140G-J0S3-D25 Allen‑Bradley Molded case switch

Description

140G-J0S3-D25 Allen‑Bradley Molded case switch

Product Dimensions：

Product Detailed Description

The Allen-Bradley 140G-J0S3-D25 is a Bulletin 140G Molded Case Switch (MCS) designed for reliable electrical isolation in industrial applications. It belongs to the J-frame series, offering a compact, high-performance solution for disconnecting power without automatic overcurrent protection. As a non-automatic switch (isolator), it features manual ON/OFF operation via a toggle handle and includes a magnetic override mechanism for self-protection against extreme fault currents (up to the device’s interrupting rating), but it does not provide circuit protection—upstream devices like fuses or breakers are required for that. This model is assembled as a complete unit (frame and internals not field-separable) and supports bolt-on mounting for secure integration into panelboards or switchboards. It is UL-listed (UL 489/CSA C22.2 No. 5) and IEC-compliant (IEC 60947-2/3), ensuring global compatibility and safety. Terminal lugs are not included and must be ordered separately for proper wiring.

Product Parameters

Product Advantages

• High Interrupting Capacity: With up to 200 kA at 240 V AC, it handles severe fault conditions effectively, reducing arc flash risks and enhancing system reliability in demanding environments.
• Compact and Versatile Design: J-frame size offers a small footprint (105 mm width for 3-pole) while supporting 250 A loads, ideal for space-constrained panels; bolt-on mounting ensures easy integration.
• Robust Isolation Performance: Provides reliable manual disconnect with magnetic self-protection (override at 200 A), minimizing downtime during maintenance; supports reverse feed and optional accessories like shunt trips or motor operators for remote control.
• Global Compliance and Durability: Meets UL, CSA, and IEC standards with a long mechanical life (25,000 operations), ensuring low maintenance costs; current-limiting options (available in J-frame) reduce let-through energy by half-cycle interruption.
• Customization Options: Field-installable accessories (e.g., auxiliary contacts, flange cable operators up to 3 m) allow tailored solutions; compatible with Rockwell Automation’s ecosystem for seamless integration in automation systems.
• Cost-Effective for Isolation: As a dedicated switch, it avoids unnecessary trip unit complexity, providing economic value for non-protection applications while maintaining high safety margins.

Precautions and Notes

• No Overcurrent Protection: This is an isolator only—do not use it as the sole protective device. Install upstream fuses or circuit breakers rated at or below 250 A to prevent overload or short-circuit damage to downstream equipment.
• Self-Protection Limitation: The magnetic override protects the switch from faults but may not open under all conditions; it does not safeguard the circuit. Test coordination with upstream devices during commissioning.
• Installation Requirements: Use only specified torque values (e.g., 36 N•m for terminals) and re-check after 24 hours. Employ Cu or CuAl conductors with appropriate lugs; avoid fine-stranded wire without crimps. No rear terminals available for J-frame.
• Environmental Considerations: Derate current above 40°C (e.g., 90% at 3000 m altitude). Ensure IP40 covers for finger-safe operation in polluted environments (Pollution Degree 3). Protect from excessive humidity or condensation.
• Operation and Maintenance: Manual toggle only—do not force operation. Lock-off capability is padlock-only (no lock-on). Perform periodic inspections per IEC 60947-1; accessories like shunt trips must be wired correctly to avoid false tripping.
• Safety Warnings: Follow NEC/CEC guidelines for reverse connections. Disconnect power before installation. Unauthorized modifications void certifications. Consult Rockwell Automation for counterfeit avoidance.

Product Applications

• Electrical Isolation in Industrial Panels: Ideal for disconnecting feeders or branches in switchboards, enabling safe maintenance without de-energizing entire systems.
• Motor Group Disconnects: Used as a manual isolator for motor control centers (MCCs), coordinating with upstream protection for group starting/stopping in manufacturing lines.
• Bus-Tie Applications: Provides reliable switching between bus sections in power distribution systems, supporting redundancy in critical infrastructure like data centers or utilities.
• Commercial and HVAC Systems: Serves as a service entrance disconnect or load isolator in building automation, handling 3-phase loads up to 250 A for pumps, fans, or compressors.
• Renewable Energy and Automation: Integrates into solar inverters or PLC-controlled setups for safe isolation during fault isolation or testing, leveraging accessories for remote operation.
• General Branch Circuit Isolation: Suitable for OEM panels in machinery where high interrupting capacity is needed for fault-prone environments, ensuring compliance with UL 508 for combined motor starters.

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