Square D QMB30R 30A 3P 600V Safety Switch, Fusible | AmpState

The Square D QMB30R is a fusible, three-pole safety switch engineered for everyday electrical work. Designed for equipment disconnect and isolation at the point of use, this 30 A, 3P, 600 V unit delivers reliable protection where you need clean power shutoff and quick, safe maintenance access. It’s a smart pick for workers who value a direct part-number match and dependable performance in the field.

• Amperage: 30 A
• Poles: 3
• Voltage rating: 600 V
• Fusible: Fusible safety switch for integrated overcurrent protection
• Manufacturer: Square D
• Part Number: QMB30R

Ideal for maintenance teams, panel builders, and spare-inventory strategies where a direct part-number match matters, the QMB30R combines straightforward installation with robust safety features. Use it to disconnect and isolate equipment at the point of use in three-phase systems, motors, drives, and control panels where predictability and rapid fault isolation are essential.

What makes the QMB30R stand out

• Integrated protection and isolation: A fusible disconnect switch that provides both ground-breaking isolation and immediate overcurrent protection in one compact unit.
• Three-phase readiness: 3-pole configuration tailored for balanced three-phase circuits common in manufacturing and industrial setups.
• Industry-standard reliability: Square D’s engineering lineage offers consistent performance and compatibility with common control environments.
• Easy procurement: Available from AmpState, with support to verify fit and compatibility for your exact installation.

If you’re unsure about fit, AmpState offers assistance to confirm compatibility with your panel or system—just send a quick note and we’ll help verify that QMB30R is the right match for your application. Consider these practical tips when planning installation: verify the fuse type and rating required for your load, ensure the circuit voltage does not exceed 600 V, and follow all local electrical codes during wiring and maintenance.

Who should consider the QMB30R? Teams responsible for reliable equipment shutdowns, control panel fabricators seeking a proven fusible disconnect, and facilities with spare parts inventory that benefits from consistent part-number alignment. In short, it’s a purpose-built solution for safe, efficient disconnection in three-phase, high-voltage environments.