GE TH3366 - 600A, 600V, Fused Safety Switch

The GE TH3366 fused safety switch is your trusted solution for safe electrical isolation in demanding industrial and commercial settings. With a 600A rating and a 600V maximum, this robust device delivers dependable disconnection under load, helping you protect people, equipment, and the integrity of your power system.

Designed for practical, real-world use, the TH3366 combines strong protective features with straightforward operation that keeps downtime to a minimum. It’s built to integrate smoothly into daily maintenance workflows while supporting rigorous lockout/tagout (LOTO) procedures, so authorized personnel can secure circuits during service without guesswork.

Key advantages

• Fused protection for reliable fault clearance: The integrated fuses interrupt faults cleanly, safeguarding downstream wiring and equipment from overload and short circuits, and helping to prevent cascading failures.
• LOTO-ready design: Engineered to complement standard lockout/tagout practices, this safety switch provides a clear, controllable disconnect point that technicians can confidently secure during maintenance.
• Indoor durability with clear suitability: Housed in a NEMA 1 enclosure, it offers dependable protection in controlled indoor environments found in factories, warehouses, and commercial facilities.
• Long-term reliability under load: Built to endure repeated switching and sustained performance, preserving safe operation over time in busy electrical rooms and service panels.
• User-friendly service and maintenance: Designed for straightforward fuse replacement and routine checks, helping minimize downtime and keep systems running smoothly.
• Versatile application: Ideal for power distribution panels, service entrances, and machines that require secure, controlled disconnection and safe maintenance access.

Specifications at a glance

• Amperage rating: 600 A
• Voltage rating: 600 V
• Enclosure rating: NEMA 1
• Product type: Fused Safety Switch
• Brand: GE
• Model: TH3366

Practical use and installation tips

• Pair with properly sized fuses to align with your load profile and protection strategy, ensuring coordination with upstream breakers and downstream circuits.
• Plan for indoor installation only to match the NEMA 1 enclosure’s protection level and environmental expectations.
• Integrate with locking devices and tagout hardware to create a complete maintenance safety protocol, reducing the risk of inadvertent energization.
• Document labeling and clear disconnect indicators to streamline inspections, maintenance cycles, and compliance checks.

The GE TH3366 is a purpose-built solution for teams that value safety, reliability, and straightforward maintenance in power-distribution environments. If you need a dependable fused safety switch that stands up to daily demand while supporting rigorous lockout/tagout practices, the TH3366 delivers clear, measurable benefits for both operations and safety programs.