Product Family Overview

The SALIT load break switch is a disconnector switch designed per IEC/EN 60947-3 standards, featuring double interruption technology for high short-circuit making capacity. It supports universal mounting on plates for easy integration into type-tested switchgear assemblies (IEC/EN 60439-1). Key features include high personal and operational safety, high switching and short-circuit resistance, compact size, and multifunctional use as main switch and emergency stop.

Product Definition and Application

SALIT switches comply with IEC/EN 60947-3 and utilize a snap-action mechanism for switching mixed resistive and inductive loads up to utilization category AC-23. Two product lines exist: SALIT-N (normal switching capacity) and SALIT-H (high switching capacity). Typical uses include main and sub-distribution in low-voltage switchgear up to 690 V AC for industrial and building installations. Mounting options include mounting plates and plug-in units for Motor Control Centers (MCC). Conversion kits enable combining two switches into a transfer switch with a common drive.

Product Construction

The switch is housed in a 3- or 4-pole plastic enclosure, mountable on plates or DIN rails (up to 125 A for SALIT-N). For ratings ≥160 A, the upper part is transparent to show the disconnection point. SALIT-H includes a side-mounted fourth pole. The snap-action mechanism and double contact interruption ensure high switching performance under overload and short-circuit conditions. Operation is via direct drive handles or door coupling drives with customizable shaft lengths. Up to two auxiliary switches can be mounted frontally for remote status signaling. Cable connections include terminal lugs and direct connection terminals (up to 63 A), with protective covers available.

Technical Specifications and Ordering Information

The product range covers rated operational currents from 40 A to 2000 A, with 3- or 4-pole configurations and neutral conductor switching options. Switching capacities are categorized as normal (SALIT-N) or high (SALIT-H). Cable connection types, packaging units, product types, and article numbers are detailed for precise ordering.

Accessories

A comprehensive accessory range supports installation and customization, including:

• Drive shafts and couplings for connecting switches to operating parts.
• Adapters for different shaft cross-sections.
• Direct drive handles for fixed door installation.
• Lockable door coupling rotary drives (IP65 off, IP40 on when opened by qualified personnel).
• Switched and non-switched neutral conductor kits for SALIT-H 4-pole versions.
• Auxiliary switches for remote position indication with galvanically isolated contacts.
• Transparent connection covers for 3-pole connections.
• Transfer switch kits to convert two SALIT-N switches into a transfer switch with separate or door coupling drives (up to 1000 A).

Dimensions and Mechanical Details

Detailed dimensional drawings specify mounting hole sizes, shaft lengths, and connection dimensions for various SALIT models (e.g., SALIT-N/40, SALIT-H/125), facilitating precise installation planning.

Electrical Specifications for SALIT NH Fuse Rails and Load Disconnectors

The SALIT NH fuse rails cover current ratings from 40 A to 2000 A, with rated operational voltages of 400 V, 500 V, and 690 V AC. Key electrical parameters include:

• Rated currents matching conventional thermal currents.
• Rated short-time withstand currents from 1 kA up to 36 kA depending on model.
• Short-circuit making capacities ranging from 1.4 kA to 76 kA.
• Conditional rated short-circuit currents with fuse links up to 100 kA.
• Pre-fuse ratings specified per model.
• Allowable fuse let-through currents from 9.7 kA to 90 kA.
• Joule integral (I2t) values indicating energy let-through, varying widely by model.
• Rated operating currents for utilization categories AC-21, AC-22, and AC-23, supporting motor loads up to 750 kW.
• Rated impulse withstand voltages between 6 kV and 12 kV.

Mechanical and Operational Characteristics

• Electrical life ranges from 100 to 2000 switching cycles depending on model.
• Mechanical life ranges from 1000 to 10,000 cycles.
• Weights vary from approximately 0.63 kg to over 18.5 kg.
• Connection details specify bolt diameters (M6 to M16), cable lug sizes, flat bar dimensions, and tightening torques (40 Nm to 60 Nm).
• Operating temperature range: -25 °C to +55 °C.
• Suitable for vertical and horizontal mounting, up to 2000 m altitude.
• Pollution degree 3 and overvoltage category III.
• Manual independent operation mode.

Product Types and Variants

Multiple SALIT types are available, identified by current rating, pole configuration, and mounting style, e.g., SALIT-N/40/3+1/K, SALIT-H/125/3/F, SALIT-N/2000/3/F. Each type includes detailed electrical and mechanical data to aid selection.

System Integration and Accessories

SALIT fuse rails and load disconnectors integrate with NH fuse holders, busbar systems, current transformers, distribution cabinets, and system electronics. They comply with DIN and BS standards, ensuring compatibility in industrial and commercial electrical distribution networks.

Critical Parameters and Best Practices

• Match rated current and voltage accurately to application needs.
• Observe pre-fuse ratings and allowable fuse let-through currents to maintain protection integrity.
• Follow installation guidelines for orientation, altitude, and environmental conditions.
• Use specified torque values for connections to ensure electrical and mechanical stability.
• Plan maintenance considering mechanical and electrical life ratings.
• Refer to ordering information for precise product codes and configurations.

Summary

This document provides a comprehensive technical reference for the SALIT load break switches and NH fuse rails, detailing their electrical and mechanical specifications, construction, accessories, and integration within standardized electrical distribution systems. It supports engineers, installers, and project planners in selecting, ordering, and installing these devices for reliable and safe operation in industrial and building electrical networks.