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 >>

IEC60947-2 standard

IEC 60947-2 is an international standard for circuit breakers. The rated voltage for the applicable circuit breaker is 1000V AC or less, or DC 1500V DC or le... More Details >>

Horizontal allowable distance when installing ACB

Flatness of mounting plane: 1 mm or less.In addition, it is necessary to consider the horizontality of the panel. More Details >>

ELCB Default setting Time-delay type sensitivity

Both of the adjustment knob is set to the maximum value when shipping in order to prevent unwanted earth leakage tripping when Earth Leakage Circuit Breaker ... More Details >>

Ambient temperature

The range of ambient temperature is from -10 to 40 degree Celsius for not only MCCB but also including Earth Leakage Circuit breaker, Earth Leakage Relay and... More Details >>

Lifetime with SHT or UVT

The number of trip durability by using SHT and UVT is 10% of the opening/closing number including the number of trips by overcurrent, trip button and test bu... More Details >>

Short circuit current calculation software

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

ELCB High-sensitivity

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

PAＬ（Pre-Alarm Module）

Pre-Alarm is a function which outputs an alarm if the load current exceeds setting current value. This is useful for securing continuous power supply and pre... More Details >>

High inst MCCB for transformer primary side

It is a circuit breaker which has higher instantaneous tripping current value in order to prevent unwanted tripping by magnetizing inrush current of a transf... More Details >>