100A 3-Pole Miniature Manual Transfer Switch for 3-Phase Home/Shop Backup

For properties powered by a 3-phase electrical supply—such as large homes, workshops, farms, or small businesses—securing backup power requires a solution that safely manages all three phases. Our 100A 3-Pole Miniature Manual Transfer Switch is engineered specifically for this purpose. This compact, professionally-rated switch provides a code-compliant, permanent interface between your 3-phase utility supply and a 3-phase standby generator. It ensures that when you switch to backup power, all three phases are transferred simultaneously and safely, protecting sensitive 3-phase equipment (like pumps, compressors, or HVAC systems) and maintaining balanced operation while absolutely preventing any backfeed to the grid.

Key Features & Benefits:

1. Complete 3-Phase Safety & Isolation:

   • Feature: A 3-pole + neutral switching mechanism with a mechanical interlock. The rotary handle operates all three phase poles and the neutral in unison through “LINE,” “OFF,” and “GEN” positions.

   • Benefit: Guarantees full system isolation. Prevents single-phase backfeeding and protects 3-phase motors from damage caused by phase loss or imbalance during transfer. Ensures complete safety for utility workers and your electrical system.

2. Space-Optimized Design for 3-Phase Panels:

   • Feature: A true miniature design optimized to fit within the limited space of a residential or light commercial 3-phase distribution board.

   • Benefit: Eliminates the need for a large, separate enclosure. Simplifies installation for electricians and provides a clean, integrated look with your existing panel.

3. Robust Construction for Reliable Service:

   • Feature: Utilizes high-current, silver-plated copper contacts per pole and a durable cam-operated switching mechanism designed for the higher electrical demands of 3-phase systems.

   • Benefit: Delieves reliable performance and long contact life under 3-phase load conditions, ensuring dependable operation during critical power outages.

4. Intuitive, Fail-Safe Operation:

   • Feature: A clearly labeled, positive-action rotary handle provides unmistakable visual and tactile indication of the power source.

   • Benefit: Allows for simple, error-free manual control. The central “OFF” position provides a safe breakpoint for maintenance or system testing.

5. Engineered for Compliance & Integration:

   • Feature: Rated for 100A per phase and listed to UL 1008 for Transfer Switch Equipment. Designed to work with 3-phase generators and standard 3-phase inlets.

   • Benefit: Provides assurance of safety and performance that meets or exceeds electrical code requirements. Enables a professional, inspection-ready backup power installation.

Technical Specifications:

Parameter	Specification
Type	Manual Transfer Switch, 3-Pole + Neutral
Poles	3P + N (Switched Neutral)
Rated Current	100 Amperes per Phase
Voltage Rating	208V / 240V AC 3-Phase, 60Hz (or 400V / 230V AC, 50Hz)
Switching Mechanism	Mechanical Interlock, Rotary Handle
Position	LINE (Utility) – OFF – GENERATOR
Terminals	Designed for copper conductors (e.g., #4 AWG to #1/0 AWG)
Enclosure Rating	Suitable for mounting within a UL-listed panelboard enclosure.
Mounting	Flush Mount to DIN Rail or Panel Backplate
Safety Listing	UL 1008 Listed (Critical for North American Compliance)
Operating Temperature	-25°C to +60°C

Ideal Applications:

• Large Residences & Estates: Homes with 3-phase service for large HVAC systems, workshops, or agricultural equipment.

• Light Commercial & Workshops: Machine shops, auto repair garages, small manufacturing units, and professional studios.

• Agricultural & Rural Properties: Farms with 3-phase irrigation pumps, grain dryers, or processing equipment.

• Small Business Critical Power: Protecting servers, telecom equipment, and other essential 3-phase loads.

Value Proposition:

• Protect Major Investments: Safeguards expensive 3-phase machinery from damage caused by unsafe power switching or phase loss.

• Ensure Operational Continuity: Keeps critical 3-phase systems running during an outage, preventing business disruption or property damage.

• Professional Compliance: Delivers a certified, permanent installation that satisfies insurance and electrical inspection requirements.

• Future-Ready Infrastructure: Creates a safe, scalable connection point for a backup generator as part of a robust property management plan.

Critical Installation Notice:
This is a specialty device for 3-phase systems. Installation must be performed by a licensed electrician thoroughly familiar with 3-phase electrical systems and all applicable national and local electrical codes (NEC, CE Code, IEC regulations, etc.). Proper sizing of the generator and circuit breakers is essential.

Package Includes:

• 1 x 100A 3-Pole Miniature Manual Transfer Switch

• Mounting hardware

• Installation and wiring schematic