The Live LFIS100 Fused Mains Switch is a robust, high-quality isolation and protection device designed for incoming supplies up to 100 amps in commercial and industrial applications. Constructed from non-combustible Bakelite material, this double pole fused switch isolator provides reliable performance and enhanced safety. Supplied complete with both 80A and 100A gG general purpose fuses and a cable shroud, it offers flexibility for various installation requirements. The unit accommodates cable capacities up to 35mm² and features a safety mechanism that prevents fuse removal unless the switch is in the OFF position. Manufactured to BS EN 60947-3 standards with CE approval, the LFIS100 delivers professional-grade isolation and protection for a wide range of electrical distribution applications.

Key Features of Live LFIS100 Fused Mains Switch

• 100A Rating: Suitable for incoming supplies and main distribution up to 100 amps.

• Double Pole Isolation: Switches both Live and Neutral conductors for complete circuit isolation.

• Non-Combustible Bakelite Construction: High-quality, flame-retardant material for enhanced safety.

• Two Fuses Included: Supplied with 80A and 100A gG general purpose fuses for conductor protection.

• Cable Shroud Included: Provides neat cable entry and additional protection.

• 35mm² Cable Capacity: Accommodates cables up to 35mm² maximum.

• Safety Interlock: Fuse can only be removed when switch is in OFF position for safe maintenance.

• Complies with BS EN 60947-3: Manufactured to international standards for switchgear and controlgear.

• CE Approved: Meets European safety and performance requirements.

• Compact Dimensions: Space-saving design: 122mm (W) x 78mm (H) x 52mm (D).

• Versatile Applications: Ideal for commercial and industrial incoming supply isolation.

• 250V AC 50Hz: Suitable for standard single-phase supplies.

Technical Specifications

Frequently Asked Questions (FAQs)

1. What is the difference between the 80A and 100A fuses supplied?
The unit includes both fuse ratings for installation flexibility. The 80A fuse can be used for derated applications or where lower protection is required, while the 100A fuse provides full-rated protection. Choose the appropriate fuse based on your circuit requirements.

2. Why is the safety interlock (fuse removal only in OFF position) important?
This safety feature prevents accidental contact with live parts during fuse replacement, ensuring the switch must be isolated before access is possible - a critical safety requirement for industrial and commercial installations.

3. What type of applications is this fused switch suitable for?
Ideal for incoming supply isolation in commercial buildings, industrial control panels, distribution boards, sub-mains protection, and as a main isolation switch for various electrical installations up to 100A.

4. What cable size should I use with this switch?
The unit accepts cables from 16mm² minimum up to 35mm² maximum. For 100A applications, 25mm² or 35mm² copper cable is typically recommended depending on run length and installation method.

5. Is this switch suitable for three-phase applications?
No, this specific model (LFIS100) is a double pole switch designed for single-phase applications. For three-phase isolation, a 4-pole switch would be required.