A coordinated starter is a system, not three ratings An overload relay, contactor and short-circuit protective device (SCPD) do different jobs in a motor starter. The overload relay responds to...Read More
Choose the starting method around the load, not only motor kW DOL, star-delta and soft starting all bring a motor up to speed, but they do it in different ways....Read More
Selectivity and cascading solve different problems Selectivity aims to keep a fault local by allowing the protective device closest to the fault to operate without unnecessarily opening an upstream device....Read More
Running current is only part of the starter duty A motor starter can carry a motor continuously and still be unsuitable for the way a machine actually operates. Frequent starts,...Read More
What is the difference between a 3-pole and 4-pole MCCB? A 3-pole MCCB switches and protects the three phase conductors. A 4-pole MCCB also switches the neutral, but the neutral...Read More
What is the difference between Type AC, A, F and B RCCBs? RCCB type selection should begin with the residual-current waveform that the connected equipment is capable of producing. Type...Read More
