Carling Technologies BB2-X0-10-208-521-D Circuit Breaker

Carling Technologies BB2-X0-10-208-521-D is a two-pole circuit breaker from Carling's BB2 family, rated for 20 A at up to 250 V AC and suitable for 50/60 Hz service. Identified by the exact part number BB2-X0-10-208-521-D, the device is a compact two-pole protection device that weighs about 0.30 lb. Distributor data confirms this model is discontinued by the manufacturer, which can affect availability and replacement considerations. Listings from US suppliers show stock in some channels, with examples indicating existing inventory and ongoing sourcing from multiple distributors. In operation, the two-pole configuration interrupts current on overload, providing protection for circuits that require simultaneous disconnection of both conductors. When selecting a replacement, ensure the new unit matches the BB2-X0-10-208-521-D’s specifications: two poles, 20 A rating, and 250 V AC rating, with compatible mounting and terminal arrangements to fit your panel or enclosure.