Square D 999270 Circuit Breaker
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Core Specs
See full specsSquare D 999270 2 Pole Circuit Breaker
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Description
Square D 999270 2 Pole Circuit Breaker
The Square D 999270 is a 2 Pole thermal magnetic molded case circuit breaker with a current rating of 70 Amps and a voltage rating of 600VAC. It has an interrupting rating of 10kAIC at 600V. The 999270 has a bolt-on connection type and includes long time and instantaneous trip functions.
Specifications
Product FAQs
5 answersWhat are the installation requirements for the 999270 breaker?
As a bolt-on breaker, it must be mechanically fastened directly to the panel busbar. Ensure the panel is de-energized before installation and torque the mounting bolts to the manufacturer specifications to prevent arcing or overheating.
How does the thermal magnetic trip unit function on the 999270?
The thermal magnetic mechanism provides dual protection. The long time thermal element responds to sustained overloads by heating a bimetallic strip, while the instantaneous magnetic element responds immediately to high fault currents or short circuits.
How is a 2 pole breaker like the 999270 utilized in a 3 phase system?
A 2 pole breaker can be installed in a 3 phase panel by connecting it across two of the three available phases. This configuration is typically used to supply 600VAC single phase loads from a 3 phase source.
Is the Square D 999270 still in active production?
No, the 999 series frame is discontinued by the manufacturer. It is typically sourced as a direct replacement part to maintain existing electrical infrastructure without requiring a complete panel upgrade.
What safety considerations apply when replacing a 999 series breaker?
Always verify that the panel is completely de-energized before attempting to remove or install a bolt-on breaker. Confirm that the 10kAIC rating meets or exceeds the available fault current at the installation point to ensure safe operation during a short circuit.
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