SQUARE D S33661 Shunt Trip S33661

Description:

The Square D S33661 Shunt Trip is a breaker accessory that allows remote electrical tripping of a circuit breaker via a control signal. Installed in industrial and commercial electrical distribution systems where remote shutdown, safety interlock, or emergency stop functionality is required. Electricians and maintenance teams use this shunt trip for replacement, retrofit, and safety system upgrades to provide remote breaker control.

Applications:

The Square D S33661 shunt trip is used in motor control centers, generator transfer switches, fire/safety shutdown circuits, and remote equipment protection systems where breakers must be tripped by an external control device such as a PLC, safety system, or building automation output. It supports emergency stop operations, automated safety shutdowns, and remote power isolation in industrial plants, commercial buildings, and critical infrastructure.

Technical Specifications:

• Manufacturer: Schneider Electric / Square D
• Model / Part Number: S33661
• Product Type: Shunt Trip Accessory
• Function: Remote electrical trip mechanism for compatible breakers
• Control Voltage: Typically 120 V AC (verify specific model rating)
• Compatibility: Works with specified Square D breaker frames that accept shunt trip accessories
• Operation: Electrically triggered trip coil
• Mounting: Installed on or wired into breaker accessory terminals
• Connection: Control signal input from remote switch or automation output
• Application: Remote breaker trip for safety and control systems

Common Replacements:

• Square D S33662 
• Square D 8881ST 
• Schneider Electric QO