs of wear, corrosion, or damage.
- Ensure connections remain clean and free of dust or debris.
- Perform maintenance only when the system is de-energized.