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This document describes the Siemens 3VA1 / 3VA2 100...630A rail extension, a component designed to extend the busbar system for Siemens 3VA molded case circuit breakers (MCCBs). The rail extension is crucial for adapting the MCCB installation to various enclosure depths or busbar configurations, ensuring proper electrical connection and mechanical stability.
The rail extension serves as an intermediary component, extending the connection points of 3VA1 and 3VA2 series MCCBs to align with existing busbar systems or to create custom busbar arrangements. It facilitates the connection of MCCBs with current ratings from 100A to 630A. The extensions are available in different pole configurations (1p, 2p, 3p, 4p) to match the MCCB and busbar requirements.
The primary function is to bridge the physical gap between the MCCB terminals and the main busbars, allowing for flexible installation within various panelboard or switchboard designs. This is particularly useful when the MCCB's standard terminal position does not directly align with the busbar system due to space constraints, different busbar depths, or specific panel layouts. By providing an extended connection, the rail extension ensures a secure and reliable electrical path while maintaining the necessary clearances and insulation.
The design incorporates features for robust mechanical attachment to both the MCCB and the busbar, ensuring stability under operational conditions, including short-circuit forces. The various types of extensions (e.g., "Montage extern" for external mounting, "Anschluss" for connection) indicate different installation methods and configurations, catering to a wide range of application scenarios.
The manual provides detailed specifications for different current ratings and MCCB series (3VA1 and 3VA2), including dimensions and torque values.
Dimensions (Wmax, T, Lmin, H, Ø): These dimensions vary significantly depending on the specific rail extension type, current rating, and pole configuration. For instance, for a 3VA1 100/160A external mounting extension, Wmax is 22mm, T is 1-8mm, Lmin is 10mm, H is 12mm, and the diameter (Ø) for the screw is 6.6mm. For a 3VA2 400/630A external mounting extension, Wmax is 40mm, T is 2-12.5mm, Lmin is 15mm, H is 20mm, and the diameter (Ø) is 11mm. Similar variations apply to connection-type extensions.
Recommended Torque Values (Nm): The manual specifies torque values for tightening the connections. For example, for 3VA1 100/160A, the torque is 5 Nm for smaller connections and 8 Nm for larger ones. For 3VA2 400/630A, the torque can be as high as 20 Nm or 30 Nm, depending on the connection point. These torque values are critical for ensuring a secure electrical connection and preventing overheating or loose contacts. The "Nm -> MCCB" indication suggests that these torque values are specifically for the connection to the MCCB terminals.
Busbar Dimensions (for "Anschluss" type): The manual details compatible busbar dimensions, such as "2... 10 x 15.5 mm x 0.8 mm", "2... 8 x 20 mm x 1 mm", and "2... 8 x 24 mm x 1 mm". These specifications ensure compatibility with standard busbar systems.
The rail extension is designed for ease of installation and adaptability, offering several key usage features:
While the rail extension itself is a passive component and typically requires minimal direct maintenance, its proper installation is crucial for the overall system's reliability and safety. The maintenance considerations are primarily related to the initial installation and periodic checks of the connections:
In summary, the Siemens 3VA1 / 3VA2 rail extension is a vital accessory for flexible and safe integration of MCCBs into various electrical distribution systems. Its design prioritizes secure connections, ease of installation, and compatibility, all while adhering to strict safety standards.
General| Brand | Siemens |
|---|---|
| Model | 3VA1 100 Series |
| Category | Industrial Equipment |
| Language | English |
