THQB21100ST1 - 100Amp Circuit Breaker

THQB21100ST1 - 100 Amp Circuit Breaker

The THQB21100ST1 is a 100 Amp, 2-pole molded case circuit breaker designed for dependable circuit protection in your commercial, industrial, and institutional electrical distribution systems. As part of the trusted THQB Q-Line series, this bolt-on circuit breaker provides secure panelboard installation while delivering reliable overcurrent and short-circuit protection for 120/240VAC applications. Equipped with a 120VAC shunt trip, the breaker can be remotely tripped from an external control signal, making it a practical choice for emergency shutdown systems, fire safety integration, access control systems, and other applications that require remote disconnect capabilities. Its compact footprint and proven design help support safe operation while minimizing downtime in demanding electrical environments.

Key Features and Benefits

• 100 Amp Rating: for higher-capacity branch circuit and feeder protection.
• 2-Pole Configuration: designed for 120/240VAC electrical systems.
• 120VAC Shunt Trip: enables remote breaker operation and emergency disconnect functionality.
• Bolt-On Mounting Design: helps ensure a secure and stable connection within compatible panelboards.
• 10kA Interrupting Capacity (A.I.C.): at 120/240VAC for dependable fault-current protection.
• Q-Line Series Construction: recognized for reliable performance in commercial and industrial installations.
• HACR Rated: for use in heating, air conditioning, and refrigeration applications where permitted by code.
• Molded Case Design: provides durable protection for electrical distribution systems.

Technical Specifications

• Part Number: THQB21100ST1
• Type: THQB
• Circuit Breaker Style: Molded Case Circuit Breaker
• Mounting: Bolt-On
• Poles: 2
• Amperage: 100A
• Voltage Rating: 120/240VAC
• Interrupting Capacity: 10kA @ 120/240VAC
• Shunt Trip Voltage: 120VAC
• HACR Rated: Yes
• Product Series: Q-Line
• Height: 3.5 in.
• Width: 3.0 in.
• Depth: 2.81 in.

Material Compliance and Certifications

• The THQB21100ST1 is manufactured and tested to meet applicable industry standards for molded case circuit breakers. Its HACR rating supports use in approved heating, ventilation, air conditioning, and refrigeration applications. Always verify installation requirements and local electrical codes to ensure proper application and compliance.

Where It Works Best

• The THQB21100ST1 is well suited for commercial buildings, industrial facilities, schools, healthcare environments, office complexes, and critical infrastructure applications where dependable overcurrent protection and remote tripping capabilities are required. It is particularly useful in systems that incorporate emergency power-off circuits, fire alarm interfaces, safety shutdown controls, HVAC equipment, and automated building management systems, providing both protection and operational flexibility.