Siemens BOS14321 - 30A, 240V, Fusible, Switch

The Siemens BOS14321 is a rugged, 30A, 240V fusible disconnect switch designed for reliable on/off isolation and built-in overcurrent protection in demanding industrial and commercial environments.

Why choose the BOS14321 fusible disconnect switch

• Built-in overcurrent protection — the fused design provides immediate protection for motors, feeders, and downstream equipment, reducing the need for additional fusing in tight spaces.
• Compact and maintainable — a robust switch that fits into tight panels and allows straightforward fuse replacement and servicing without de-energizing other parts of the system.
• Reliable Siemens engineering — designed for continuous duty in harsh industrial and commercial settings, with consistent performance and clear isolation when needed.

Ideal applications

• Motor disconnects in commercial or light industrial equipment where safe isolation is required for maintenance or service work.
• Panelboards needing a dedicated, mounted disconnect with built-in protection.
• Branch circuits that demand straightforward, code-compliant protection and quick shutoff.

Key specifications

• Model: BOS14321
• Amperage: 30A
• Voltage: 240V
• Fusible: Yes — Fusible switch for selective protection

What to expect in real-world use

In a busy electrical panel or motor control center, the BOS14321 provides a safe, clearly visible isolation point that also protects circuit conductors from overcurrent events. When the load needs to be serviced, simply operate the switch to the off position to ensure a secure, mechanical break in the circuit, while the fused element absorbs surge energy and protects downstream devices.

Maintenance and best practices

• Use the correct fuse type and rating compatible with the BOS14321 to maintain protection levels.
• Before replacing fuses, follow lockout/tagout procedures and verify the circuit is de-energized.
• Periodic visual checks for fuse integrity and switch operation help maintain reliability in ongoing service environments.