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EKM8E Electronic adjustable type MCCB

EKM8E Electronic adjustable type MCCB
Technical Data

Product Overview

EKM8E and EKM8EL series electronic circuit breakers are applicable for low-voltage power systems of AC 50Hz, rated operating voltage up to 1000V and rated operating current from 16A to 800A.

Ambient and installation conditions

● Altitude up to 2000m;
● Ambient medium temperature should be within -10℃ to +55℃ ;
● It can withstand the effect of damp air;
● It can withstand the effect of salt fog or oil mist;
● It can withstand the effect of moulds;
● It can withstand the effect of nuclear radiation;
● The max inclination is 22.5℃.
● It still can work reliably when the ship subjects to normal vibration;
● It can still work reliably if the product subjects to the earthquake (4g).
● Places where the surrounding medium is free from explosion danger, and far away from gas or conductive dust that would erode the metal or destroy the insulation;
● Keep away from rain or snow.

Product Features

● Circuit breaker can be equipped with undervoltage release, shunt release, auxiliary contacts, alarm contacts, electric operating mechanism, rotary operating handle and other accessories.
● Circuit breaker has protection functions of overload long delay, short-circuit short delay and short-circuit
instantaneous protection, the user can set the required protection characteristics (user only needs to operate the DIP switch for settings of protection function parameters).
● Circuit breaker has ground fault and thermal analog protection functions, pre-alarm indication over-current
indication, load current indication, digital current analysis technology, and it can achieve a higher level of protection.
● EKM8EL series is circuit breaker with residual current protection function.

Panel and function description
Intelligent release panel

Panel adjustment knob as follows in turn:

● IR(A) Isd(x IR) Ii(x IR)
● IR: Overload long delay tripping setting current; Isd: Short-circuit short delay tripping setting current;
● Ii: Short-circuit instantaneous tripping setting current;

The rest parameters are set by factory default, or set by remote communication, as follows:

● tR: Overload long delay setting time, factory default: 60s;
● tsd: Short-circuit short delay setting time, factory default: 0.1s;
● Ip: Overload pre-alarm setting current, factory default: 0.85*IR;

Intelligent communication port (COM):

1:Power supply input DC24V(+)  6:485B-
2:Power supply input DC24V(-)  7:Closing and opening common terminal of electric operating mechanism
3:485A+ 8:Closing and opening common terminal of electric operating mechanism
4:485A+ 9:Opening of electric operating mechanism
5:485B- 10:Closing of electric operating mechanism

Panel With Residual Current Protection

1: Setting current In overload indicator, the red light will go on when the operation current is ≥ 105% In  
2: Pre-alarm current Ip indicator, the yellow light starts flashing when operation current is ≥ Ipx90%
3: When operation current is ≥ 60% xln setting current, the green light will go on
4: The code switch for residual current setting
5: The code switch for leakage action time setting

 Product Selection Guide

Product code Adjustable type Rated residual operating current
circuit breaker
E: electronic adjustable L: residual-current circuit breaker
Quick fixed type
Quick adjustable type
160 P 3
Code of frame size current Code of operating mode Pole number
P: electric operation
Z: rotary handle
W: direct operation
①Electric operation
3: 3-pole
4: 4-pole
400 2 A
Code of release type
and internal accessory
Code of different applications Code of four-pole product
2: intelligent release
Accessory code, see table 1
1: power distribution
2: motor protection
A: N-pole without protection, cannot close or open
B: N-pole without protection, can close and open  
C: N-pole with protection, can close and open
D: N-pole with protection, cannot close or open

Main Performance Indexes

Frame current (A) 160 250 400 630 800
Model EKM8Е-160H EKM8Е-250H EKM8Е-400H EKM8Е-630H EKM8Е-800H
Pole number 3, 4 3, 4 3, 4 3, 4 3, 4
Rated current (A) 16-32, 40-125,80-160 16-32,40-125,80-160,100-250 200-400 200-400,300-630 300-630,320-800
Rated voltage (V) AC400V
Rated insulation voltage (V) AC1000V
Short-circuit breaking capacity(KA)Icu/Ics AC400V 35/25 50/35 65/65 65/65 65/65
Operating cycle number Electrical life 1500 1000 1000 1000 1000
Mechanical life 7000 7000 4000 4000 4000

Outline dim(mm) a-b-c-ca

3P 90-155-88-115 105-165-88-115 140-257-103-155 140-257-103-155 210-257-103-155
4P 90-155-88-115 140-165-88-115 185-257-103-155 185-257-103-155 280-257-103-155
Weight (kg) 3P 1.8 2.1 5.5 5.7 5.7
4P 2.3 2.6 7 7.5 8.2
Electric operating device (MD)
External driving operating handle
Automatic release Electronic type

EKM8E Electronic adjustable type MCCB