General Electric THMC33 - 100A, 3-Pole, Fused Disconnect Switch

The General Electric THMC33 is a 100A, 3-Pole Fused Disconnect Switch engineered for dependable electrical isolation in demanding industrial and commercial environments. Built to support proper lockout/tagout procedures, this switch delivers a clear, reliable disconnection under load, helping maintenance teams work safely and efficiently while protecting connected equipment.

Why the THMC33 stands out

• Three-pole fused design ensures all live conductors are simultaneously isolated, reducing the risk of partial energization during maintenance or service.
• 100A current rating provides robust protection for motor circuits, feeders, and other distribution lines without compromising performance.
• Lockout/Tagout readiness supports compliant, verifiable safety procedures, giving technicians a clear and enforceable shutdown method.
• Reliable disconnection under load engineered to interrupt current safely when the circuit is open, reducing arc exposure and equipment stress.
• Durable, long-term construction designed to withstand the rigors of busy facilities, delivering consistent performance over time.

Ideal applications and use cases

• Industrial facilities such as manufacturing floors, pumps, conveyors, and motor control centers where quick, secure power isolation is essential.
• Commercial buildings with critical HVAC, fans, and recallable loads that require dependable shutdown points for servicing.
• Maintenance shutdowns that demand a clear, lockable disconnect to ensure personnel safety and regulatory compliance.

What problems it solves

By providing a definitive, fused disconnect for all three lines, the THMC33 minimizes the risk of accidental re-energization during maintenance, helps enforce lockout/tagout protocols, and reduces downtime caused by unplanned electrical interruptions. The result is a safer work environment and more predictable maintenance windows.

Specifications at a glance

• Amperage rating: 100 A
• Number of poles: 3-Pole
• Product type: Fused Disconnect Switch
• Brand: General Electric
• Model: THMC33

Practical tips for maximum safety and performance

• Integrate with your facility’s lockout/tagout program to ensure controlled, verifiable energization and de-energization during maintenance.
• Pair with appropriately rated fuses to match circuit loads and protect downstream equipment from faults.
• Verify compatibility with your switchgear and control panels before installation to ensure a seamless fit and reliable operation.
• Schedule routine inspections to confirm clean contacts and proper enclosure integrity, preserving dependable disconnection under load.