Siemens B330 Miniature Circuit Breaker

This breaker is engineered specifically for Siemens Type BL panelboard applications, including the P1, P2, P3, P4, and P5 series enclosures. It features a bolt-on design and will not fit in standard plug-on load centers.

Yes, Siemens continues to manufacture these breakers to the same physical dimensions as the legacy hardware. The B330 serves as a direct, UL listed replacement for legacy ITE B330 breakers. It is also commonly cross-referenced as catalog number BL330.

Yes, this thermal-magnetic circuit breaker is HACR rated, meaning it is certified to handle the specific inrush currents associated with heating, air conditioning, and refrigeration equipment.

The B330 is calibrated for continuous operation in a standard ambient temperature of 40 degrees Celsius (104 degrees Fahrenheit).

Yes, the integrated terminal lugs are dual-rated for both copper and aluminum conductors. The acceptable wire size range is 10 to 8 AWG for copper and 10 to 6 AWG for aluminum.

No, the B330 mounts directly to the bus structure of compatible Siemens panelboards using its integrated bolt-on connectors. No additional mounting kits or hardware are required.

No, this breaker features a fixed thermal-magnetic trip unit. It provides preset long-time overload and instantaneous short-circuit protection that cannot be field adjusted.

Yes, the three poles are internally and mechanically linked. An overload or fault condition on any single phase will automatically trip all three poles simultaneously to protect three-phase motors and equipment from single-phasing.

Yes, this circuit breaker is suitable for reverse feed applications. It can be back-fed for use as a main breaker, provided the installation complies with your local electrical codes and panelboard guidelines.