MCCB and MCB as terms

MCCB stands for "Molded Case Circuit Breaker." This is defined in the IEC standard, IEC 60947-2 and in the UL standard, UL 489. MCB stands for "Miniature Ci... More Details >>

Leakage characteristics

Type AC: Operates with AC Type A: Operates not only with AC but also with pulsating current <Reference> TYPE B: Operates with DC More Details >>

Setting change operation while power is on

It is forbidden to change the characteristic when the breaker ON. Over current trip and earth leakage trip characteristics should be changed by a person with... More Details >>

MCCB bar terminal material

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

Release element in neutral (4P breaker)

AE-SW 4-poles with WS relay (general protection) has overcurrent protection for neutral-pole. The tripping characteristic is same as phase-pole. Moreover, A... More Details >>

Where UVT power supplied from?

Do not take the control power supply of UVT ("Resettable type" and "Reset prevention type") from the secondary side of the breakers. If taking the control po... More Details >>

ACB　General use Generator protection use

General protection relay (WS) of AE-SW type Air Circuit Breaker has tripping characteristic and function for general use. However, we also provide the replay... More Details >>

Change Electronic relay characteristics when it is energized

Only electricians who have enough technical knowledge should change the setting of overcurrent tripping and earth leakage tripping characteristics. Moreover,... More Details >>

Operation handle CE marking

The operating handle is an external accessory for a circuit breaker and there is no safety standard for the operating handle itself. Therefore, there is no C... More Details >>

ELCB High-sensitivity

It is the Earth Leakage Circuit Breaker with rated residual operating current of 30mA or less. More Details >>