MCCB, ELCB and ACB at higher altitudes

In that case, the rated current and the rated voltage shall be reduced. Refer to the table of derating factors as below. More Details >>

2P MCCB only 1-pole use

No, you must not use 2-pole circuit breaker as 1-pole circuit breaker (series connection as only single phase ). If using it as 1-pole circuit breaker, these... More Details >>

MCCB bar terminal material

Bar terminal material for 400A is aluminum alloy, and for 630A or higher is copper. More Details >>

ACB DC use

It is not possible to use standard AE-SW in DC circuit. Special DC use AE-SW is provided if specified. More Details >>

UL ELCBs Reverse connection

It is possible to reverse-connect if the circuit voltage of UL789 listed products is AC240V or less. Since they are double standard products of UL/CSA and CE... More Details >>

Short circuit current calculation software

You can calculate that with MELSHORT 2 (Free of charge). More Details >>

Inverse time delay operating characteristic

It is a characteristic that operating time inversely become shorter as current increases. For Molded Case Circuit Breakers, protection characteristic meeting... More Details >>

Arc space

It means a space between the edge of a exhaust port and panel component ( such as wall or duct) of a circuit breaker. The arc space is needed for smoothly di... More Details >>

Rating of a circuit breaker for transformers primary protection

When making a transformer to energize, a large inrush current may flow. The circuit breaker is therefore required to prevent unwanted trip. The selection of ... More Details >>

Operating cycles

It is the number that can be opened/closed per hour under the conditions specified in the standard. More Details >>