Protection Type Reference Chart

Reference Chart Protection Type Breaker Type Description Thermal-Magnetic Common Breaker A standard thermal-magnetic breaker protects a circuit from an overcurrent failure. Overcurrent failures can occur when the total amp draw of all devices currently running on a circuit is more than the circuit can safely supply. Thermal-Magnetic + Ground Fault Ground Fault Interrupter (GFI) / […]

Motor Control

What Controls a Motor? In 1887 Nikola Tesla invented an alternating current (AC) Motor to harness the power of electricity. It is a great invention but not as useful unless operators could turn the motor on and off. Therefore the “knife switch” was created, which connected the power to the motor when the operator manually pulled […]

Did Square D Go Out of Business?

Fun fact, Square D did not change its name until 1917, fifteen years after the company was established. The name change was due to the brand’s trademark “D” on conduit boxes and switches. Since then, Square D has been a leader and an innovative company in the electricity and automation management industry.     Square […]

Who Makes Siemens Breakers?

The simple answer is, of course, Siemens – they make their own well-known and durable breakers. Siemens has been around for over 150 years in engineering and world history in general. They have been making circuit breakers for a long time and are one of the top breaker manufacturers in the industry. Their simple design make […]

What Does BD1520 Breaker Mean?

BD1520 is an Eaton / Cutler Hammer brand miniature molded case circuit breaker. This breaker is a tandem / circuit limiting breaker. In other words, BD1520 is a double circuit breaker that takes up one circuit breaker space on a panelboard. However, it does not have a common trip or handle tie for simultaneous disconnecting of […]

Why Circuit Breakers Fail

Who doesn’t get a little frustrated when the power goes out every now and then? Especially when you’re in the middle of something. Circuit breakers seem to fail at the least opportune time. But why do circuit breakers fail anyway? First, let’s get back to the basics. We know that circuit breakers trip when there’s […]