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The non-current limiting breakers are designed for use in Siemens panels manufactured prior to 1968
Non-interchangeable
Mfr Brand Name: SQUARE D / Catalog No
New old stock SQUARE D QO370 3 pole 70 amp 240 volt plug in QO ser 2 breaker Square D New
Square D QOB280-1021 The non-current limiting breakers areQOB Bolt On Three pole thermal magnetic circuit breakers provide overcurrent protection and switching on AC and DC systems. Bolt on QOB circuit breakers are for use in NQOB and NQOD panelboards. QOB circuit breakers have an over center, trip free toggle mechanism with quick make, quick break action and positive handle indication. The tripping mechanisms in three pole circuit breakers operate such that an overcurrent on any pole of the circuit breaker